Everyday Math
MAD Calculator
Find mean absolute deviation, the average, and a complete deviation table.
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Less guesswork. More clarity. 378+ free online calculators and unit converters for everyday math, finance, statistics, and science — with step-by-step formulas and working included.
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Find the mean absolute deviation in a moment.
Mean absolute deviation2.4
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378 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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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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Health & Fitness
80% Maximum Heart Rate Target Calculator
Calculate 80% of an entered maximum heart rate for training reference.
Savings & Planning
Restaurant Service Sales Revenue Calculator
Calculate sales revenue for restaurant service from covers and average check.
Physics
Heat Energy Rate Calculator
Calculate heat energy for heat energy rate from power and time.
Everyday Math
24th Power Calculator
Raise a real number to the power of 24.
Unit Converters
Kilometer to Foot Converter
Convert kilometer values to foot using the standard length conversion factor.
Other Calculators
Build Jobs Average Rate Calculator
Calculate average rate for build jobs from total amount divided by count.
FROM THE BLOG
Practical explanations and examples.
Deep-dive guides, retirement strategies, and unit conversion insights written with precision.
Rafter Length and Roof Pitch: Calculating Run, Rise, Line Length & Degrees for Any Slope
Step-by-step rafter framing math: converting fractional pitches (4/12, 6/12) to angles in degrees, calculating hypotenuse lengths, and deducting ridge boards.
Flooring Calculator Guide: How to Calculate Square Footage, Box Quantities & Waste Factors
Learn how to accurately measure rooms with alcoves, calculate square footage, determine waste allowance for herringbone or straight patterns, and estimate boxes.
Sand Calculator: How Many Cubic Yards, Tons, and Bags of Sand Do You Need for Construction?
Accurately calculate sand volume, wet vs dry density differences, paver bedding thickness, and bulk material costs for residential and commercial jobs.