Gardening calculators
Start with the Raised Bed Soil Calculator hub, then open related calculators for your project.
- Mulch Calculator
- Compost Calculator
- Topsoil Calculator
- Gravel Calculator
- Plant Spacing Calculator
- Grass Seed Calculator
Start with popular calculators: BMI, percentage, tip, and discount. 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.
Start with popular calculators: BMI, percentage, tip, and discount. 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 how many calories you need per day. Mifflin-St Jeor BMR, activity TDEE, and lose/gain starting points. US and metric. Runs in your browser.
Free tip calculator for restaurants and delivery: 15–25% presets, custom tip, optional tax, equal or unequal split, and per-person totals in your browser.
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.
Enter two birthdays to see who is older and the exact age gap in years, months, and days—plus how many days apart. Free, private, no signup.
Enter two birthdays to see who is older and the exact age gap in years, months, and days—plus how many days apart. Free, private, no signup.
Paste numbers (commas, spaces, or new lines) and get the arithmetic mean instantly—plus sum, count, min, max, and range, with calculation steps. Free, private, no signup.
Estimate your biweekly paycheck from salary or hourly pay. See gross, 2026 federal/FICA take-home, overtime, and 26 vs 24 pay periods. Free, private, no signup.
Free adult BMI from height and weight (lb/ft/in or kg/cm). CDC category, healthy weight range, optional waist. Screening only—runs in your browser.
Estimate body fat % with the US Navy tape method. Height, waist, neck, and hip (women). Fat mass and lean mass. Free, private, US + metric.
Find break-even units and sales revenue from fixed costs, price, and variable cost. Includes contribution margin, target profit, and margin of safety. Free, runs in your browser.
Estimate how many calories you need per day. Mifflin-St Jeor BMR, activity TDEE, and lose/gain starting points. US and metric. Runs in your browser.
Free charity calculator: estimate donations by income, percentage, or a fixed gift. Compare monthly and annual plans in your browser — not tax or Zakat advice.
Calculate nCr (n choose r) with exact integers, formula steps, and optional repetition. Runs in your browser.
Compare U.S. city cost of living and estimate the salary needed to keep similar purchasing power. Optional offer and monthly budget comparison. Browser-only BEA 2024 estimates.
Calculate net work hours from clock-in, clock-out, and unpaid breaks—decimal output for timesheets. No upload: runs locally in your browser. Free.
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: convert watts to kWh, estimate appliance costs and monthly bills from your kWh rate. US EIA rate presets. Runs in your browser.
Calculate powers, negative and fractional exponents, and missing exponents or bases, with steps. Runs in your browser.
Calculate factorial n! for 0 ≤ n ≤ 500 with exact big-integer results. No upload—runs locally in your browser. Free, instant n! for combinatorics.
Add, subtract, multiply, divide, simplify, compare, and convert fractions, mixed numbers, decimals, and percents with exact steps. Runs in your browser.
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.
Calculate trip gas cost from miles, US MPG, and pump price. See gallons, cost per mile, round-trip and split costs. Private, in your browser.
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.
Ideal weight by height using Devine, Robinson, Miller, and Hamwi, plus the adult healthy BMI range, in kg and lb. Runs in your browser.
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.
Calculate logarithms in any base, including log10, ln, and log2, with change-of-base steps and reverse solving. Runs in your browser.
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.
Paste a list to find mean, median, and mode with steps. Also shows range, quartiles, IQR, outliers, and standard deviation. Runs in your browser.
Plan take-home income, expenses, savings, and a 50/30/20 or custom split. See the monthly surplus in your browser. Amounts stay on this device.
Free online calculator for +, −, ×, and ÷. Phone-style % (200+10%=220), tape saved on this device, keyboard or tap.
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.
Free pregnancy due date calculator: last period, conception, IVF, or ultrasound to estimate due date, weeks pregnant, fetal age, and trimester. Dates stay in your browser.
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.
Calculate compost from area and depth — cubic yards, cubic feet, liters, and bags. Optional buffer. Runs 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 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.
Calculate grass seed needed for your lawn in seconds. Get pounds, bags, coverage and cost for new lawns or overseeding by sq ft or acre.
