Find BMI, payroll, mortgage, tip, percentage, and salary calculators in one place. Every tool runs locally in your browser—nothing is uploaded.
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: sum ingredient costs (unit price × quantity), scale servings, cost per plate. Business margin mode. 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.
Prime checker, factorization (91 = 7×13), prime list to 500 & nth prime finder. Runs locally in your browser—no upload, no signup.
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 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.
Free online calculators for BMI, percentages, calories, salary, discounts, 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? |
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.
More free tools for the same workflow.
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, reverse %, markup & margin—runs locally in your browser, no upload. Copy results or share a link.
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Reviewed by EverydayTools Editorial Team on 2026-05-20.