Gardening calculators
Start with the Raised Bed Soil Calculator hub, then open related calculators for your project.
- Mulch Calculator
- Compost Calculator
- Topsoil Calculator
- Garden Soil Calculator
- Gravel Calculator
- Plant Spacing Calculator
Find BMI, payroll, mortgage, tip, percentage, and salary calculators in one place. Every tool runs locally in your browser—nothing is uploaded.
Browse by project — gardening, landscaping, cooking, electrical, and home improvement calculators with cross-linked workflows.
Start with the Raised Bed Soil Calculator hub, then open related calculators for your project.
Start with the Sod Calculator hub, then open related calculators for your project.
Start with the Recipe Scaler Calculator hub, then open related calculators for your project.
Start with the Wire Gauge Calculator hub, then open related calculators for your project.
Open Wire Gauge CalculatorStart with the Paint Calculator hub, then open related calculators for your project.
Start with the Roofing Shingle Calculator hub, then open related calculators for your project.
Start with the Pipe Volume Calculator hub, then open related calculators for your project.
Start with the BTU Room Calculator hub, then open related calculators for your project.
Find BMI, payroll, mortgage, tip, percentage, and salary calculators in one place. Every tool runs locally in your browser—nothing is uploaded.
Online calculators solve common math, finance, health, and everyday problems—from percentages and discounts to BMI, work hours, and salary estimates—with instant, copyable results.
Online calculators are simple tools that turn a question into a clear numeric answer. Instead of doing manual arithmetic (and risking mistakes), you enter inputs and get a result instantly—often with breakdowns, formulas, and practical interpretations.
This calculators hub helps you find the right calculator quickly—whether you're calculating tips, discounts, percentages, BMI, GPA, work hours, overtime, or salary estimates.
Estimate daily calories using the Mifflin-St Jeor BMR formula and TDEE activity multipliers for maintenance, weight loss, or weight gain. Runs locally in your browser when supported—no upload required for normal use.
Free tip calculator — find tip amount, bill + tip total, and per-person share. Presets for common percentages (10%, 15%, 20%), custom %, and equal split. Runs in your browser. No signup.
What is 20% of 500? Percent increase, decrease, difference, reverse %, markup & margin—runs locally in your browser, no upload. Copy results or share a link.
Age gap or date duration in years, months, and days. Two modes, timeline, presets, copy & share—free, runs locally in your browser.
Age gap or date duration in years, months, and days. Two modes, timeline, presets, copy & share—free, runs locally in your browser.
Free average calculator: arithmetic mean, sum, count, min, max, and range from pasted lists—grades, budgets, or datasets. Private, instant, no signup. Runs locally in your browser when supported—no upload required for normal use.
Estimate bi-weekly gross and net pay from hourly rate, hours, overtime 1.5×/2×, and tax %. No upload—runs in your browser. Planning only, not official withholding.
Calculate BMI from height and weight using metric or imperial units. See BMI category ranges and use it as a quick screening estimate. Runs locally in your browser when supported—no upload required for normal use.
Estimate body fat % with US Navy waist/neck/hip measurements or BMI method. Runs locally in your browser—never uploaded. Free for men and women.
Free break-even calculator — find break-even units and revenue from fixed costs, price, and variable cost. Includes contribution margin and targets. No signup. Runs locally in your browser when supported—no upload required for normal use.
Estimate daily calories using the Mifflin-St Jeor BMR formula and TDEE activity multipliers for maintenance, weight loss, or weight gain. Runs locally in your browser when supported—no upload required for normal use.
Free charity calculator for donation budgeting: percent-of-income or fixed gifts, formula breakdown, scenario table, gross/net basis. Browser-local — not tax advice.
Calculate combinations nCr = n!/(r!(n−r)!) for unordered selections. No upload: runs locally in your browser. Free, instant nCr results.
Free cost of living calculator — compare two cities and estimate equivalent salary using cost indices (and optional category weights). Runs locally. No signup.
