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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383 useful toolsMath, money, time & more
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A FEW GOOD PLACES TO BEGIN
Useful for the everyday.
Focused calculators. Clear results. No sign-up.
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
Start with your numbers
Clear labels, example values, and input checks.
02
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Working, breakdowns, and graphs where they help.
03
Keep what you need
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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NEW IN THE LIBRARY
More ways to work it out.
Recently published calculators from Convert & Count.
Everyday Math
25th Power Calculator
Raise a real number to the power of 25.
Savings & Planning
SaaS Seats Seat Revenue Calculator
Calculate seat revenue for saas seats from paid seats and price per seat.
Physics
Ideal Gas Volume Calculator
Calculate ideal-gas volume from pressure, moles and temperature.
Health & Fitness
85% Maximum Heart Rate Target Calculator
Calculate 85% of an entered maximum heart rate for training reference.
Unit Converters
Kilometer to Inch Converter
Convert kilometer values to inch using the standard length conversion factor.
Health & Fitness
80% Maximum Heart Rate Target Calculator
Calculate 80% of an entered maximum heart rate for training reference.
FROM THE BLOG
Practical explanations and examples.
Deep-dive guides, retirement strategies, and unit conversion insights written with precision.
Fence Post Depth Calculator: Frost Line Depth, Post Hole Ratios & Wind Load Stability
Prevent leaning or heaving fences by applying engineering rules for hole diameter, embedment depth, gravel drainage beds, and concrete pour volumes.
Sonotube Concrete Calculator: Concrete Bags, Cubic Yards & Pier Footing Dimensions
Master the geometry of cylinder footings for deck posts, solar arrays, and pole barns, including bag conversions and below-frost-line depth requirements.
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.