How much sod do I need? Measure lawn shapes, subtract hardscape, add waste, then get square feet, pallets, and rolls. Coverage is supplier-specific. Runs 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 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.
Calculate landscape fabric and whole rolls from bed size, roll width and length, seam overlap, and waste. Supports multiple beds. Free, runs 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 for vinyl plank, laminate and hardwood. Estimate square feet, boxes, waste, underlayment and material cost for one or multiple rooms.
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 for walls and ceilings. Estimate 4×8, 4×10 or 4×12 sheets, waste, joint compound, tape, screws and optional cost.
Calculate concrete for slabs, footings, post holes, and steps — cubic yards, cubic feet, cubic meters, and 40/60/80 lb bags. Runs in your browser.
Find how much carpet you need in square feet and square yards from room size, roll width, and waste. Compare layouts and flag seams. US and metric. Runs locally in your browser.
Free insulation calculator for attics, walls and floors. Estimate batts, blown-in bags, spray foam board feet, R-value, thickness and optional cost 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.
Calculate roof pitch from rise and run instantly. Get pitch, angle, slope %, rafter length and roof pitch multiplier with this free online calculator.
Calculate roof area and square footage from length, width, pitch, and overhang. Get roof surface area, roofing squares, waste, and pitch factor instantly.
Count metal roof panels from eave width and installed coverage, then see squares, slope length, and optional material cost. Runs in your browser.
Free gutter calculator for linear feet, gutter sections, downspouts, hangers, waste, and optional material cost. Runs in your browser.
Free fascia board calculator: eave + rake sections → linear feet, waste, and boards to order. Optional material cost. Runs locally in your browser.
Free soffit calculator: eave length × soffit depth → square footage, waste, optional panels, cost, and soffit vent NFA. Runs in your browser.
Calculate roof area, roofing squares, shingle bundles, underlayment and material cost from roof dimensions and pitch. Free online roofing calculator.
Free pipe volume calculator: inside diameter and length → US gallons, liters, cubic feet, water weight, and gallons per foot.
Free drain slope calculator: horizontal run and slope in/ft → total drop and percent grade with IPC minimum check. Runs locally in your browser.
Size a storage tank from peak-hour demand and First Hour Rating, or a tankless heater from GPM, temperature rise, and BTU. Runs in your browser.
Estimate pipe diameter and nominal size from GPM and velocity, check an existing bore, or total fixture units. Runs in your browser.
Calculate how much PEX tubing you need in linear feet, add waste, and round up to full coils. Free PEX calculator for plumbing runs and material takeoffs.
Use our free septic tank calculator to estimate the right tank size from bedrooms, occupants and wastewater flow. Get gallons, daily flow and a clear sizing breakdown.
Free sump pump calculator: measured pit inflow or rainfall estimate → required GPM, GPH, TDH, and duty point. Runs in your browser.
Calculate peak hot water GPM, temperature rise, and tankless BTU from fixtures that run together. Runs in your browser.
Calculate cooling or heating BTUs for a room from size, ceiling height, climate, insulation, sun, and occupants. Planning estimate — not Manual J.
Estimate furnace size, heating load, and input BTU/hr from square footage, climate, insulation, ceiling height, and AFUE. Planning estimate in your browser — not Manual J.
Estimate a heat pump planning range in tons plus cooling and heating BTU/h from home size, climate, insulation, and ceiling height. Runs in your browser — not Manual J.
Calculate HVAC duct CFM from duct size, velocity, tons, or cooling BTU, and find a practical duct size. Runs in your browser.
Calculate HVAC duct size from CFM and velocity or friction rate, for round, rectangular, and flex duct. Runs in your browser.
Estimate window AC running cost from watts or BTU÷EER, hours/day, and $/kWh — daily, monthly, and seasonal. Runs locally in your browser.
Estimate space heater cost per hour, day, month, and season from watts, hours, and a cents-per-kWh rate. Runs in your browser.
Free recipe scaler calculator to double, halve, or resize any recipe for your serving size. Scale a full ingredient list with fractions. Runs in your browser.
Convert cups to grams by ingredient for flour, sugar, and butter. Instant baking measurement converter for US cups, tablespoons, teaspoons, grams, and ounces.
