Everyday Math
MAD Calculator
Find mean absolute deviation, the average, and a complete deviation table.
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Mean absolute deviation2.4
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331 useful toolsMath, money, time & more
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A FEW GOOD PLACES TO BEGIN
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Statistics
Binomial Distribution Calculator
Calculate exact, cumulative, at-least, and between probabilities.
Everyday Math
Integer Calculator
Add, subtract, multiply, and divide signed integers with exact results.
Savings & Planning
How Long Will My Money Last?
Explore savings coverage using your spending, income, inflation, and return assumptions.
Savings & Planning
Monthly Savings Calculator
Project a future balance or solve for the monthly deposit needed for a target.
Time
Average Time Calculator
Average elapsed durations and see their total, minimum, and maximum.
Everyday Math
Squaring Calculator
Square a number or fraction and see the exact multiplication.
Everyday Math
Square Root Simplifier
Turn a whole-number square root into its simplest radical form.
Geometry
Reflection Calculator
Reflect points across an axis, a diagonal, or a custom straight line.
Unit Converters
Length Converter
Convert length units with a clear result and a complete equivalence table.
Unit Converters
Temperature Converter
Convert temperature units with a clear result and a complete equivalence table.
Investing
Monthly Dividend Calculator
Estimate annual dividend income and its average monthly equivalent.
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How our tools work01
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03
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Copy, print, or export available result tables.
A LITTLE KNOW-HOW
Make sense of the numbers.
In-depth breakdowns, worked mathematical examples, and practical guidance across 14 topic guides.
Finance & Loans8 min read
How Compound Interest Works (and How to Calculate It)
Learn how compound interest builds wealth, why frequency matters, and how to calculate future value with step-by-step formulas.
Math Fundamentals6 min read
How to Calculate Percentages: Formulas & Examples
Master percentage calculations, percentage increase/decrease, reverse percentages, and avoid common real-world calculation mistakes.
Statistics9 min read
Standard Deviation & Variance: Step-by-Step Guide
Understand the difference between sample and population variance, calculate standard deviation, and interpret real datasets accurately.
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Physics
Ideal Gas Pressure Calculator
Calculate ideal-gas pressure from moles, temperature and volume.
Health & Fitness
60% Maximum Heart Rate Target Calculator
Calculate 60% of an entered maximum heart rate for training reference.
Savings & Planning
Freelance Project Revenue Calculator
Calculate revenue for freelance project from billable hours and hourly rate.
Physics
Centripetal Force Calculator
Calculate centripetal force from mass, speed and radius.
Everyday Math
18th Power Calculator
Raise a real number to the power of 18.
Food & Cooking
Carbohydrate Batch Total Calculator
Calculate total carbohydrate for carbohydrate batch from servings and carbs per serving.
FROM THE BLOG
Practical explanations and examples.
Deep-dive guides, retirement strategies, and unit conversion insights written with precision.
Reflection in Geometry: Rules, Formulas & Reflection Calculator Guide
Master geometric reflections step-by-step. Learn reflection formulas for axes and custom lines, rules for coordinates and shapes, and how to use an online reflection calculator.
How to Calculate Percentage Change: Formula, Examples & Common Mistakes
Learn the percentage change formula step-by-step, see real-world examples, and avoid the most common mistakes people make when calculating increase or decrease.
The Complete 457(b) Calculator Guide: Contributions, Roth, Loans, Withdrawals, and RMDs
Everything public employees need to know before relying on a 457 calculator — from catch-up rules and Roth options to loans, RMDs, and pairing it with a pension.