Calculate net work hours for one shift from clock-in, clock-out, and breaks. Decimal output for timesheets. No upload—runs locally in your browser.
Calculate sale price and savings from percent or fixed discounts. Reverse original price too. No upload—runs locally in your browser. Free.
Free electricity cost calculator: kWh = (watts ÷ 1000) × hours; cost = kWh × your $/kWh rate—stack appliances, peak/off-peak. Runs in your browser, no signup.
Calculate powers like a^b, negative exponents, and fractional exponents with clear results and quick examples like 2^3 = 8. Runs locally in your browser when supported—no upload required for normal use.
Calculate factorial n! for 0 ≤ n ≤ 500 with exact big-integer results. No upload—runs locally in your browser. Free, instant n! for combinatorics.
Free fraction calculator with steps: add, subtract, multiply, divide, simplify, and show mixed/decimal forms instantly. Fast, private, no signup. Runs locally in your browser when supported—no upload required for normal use.
Free freelance rate calculator — turn target income, business expenses, tax, and billable hours into a minimum hourly rate, with optional profit buffer and project price. No signup. Runs locally in your browser when supported—no upload required for normal use.
Free fuel cost calculator: trip fuel = distance ÷ MPG (or km × L/100km ÷ 100) × price per gallon or liter—round trip & buffer optional. Private, no signup. Runs locally in your browser when supported—no upload required for normal use.
Find the greatest common factor of two or more integers using the Euclidean algorithm and factor-method explanations. Runs locally in your browser when supported—no upload required for normal use.
Free gold zakat calculator: weight, karat, 24k price—85g nisab & 2.5% if above threshold. Runs locally in your browser; never uploaded. Estimate only.
Calculate weighted GPA from letter grades and credit hours. Standard 4.0 formula, instant results. No upload—runs locally in your browser. Free, no signup.
Free heart rate zone calculator: Karvonen or 220−age, five zones in bpm—fat burn, cardio, threshold, HIIT. Runs locally; never uploaded.
Convert hourly wage to daily, weekly, monthly & yearly gross pay. Overtime 1.5×, job compare, tax estimate. No upload—runs locally in your browser. Free.
Estimate ideal weight using Devine, Robinson, Miller, and Hamwi formulas and compare the output range in one place. Runs locally in your browser when supported—no upload required for normal use.
Calculate the least common multiple of two or more integers with formula-based steps and prime factorization guidance. Runs locally in your browser when supported—no upload required for normal use.
Calculate lean body mass from body fat % or Boer, James, and Hume formulas. Runs locally in your browser—never uploaded. Free LBM & BMR estimates.
Free logarithm calculator: log base 10, natural log (ln), log₂, or any custom base b for positive x. Runs in your browser—never uploaded.
Estimate daily macros from BMR and TDEE, then split calories into protein, carbs, and fats for fat loss, maintenance, or muscle gain. Runs locally in your browser when supported—no upload required for normal use.
Free meal cost calculator: unit-labeled ingredients, waste %, weekly meal plan, food-cost target & CSV export. Runs locally—never uploaded.
Compare mean, median, and mode from one dataset. See how each central-tendency measure describes your numbers when outliers or skew matter. Runs locally in your browser when supported—no upload required for normal use.
Free monthly budget calculator — track income and categorized expenses to see surplus/deficit and 50/30/20 splits. Plan savings targets. No signup. Runs locally in your browser when supported—no upload required for normal use.
Free monthly work hours calculator: sum decimal weekly totals or estimate 8×5×4.33 h. Month-end hours for timesheets—runs locally, never uploaded.
Fast keyboard-friendly calculator for +, −, ×, ÷, %, and parentheses. No upload—runs locally in your browser. Free, instant results.
Calculate overtime pay at 1.5× or 2×: enter hourly rate, regular hours, and OT hours for gross weekly pay. Runs locally in your browser—never uploaded. Free.
Estimate ovulation day and fertile window from last period date and cycle length. Calendar + 3-cycle forecast. Runs locally in your browser—never uploaded. Free.