Convert cake pan sizes and scale batter for round, square, rectangular, loaf, and Bundt pans. Area or volume mode. 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 to water ratio calculator: cups of dry rice and rice type → how much water for stovetop cooking. White, jasmine, basmati, brown, and sushi presets.
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.
Calculate salt grams for wet, dry, or equilibrium brines from gallons, quarts, liters, or meat weight. Reverse mode checks brine percentage. Cup estimates by salt type.
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.
Estimate AWG wire size from amps or watts, check voltage drop, compare copper or aluminum, and convert AWG to mm². Free, browser-based.
Circuit load calculator: add appliance watts on an existing circuit → amps, breaker load %, remaining capacity, and 80% continuous-load reference. Browser-only.
Calculate circuit breaker size from watts or amps, including 120V/240V loads, continuous-load sizing, standard ratings, and matching copper wire. Free, browser-based.
Calculate voltage drop in volts and percent for DC, single-phase, and 3-phase circuits. Check AWG size, copper/aluminum, 12V–480V, and run length.
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.
Calculate 2026 U.S. take-home pay after federal income tax, Social Security, Medicare, and state tax. See annual, monthly, and biweekly net pay. Runs in your browser.
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.
Free online scientific calculator for trig, logs, powers, roots, and factorials. DEG/RAD/GRAD, keyboard input, history, and a numeric calculation breakdown — runs in your browser, no signup.
Free sleep cycle calculator for bedtime and wake-up times. 90-minute cycle estimates, time in bed vs asleep, or sleep now. Times stay in your browser.
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 miles or kilometers instantly. See 5,000–20,000 steps using height or measured step length. Reverse mode included.
Calculate how many hours to study per day or week for an exam, semester, or course. Plan by total hours, chapters, credit hours, study days, and revision time.
Calculate 1.5× overtime: time-and-a-half rate, OT pay, premium, and weekly gross from an hourly wage. Optional salary estimate. Runs in your browser.
Free tip calculator for restaurants and delivery: 15–25% presets, custom tip, optional tax, equal or unequal split, and per-person totals in your browser.
Compare grocery and package prices by ounce, pound, liter, or item. See the cheaper option and savings in your browser.
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.
Estimate Zakat on cash, savings, gold, silver, investments, and business assets. Choose gold, silver, or custom Nisab, subtract eligible debts, and see 2.5% in your browser. Educational estimate only.
Estimate Zakat on cash, savings, gold, silver, investments, and business assets. Choose gold, silver, or custom Nisab, subtract eligible debts, and see 2.5% in your browser. Educational estimate only.
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.
Compare grocery and package prices by ounce, pound, liter, or item. See the cheaper option and savings in your browser.
Free tip calculator for restaurants and delivery: 15–25% presets, custom tip, optional tax, equal or unequal split, and per-person totals in your browser.
Calculate 1.5× overtime: time-and-a-half rate, OT pay, premium, and weekly gross from an hourly wage. Optional salary estimate. Runs in your browser.
Calculate how many hours to study per day or week for an exam, semester, or course. Plan by total hours, chapters, credit hours, study days, and revision time.
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 Size, 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). Open the Break-Even Calculator for units, revenue, contribution margin per unit, optional target-profit units, and margin of safety percentage.
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.
Free adult BMI from height and weight. Use lb/ft/in or kg/cm. Instant BMI, category, and healthy weight range—no signup, private in your browser.
Calculate sale price and savings from percent or fixed discounts. Reverse original price, find % off, and stack coupons—runs locally in your browser. 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.
Free tip calculator for restaurants and delivery: 15–25% presets, custom tip, optional tax, equal or unequal split, and per-person totals in your browser.
Add, subtract, multiply, divide, simplify, compare, and convert fractions, mixed numbers, decimals, and percents with exact steps. Runs in your browser.
Paste numbers (commas, spaces, or new lines) and get the arithmetic mean instantly—plus sum, count, min, max, and range, with calculation steps. Free, private, no signup.
Cross-category tools others open in the same session.
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.
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.
Free word counter — live word, sentence, and paragraph counts plus reading time for essays, blogs, and SEO drafts. Runs locally in your browser.
Free adult BMI from height and weight (lb/ft/in or kg/cm). CDC category, healthy weight range, optional waist. Screening only—runs in your browser.