Math

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Fraction Calculator

Adding, subtracting, multiplying or dividing fractions requires a common denominator or cross-multiplication. Enter both fractions and pick an operation for an instant, simplified answer.

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Geometry Calculator

One calculator for the most-asked geometry: the circumference and area of a circle, the volume of a cylinder, the Pythagorean theorem and the area of a triangle. Choose what you need, enter your measurements and see the formula and the answer straight away — so you also learn to work it out yourself.

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Percentage Calculator

Percentages are everywhere: discounts, interest, VAT and grades. This calculator answers the three most common percentage questions in a single click: how much is X% of Y, what percentage X is of Y, and how much something increased or decreased in percent.

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Percentile Calculator (Z-score)

A percentile shows how a value compares to the rest of a dataset — for example a test score, height, or any other trait that is approximately normally distributed. Enter your own value along with the mean and standard deviation of the reference group, and this calculator instantly works out your z-score and matching percentile.

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Proportion Calculator

A proportion like A/B = C/X shows up everywhere: scale drawings, recipes you want to scale, mixing ratios and unit conversions. Enter A, B and C and this calculator instantly finds the missing fourth term X, showing the cross-multiplication steps.

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RREF Calculator (Matrix)

Enter the coefficients of a system of three linear equations in three unknowns (x, y, z). The calculator reduces the associated matrix step by step to reduced row echelon form (RREF) using Gauss-Jordan elimination and reads off the solution.