What is 20% of 500? Percent increase, decrease, difference, reverse %, markup & margin—runs locally in your browser, no upload. Copy results or share a link.
Calculate permutations nPr = n!/(n−r)! when order matters—5P2, 10P3, 26P3 & more. Runs locally in your browser, no upload. Exact results up to n=500.
Estimate pregnancy due date from the first day of your last menstrual period (LMP) with a simple 40-week calculation. Runs locally in your browser when supported—no upload required for normal use.
Six modes: check, factor tree, list, range, nth, random. Sieve animation, Miller–Rabin to 10¹², export TXT/CSV—runs locally.
Calculate P(A), complements, P(A and B), and P(A or B) for independent events. No upload—runs locally in your browser. Free, instant.
Free profit margin calculator — compute profit, margin %, and markup from cost and selling price, or find price for a target margin. Runs locally. No signup.
Estimate daily protein requirements based on body weight, activity level, and fitness goal. Results in grams per day and per meal. Runs locally in your browser when supported—no upload required for normal use.
Free ratio calculator & ratio solver — simplify ratios (12:18 → 2:3), compare equivalence, simplify aspect ratios (1920×1080 → 16:9). Runs locally; data stays on your device.
Free raised bed soil calculator with mix splits (60/40, Mel's Mix), round & rectangular beds, bulk vs bag guidance, weight estimates, cubic yards, and bag counts. Runs locally in your browser.
Free mulch calculator: bed size or square footage and depth → cubic yards, cubic feet, liters, and bag counts. Depth presets, coverage tables, optional buffer. Imperial or metric. Runs locally in your browser.
Free compost calculator: bed or area and depth → cubic yards, cubic feet, liters, and bag counts for amendments and top-dressing. Depth presets and optional buffer. Runs locally in your browser.
Free topsoil calculator: lawn or bed dimensions and fill depth → cubic yards, cubic feet, liters, and bags. Leveling and new bed presets. Runs locally in your browser.
Free garden soil calculator: bed fill volume for blended soil mixes — cubic yards, cubic feet, liters, and bag counts. Imperial or metric. Runs locally in your browser.
Free gravel calculator: path or driveway area and depth → cubic yards, cubic feet, and bag estimates with compaction buffer. Runs locally in your browser.
Free plant spacing calculator: bed size and row/plant spacing → total plants for grid layouts. Tomato, lettuce, and square-foot presets. Runs locally in your browser.
Free grass seed calculator: lawn area and seeding rate → pounds or kilograms of seed with optional buffer. New lawn and overseed presets. Runs locally in your browser.
Free sod calculator: lawn area and pallet size → pallets and rolls to order. Lawn presets, trim buffer, sq ft per pallet from your farm tag. Imperial or metric. Runs locally in your browser.
Free landscape rock calculator: bed size or tree ring and depth → cubic yards, ton estimates, bags, and bulk vs bag guidance. River rock presets, round bed mode, order buffer. Runs locally in your browser.
Free paver calculator: patio area, paver size, and cut waste → paver count, boxes, and pallets. Backyard patio presets, ICPI waste guidance, imperial or metric. Runs locally in your browser.
Free sand calculator: patio footprint and bedding depth → cubic yards, bags, and bulk vs bag guidance. Paver bedding presets, round patio mode, order buffer. Imperial or metric. Runs locally in your browser.
Free gravel depth calculator: path or pad footprint and layer depth → cubic yards, bags, and coverage tables. Walkway, driveway, and paver base presets with compaction buffer. Imperial or metric. Runs locally in your browser.
Free French drain calculator: trench length, width, and fill depth → cubic yards and bags of drain rock. Foundation and downspout presets, 12–24 in depth guide, order buffer. Imperial or metric. Runs locally in your browser.
Free retaining wall block calculator: wall length, height, and block size → blocks to order, courses per row, and cut buffer. Garden terrace presets for 16×8 in blocks. Imperial or metric. Runs locally in your browser.
Free landscape fabric calculator: bed area and sq ft per roll → rolls to buy with overlap buffer. Shrub border and path edge presets. Imperial or metric. Runs locally in your browser.
