Everyday Math
MAD Calculator
Find mean absolute deviation, the average, and a complete deviation table.
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Find the mean absolute deviation in a moment.
Mean absolute deviation2.4
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373 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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The useful part is not just the number. It is knowing what went in, which method was used, and where the limits are.
How our tools work01
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02
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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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Build Jobs Average Rate Calculator
Calculate average rate for build jobs from total amount divided by count.
Ecology & Sustainability
Solar Avoided Emissions Calculator
Calculate avoided emissions for solar avoided emissions from solar energy and grid emission factor.
Everyday Math
23rd Power Calculator
Raise a real number to the power of 23.
Savings & Planning
Rental Property Monthly Rent Revenue Calculator
Calculate monthly rent revenue for rental property from occupied units and rent per unit.
Physics
Force Calculator
Calculate force for force from mass and acceleration.
Construction
Deck Boards Board Length Total Calculator
Calculate board length total for deck boards from board count and board length.
FROM THE BLOG
Practical explanations and examples.
Deep-dive guides, retirement strategies, and unit conversion insights written with precision.
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.
The Complete Asphalt Calculator Guide: Estimating Tons, Cubic Yards, Thickness & Paving Costs
Everything contractors and homeowners need to know before ordering hot mix asphalt — density factors, sub-base preparation, and tonnage estimation.
Square Roots Explained: Estimation Methods, Long Division Algorithm & Square Root Curves
Explore the mathematics of square roots from Babylonian iterative algorithms to grading curve distributions and radical simplification techniques.