All calculators
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Math & Conversions
Everyday arithmetic, percentages and units.
Age Calculator
Work out an exact age in years, months and days from any birth date.
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Aspect Ratio Calculator
Resize dimensions while keeping the aspect ratio, and simplify it.
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Circle Calculator
Find a circle’s radius, diameter, circumference and area from any one.
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Area Calculator
Find the area and perimeter of rectangles, circles and triangles.
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Combinations & Permutations
Count combinations (nCr) and permutations (nPr) of a selection.
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Distance & Midpoint Calculator
Distance, midpoint and slope between two points (x₁,y₁) and (x₂,y₂).
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Date Difference Calculator
Count the days, weeks, months and working days between two dates.
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Exponent Calculator
Raise a number to a power, plus squares, cubes and roots.
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LCM & GCD Calculator
Find the greatest common divisor and least common multiple of numbers.
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Percentage Change Calculator
Find the percentage increase or decrease between two numbers.
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Percentage Calculator
Find a percentage of a number, a ratio, or a percentage change.
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Prime Factorization Calculator
Break a number into its prime factors and count its divisors.
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Pythagorean Theorem Calculator
Solve the hypotenuse or a missing leg of a right triangle.
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Quadratic Equation Solver
Solve ax² + bx + c = 0 with the discriminant, roots and vertex.
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Ratio Calculator
Simplify ratios to lowest terms or solve a proportion for the missing value.
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Slope & Line Equation Calculator
Find the slope, equation, length and angle of a line from two points.
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Speed, Distance & Time Calculator
Solve for speed, distance or time — with unit conversions and pace.
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Unit Converter
Convert length, weight and temperature between metric and imperial.
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Volume Calculator
Find the volume of a box, cylinder, sphere or cone.
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