Free paint calculator: enter wall area, coverage from your can, and coats → gallons or liters to buy. Room presets, door/window deductions, waste buffer, can round-up. Runs locally in your browser.
Free flooring calculator: room size + sq ft per box → cartons to buy with waste buffer. LVP and laminate presets, 10–20% waste, imperial and metric. Runs locally in your browser.
Free wallpaper calculator: room size, roll dimensions, and pattern repeat → rolls to buy. Room and accent-wall presets, waste buffer. Runs locally in your browser.
Free tile calculator: floor area + tile size → tiles and boxes to buy with waste buffer. Bath and kitchen presets, 10–15% waste, imperial and metric. Runs locally in your browser.
Free drywall calculator: room size + wall height → 4×8 sheet count with door/window deductions and waste buffer. Bedroom and basement presets. Runs locally in your browser.
Free concrete calculator: slab footprint + depth → cubic yards and bag counts. Patio, sidewalk, and post-hole presets with ready-mix guide. Runs locally in your browser.
Free carpet calculator: room size + roll width → square yards and linear feet with seaming waste. Bedroom and living presets, 12 ft roll width. Runs locally in your browser.
Free insulation calculator: area + sq ft per batt bag → bags to buy with waste buffer. Attic, wall, and crawl presets with opening deductions. Runs locally in your browser.
Free fence calculator: run length or yard perimeter → panels and posts with waste buffer. Wood and vinyl 8 ft presets. Runs locally in your browser.
Free roofing shingle calculator: roof area and sq ft per bundle → bundles to order with waste buffer. Roof size presets, 33.3 sq ft bundle default. Runs locally in your browser.
Free roof pitch calculator: rise and run → pitch ratio (X/12), angle in degrees, and footprint area multiplier. Residential pitch presets. Runs locally in your browser.
Free roof area calculator: building footprint and pitch → total roof surface sq ft. Rectangle or area input with slope multiplier. Runs locally in your browser.
Free metal roofing calculator: roof area and sq ft per panel → panel counts with waste buffer. Standing seam presets. Runs locally in your browser.
Free gutter calculator: eave length or perimeter → linear feet and 10 ft section counts with overlap buffer. Runs locally in your browser.
Free fascia calculator: eave run → linear feet and 12 ft board counts with cut waste buffer. Runs locally in your browser.
Free soffit calculator: eave length and soffit depth → sq ft to cover with optional 4×8 sheet counts. Runs locally in your browser.
Free roofing material calculator: roof area → shingle bundles and underlayment rolls with waste buffer. Full takeoff presets. Runs locally in your browser.
Free pipe volume calculator: inside diameter and length → gallons, liters, and water weight in the pipe. Imperial and metric. Runs locally in your browser.
Free drain slope calculator: horizontal run and slope in/ft → total drop and percent grade with IPC minimum check. Runs locally in your browser.
Free water heater calculator: household size → tank gallon size or tankless GPM and BTU/hr. Tank and tankless modes. Runs locally in your browser.
Free pipe sizing calculator: fixture counts → WSFU and DFU totals with supply and drain pipe size recommendations. Runs locally in your browser.
Free PEX pipe calculator: run length or perimeter → linear feet and coil counts with fittings buffer. Runs locally in your browser.
Free septic tank calculator: bedrooms or occupants → recommended tank gallons with daily flow estimate. Runs locally in your browser.
Free sump pump calculator: basement sq ft and head height → recommended GPM capacity with heavy-rain margin. Runs locally in your browser.
Free hot water flow calculator: simultaneous fixtures → peak GPM and tankless BTU/hr at your temperature rise. Runs locally in your browser.
Free BTU room calculator: floor area, ceiling height, climate zone → cooling BTU/hr, tons, and suggested CFM. Runs locally in your browser.
Free AC tonnage calculator: room size and climate → central air conditioner tons from cooling BTU load. Runs locally in your browser.
