Math Calculator
Volume Calculator

Cube Calculator
Given the side length of a cube, find its surface area and volume, or work backward from t...
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Cuboid Calculator
Given the width, depth, and height of a cuboid, find its volume and surface area.
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Tetrahedron Calculator
Given the side length of a regular tetrahedron, find its surface area and volume.
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Triangular Prism Calculator
Given the side length of a triangular prism, find its surface area and volume.
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Square Prism Calculator
Given the side length of a square prism, find its surface area and volume.
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Pentagonal Prism Calculator
Enter the side of the regular pentagon and the prism length to get the volume and surface ...
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Hexagonal Prism Calculator
Given the side length of a hexagonal prism, find its surface area and volume.
Read MoreTriangle Calculator

Equilateral Triangle Calculator
An equilateral triangle has three equal sides and three 60° angles. Knowing one of its hei...
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Right Triangle Calculator
A right triangle has one 90° angle. Using the Pythagorean theorem, two known sides let you...
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Percentage Calculator
"Percent" is a unit for expressing a ratio out of 100, derived from the Latin "per centum"...
Read MoreFractions Calculator

Fraction Arithmetic Calculator
Basic arithmetic with fractions is essential and applies to ratios, proportions, and proba...
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Fraction/Decimal Converter Calculator
Convert a fraction to a decimal or a decimal to a fraction.
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Fraction Comparison Calculator
Compare two fractions and see which is larger, with both rewritten over a common denominat...
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GCD & LCM Calculator
Uses the Euclidean algorithm to find the greatest common divisor (GCD) and least common mu...
Read MorePlane Figures Calculator

Circle Area & Circumference Calculator
Enter the radius to calculate the area and circumference of a circle.
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Trapezoid Area Calculator
Enter the top base, bottom base, and height to calculate the area of a trapezoid.
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Rectangle Area Calculator
Enter the width and height to calculate the area and perimeter of a rectangle.
Read MoreStatistics Calculator

Standard Deviation Calculator
Enter comma-separated numbers to calculate the mean and population standard deviation.
Read MoreGeneral Math Calculator

Prime Factorization Calculator
Enter a natural number to find its prime factors and exponents, the basis for GCD and LCM....
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Permutation & Combination Calculator
Enter the total (n) and chosen (r) to calculate permutations (nPr) and combinations (nCr)....
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Angle Converter Calculator
Convert degrees to radians and radians to degrees, with the common angles (30°, 45°, 60°, ...
Read MoreAbout This Category
The mathematics calculators cover the three things people actually need: arithmetic that has to be exact (fractions, GCD and LCM, percentages), formulas that have to be right (areas, volumes, equations) and summaries that have to be honest (mean, median, standard deviation).
Every page states the formula it applies, so the number can be reproduced with a pencil. Where a problem allows several valid approaches — comparing fractions by common denominator or by decimal, solving a cubic by factorising or by Cardano — the calculator says which one it used.
Frequently Asked Questions
Why are fractions shown together with decimals?
Because each form answers a different question. The decimal is easier to compare and to carry into further arithmetic, while the fraction keeps the exact value: 1/3 is 0.333… forever, so rounding it early changes the answer.
How do I find the area of an irregular shape?
Split it into triangles, rectangles and trapezoids, compute each part and add the results. Every polygon can be triangulated this way, which is why the triangle and trapezoid pages are the building blocks for the rest.
Is the standard deviation a population or sample figure?
The pages label it explicitly. Population divides by n; sample divides by n − 1 to correct for estimating the mean from the same data. With fewer than about 30 observations the difference is clearly visible.
Calculators in This Category
Sources & last update
2026-10-19