Free furnace BTU calculator: room or whole-home sq ft → recommended heating BTU/hr output by climate zone. Runs locally in your browser.
Free heat pump size calculator: room dimensions → tons with cooling and heating BTU/hr estimates. Runs locally in your browser.
Free duct CFM calculator: AC tonnage or cooling BTU → required supply airflow using 400 CFM per ton. Runs locally in your browser.
Free duct size calculator: CFM and velocity → round duct diameter with next standard size. Runs locally in your browser.
Free window AC cost calculator: watts, hours per day, and $/kWh → monthly or seasonal electricity cost. Runs locally in your browser.
Free space heater cost calculator: heater watts and daily use → kWh and operating cost at your electric rate. Runs locally in your browser.
Free recipe scaler: original and new servings → scale factor and ingredient amounts. Double, halve, or custom serving math. Runs locally in your browser.
Free baking conversion: cups and tablespoons to grams for flour, sugar, butter, and more. Ingredient-specific densities. Runs locally in your browser.
Free cake pan converter: rectangular and round pans → area ratio and batter scale factor. Swap 9×13 for 8×8 or round tins. Runs locally in your browser.
Free turkey serving calculator: guest count and lb per person → total turkey weight to buy, with optional leftovers buffer. Runs locally in your browser.
Free rice ratio calculator: cups of rice and water-to-rice ratio → cups of water to add. White, jasmine, brown, and basmati presets. Runs locally in your browser.
Free yeast converter: swap active dry, instant, and fresh yeast by potency — 2 tsp active dry → 1.5 tsp instant. Runs locally in your browser.
Free oven temperature converter: Fahrenheit, Celsius, and UK gas mark for baking — 350°F → 177°C, Gas 4. Runs locally in your browser.
Free meat thaw calculator: frozen weight → refrigerator or cold-water thaw hours — 12 lb turkey ≈ 57.6 hours (~2.4 days) in the fridge. Runs locally in your browser.
Free brine calculator: water gallons and salt % → grams and cups of salt — 1 gallon at 5% ≈ 189 g salt. Runs locally in your browser.
Free pizza dough calculator: split total dough into equal balls or compute from flour and hydration — 1000 g ÷ 4 = 250 g per ball. Runs locally in your browser.
Free wire gauge calculator: load watts or amps → minimum copper AWG with continuous-load sizing. 60°C NM-B ampacity reference. Pair with breaker and voltage drop tools. Runs locally in your browser.
Free circuit load calculator: sum appliance watts on one breaker → amps and load percentage. 80% guidance for continuous loads. Runs locally in your browser.
Free breaker sizing calculator: load watts and voltage → standard breaker size and minimum copper wire. Continuous-load factor included. Runs locally in your browser.
Free voltage drop calculator: amps, AWG, and run length → percent voltage loss. Extension cord and branch-circuit checks. Runs locally in your browser.
Free running pace calculator: pace, finish time, or distance from any two values. Min/km & min/mile, race presets, splits—runs locally in your browser, never uploaded.
Estimate take-home pay from salary using simplified tax brackets and standard deductions (US/UK/CA/AU + custom). Shows effective and marginal rates. No signup. Runs locally in your browser when supported—no upload required for normal use.
Convert salary to hourly, daily, weekly, and monthly pay using the 2,080-hour baseline, then adjust for weekly hours and PTO for a true hourly rate. No signup. Runs locally in your browser when supported—no upload required for normal use.
Use a scientific calculator for trigonometry, logarithms, powers, roots, and constants with DEG/RAD support and instant browser-based results. Runs locally in your browser when supported—no upload required for normal use.
Find the best bedtime or wake-up time based on 90-minute sleep cycles. Minimize sleep inertia by waking at the end of a cycle. Runs locally in your browser when supported—no upload required for normal use.
Calculate square roots, cube roots, and nth roots with decimal precision and simplified radical form for integers. Runs locally in your browser when supported—no upload required for normal use.
Calculate population or sample standard deviation, see variance, and understand dataset spread with a simple variance-to-standard-deviation workflow. Runs locally in your browser when supported—no upload required for normal use.
Convert steps to km or miles using step length, height, or averages. Reverse mode included—free, runs locally in your browser.
Split total study hours across subjects, weeks, and study days. No upload—runs locally in your browser. Free exam planning, no signup.
Free time-and-a-half calculator — enter your regular hourly rate and overtime hours to calculate pay at 1.5× rate. Instant results for payroll and wage verification. No signup. Runs locally in your browser when supported—no upload required for normal use.
Free tip calculator — find tip amount, bill + tip total, and per-person share. Presets for common percentages (10%, 15%, 20%), custom %, and equal split. Runs in your browser. No signup.
Free unit price calculator: divide price by quantity to compare cost per unit across package sizes. Private, instant, no signup. Runs locally in your browser when supported—no upload required for normal use.
Estimate daily hydration using a weight-based formula with activity adjustments, then view results in liters, cups, and milliliters. Runs locally in your browser when supported—no upload required for normal use.
Calculate net work hours from clock-in, clock-out, and unpaid breaks—decimal output for timesheets. No upload: runs locally in your browser. Free.
Estimate zakat from cash, metals, and assets minus short-term debts—nisab via 85g gold or 595g silver × your price per gram, then 2.5% if due. Rules vary. No signup. Runs locally in your browser when supported—no upload required for normal use.
Estimate zakat from cash, metals, and assets minus short-term debts—nisab via 85g gold or 595g silver × your price per gram, then 2.5% if due. Rules vary. No signup. Runs locally in your browser when supported—no upload required for normal use.
Calculate net work hours from clock-in, clock-out, and unpaid breaks—decimal output for timesheets. No upload: runs locally in your browser. Free.
Estimate daily hydration using a weight-based formula with activity adjustments, then view results in liters, cups, and milliliters. Runs locally in your browser when supported—no upload required for normal use.
Free unit price calculator: divide price by quantity to compare cost per unit across package sizes. Private, instant, no signup. Runs locally in your browser when supported—no upload required for normal use.
Free tip calculator — find tip amount, bill + tip total, and per-person share. Presets for common percentages (10%, 15%, 20%), custom %, and equal split. Runs in your browser. No signup.
Free time-and-a-half calculator — enter your regular hourly rate and overtime hours to calculate pay at 1.5× rate. Instant results for payroll and wage verification. No signup. Runs locally in your browser when supported—no upload required for normal use.
Free online calculators for BMI, percentages, calories, salary, gardening, cooking, electrical DIY, home improvement, and more—results in your browser with no account and no data stored on servers.
Pick a calculator, enter your values, and get the answer in seconds.
No signup required · No data stored · Works on desktop and mobile
Online calculators solve common math, finance, health, and everyday problems—from percentages and discounts to BMI, work hours, and salary estimates—with instant, copyable results.
Online calculators are simple tools that turn a question into a clear numeric answer. Instead of doing manual arithmetic (and risking mistakes), you enter inputs and get a result instantly—often with breakdowns, formulas, and practical interpretations.
This calculators hub helps you find the right calculator quickly—whether you're calculating tips, discounts, percentages, BMI, GPA, work hours, overtime, or salary estimates.
Concise answers for common searches — definitions, steps, and comparisons.
Yes. Each calculator runs in your browser with JavaScript—no account, no upload, and no storage of your inputs on EverydayTools servers. Suitable for quick BMI, budget, or payroll estimates; not a substitute for clinical, tax, or legal advice.
Use the Bi-Weekly Payroll Calculator for hourly rate × hours × 2 plus overtime. For annual salary divided into pay periods, start with Salary to Hourly Calculator, then open the payroll tool that matches your schedule.
Select what you're solving: percentage, tip, discount, salary, BMI, GPA, or work-hours.
Type the values (amounts, rates, heights/weights, times). Use the exact units the calculator expects.
Review both the final answer and any intermediate values (like tax, overtime split, or percentage change).
Copy the number into a form, budget, quote, invoice, or plan.
Common real-world scenarios where this tool saves time.
Calculate discounts, markups, sales tax, and final prices quickly.
Estimate salary, savings goals, and percentage splits for budgets and bills.
Calculate BMI and related metrics for fitness plans and progress tracking.
Compute work hours, breaks, overtime, and estimated pay for timesheets.
Input
Original price: $120, Discount: 15%Output
$102 (you save $18)Great for shopping and pricing scenarios; shows both final price and savings.
Input
Bill: $46.50, Tip: 18%Output
$8.37 tip, $54.87 totalUse for restaurant bills, delivery orders, and split checks.
Input
Old: 80, New: 92Output
15% increaseUseful for growth metrics, KPI reporting, and price changes.
Most calculators follow standard formulas (percentages, ratios, rates) and return both a final value and a practical breakdown. For time-based calculators, times are converted to minutes first to avoid rounding errors, then returned as hh:mm and decimal hours.
| Category | Example tools | Typical question |
|---|---|---|
| Health | BMI, Calorie, Body Fat | What is my BMI or daily calories? |
| Finance | Mortgage, Break-even, Tip | What is my payment or margin? |
| Work | Bi-weekly pay, Overtime, Timesheet | What is my paycheck or hours? |
| Math | Percentage, GPA, Fraction | What is X% of Y? |
| Gardening | Mulch, Raised Bed Soil, Topsoil | How much soil or mulch do I need? |
| Cooking | Recipe Scaler, Baking Conversion, Turkey | How do I scale this recipe? |
| Electrical DIY | Wire Gauge, Breaker Sizing, Voltage Drop | What wire or breaker size do I need? |
| Home Improvement | Paint, Flooring, Tile, Drywall | How much material for my room? |
Each calculator expects one unit system—check labels before entering values. Convert first or switch to metric/imperial toggles where available. Unit mismatch is the most common cause of wrong BMI, calorie, and fuel results.
If the field label says 15%, enter 15—not 0.15. Discount, tip, and percentage calculators usually expect whole-number percents. When in doubt, read the placeholder or example on that specific tool.
Keep full precision through intermediate steps, then round the final answer—especially for payroll, GPA, and budget splits. Rounding each step can shift totals by dollars or percentage points.
Margin is profit ÷ selling price; markup is profit ÷ cost. A 25% markup is not a 25% margin. Use the Profit Margin Calculator when you need both, and match the definition your accountant or invoice uses.
BMI, calorie, body-fat, and heart-rate tools give population-average estimates—not medical advice. Athletes, pregnancy, and chronic conditions need professional interpretation; use results for planning only.
Salary, tip, and work-hours results are estimates. Overtime thresholds, rounding to the nearest quarter-hour, and bi-weekly vs semi-monthly pay differ by employer and region. Confirm policy before committing to a number.
A percentage-of-a-number tool is not the same as percentage change, tip split, or unit price. Read the tool title and quick answer—this hub groups finance, health, math, and work calculators so you pick the one that matches your inputs.
Fuel, soil, and material calculators often default to one-way distance or a single bed. Enable round trip, order buffer, or bed count when your project needs them—otherwise you may under-order or underestimate cost.
Likely cause: Unit mismatch or percentage entered in the wrong format.
Fix: Confirm units and whether the input expects percent (15) or decimal (0.15).
Likely cause: Overtime thresholds and rounding rules vary by employer and jurisdiction.
Fix: Use your company's policy for overtime and rounding, then compare against the calculator's breakdown.
Likely cause: Different sources use different cutoffs for age groups and populations.
Fix: Use BMI as a general indicator; consult a professional for medical interpretation.
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Yes—they're free with no signup and no usage limits.
All calculators use established, widely accepted formulas—for example, the Mifflin-St Jeor equation for calorie needs, the WHO BMI classification, and standard financial formulas for margin and markup. Results are as accurate as the values you enter. Health calculators give population-average estimates, not clinical diagnoses.
Formulas are deterministic; differences usually come from rounding, unit choice, or policy differences (like overtime/tax rules).
Yes. The calculators are responsive and work on mobile browsers.
Multiply the number by (percent ÷ 100). Example: 15% of 200 = (15 × 200) ÷ 100 = 30. The Percentage Calculator also covers percentage change, increase, and reverse percentage in one tool.
Percentage change = (new − old) ÷ old × 100. Example: 80→92 is (12÷80)×100 = 15%.
BMI (Body Mass Index) is your weight in kilograms divided by the square of your height in metres (kg/m²). It classifies weight status as underweight (below 18.5), healthy (18.5–24.9), overweight (25–29.9), or obese (30+). It is a population-screening tool and does not account for muscle mass, bone density, or fat distribution.
Yes. Use the work-hours calculators to total hours, subtract breaks, and estimate overtime and earnings.
No—calculations run in your browser, and inputs are not uploaded.
No. Open any calculator, enter your values, and get your result immediately—no registration required. No email address, password, or personal information is collected to use these tools.
No. All calculations happen entirely in your browser using JavaScript. No personal data—height, weight, age, health metrics, or financial figures—is sent to a server. Inputs are processed locally and discarded when you close the tab.
The Calorie Calculator uses the Mifflin-St Jeor equation to estimate Basal Metabolic Rate (BMR) from age, sex, height, and weight, then multiplies by an activity factor for TDEE, and derives calorie targets for loss, maintenance, or gain.
Profit margin is profit as a percentage of selling price: (selling price − cost) ÷ selling price × 100. Markup is profit as a percentage of cost: (selling price − cost) ÷ cost × 100. The Profit Margin Calculator shows both.
Break-even units = fixed costs ÷ (selling price − variable cost per unit). The Break-Even Calculator shows this instantly with revenue and cost context.
Yes. The Freelance Rate Calculator takes your desired annual income, expenses, holiday weeks, and billable hours per week, then computes the minimum hourly rate to reach your goal after costs.
Runs in your browser—no signup, no upload, and inputs are not sent to servers.
Uses standard formulas and returns results with sensible rounding for display.
Financial, medical, and payroll results are estimates. For decisions with real consequences, confirm with official policies and professionals.
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Reviewed by EverydayTools Editorial Team on 2026-06-27.
Same workflow or intent — pick the next step without leaving the site.
Calculate BMI instantly from height and weight. Six WHO categories (Obese I/II/III), Asia-Pacific mode, healthy range, visual scale, print & share — runs in your browser.
What is 20% of 500? Percent increase, decrease, difference, markup & margin—runs locally in your browser, no upload. Copy results or share a link.
Calculate sale price and savings from percent or fixed discounts. Reverse original price too. No upload—runs locally in your browser. Free.
Free tip calculator — find tip amount, bill + tip total, and per-person share. Presets for common percentages (10%, 15%, 20%), custom %, and equal split. Runs in your browser. No signup.
Free fraction calculator with steps: add, subtract, multiply, divide, simplify, and show mixed/decimal forms instantly. Fast, private, no signup. Runs locally in your browser when supported—no upload required for normal use.
Free average calculator: arithmetic mean, sum, count, min, max, and range from pasted lists—grades, budgets, or datasets. Private, instant, no signup. Runs locally in your browser when supported—no upload required for normal use.
Cross-category tools others open in the same session.
Free JSON formatter — paste minified or messy JSON and instantly get beautified, indented output with syntax highlighting and error detection. Browser-based, no server upload. Runs locally in your browser when supported—no upload required for normal use.
Compress JPG, PNG & WebP in your browser—up to 80% smaller, batch 25 files, 50/100/200 KB presets. Files stay on your device. No signup.
Free PDF merger — combine multiple PDF files into one document. Drag to reorder files, preview pages, and download the merged PDF instantly. No signup, fully browser-based. Runs locally in your browser when supported—no upload required for normal use.
Instantly count words, characters, sentences, paragraphs, and reading time. Great for essays, articles, and SEO writing. No signup — works as you type. Runs locally in your browser when supported—no upload required for normal use.