Math calculators
Percentages, areas and shapes — with the formula shown, not just the answer.
Percentage CalculatorX% of Y, what percent X is of Y, and percentage increase or decrease.
Triangle CalculatorArea, perimeter and type from three sides (Heron’s formula).
Circle CalculatorArea, circumference and diameter from one value.
Rectangle AreaWidth and height to area, perimeter and diagonal.
Square CalculatorSide to area, perimeter and diagonal.
Triangle AreaBase and height to area.
ParallelogramBase and height to area, plus perimeter from the slant side.
Trapezoid AreaTwo parallel sides and the height between them.
Circle AreaRadius to area, circumference and diameter.
Ellipse AreaTwo semi-axes to area and approximate perimeter.
CubeSide to volume, surface area and diagonals.
CylinderRadius and height to volume and surface area.
SphereRadius to volume and surface area.
Fraction to DecimalConvert a fraction to a decimal and percentage.
Ratio CalculatorSimplify a ratio and split an amount by it.
GCD and LCMGreatest common divisor and least common multiple of two numbers.
Prime Number CheckTest whether a number is prime and find nearby primes.
Factorial Calculatorn! for any number up to 170.
Square RootPrincipal square root, plus cube and nth root.
Exponent CalculatorPowers and roots with any base and exponent.
Average CalculatorMean of up to six numbers, with sum and count.
Percentage ChangeIncrease or decrease between two values.
Slope CalculatorSlope and intercept between two points.
Pythagorean TheoremMissing side of a right triangle.
Percent OfX% of a number.
Percent OffSale price after a discount.
Percent IncreaseNew value after a percentage increase.
Percent DecreaseNew value after a percentage decrease.
Percent DifferenceDifference between two values as a percentage.
X is What Percent of YShare of one number in another.
Reverse PercentageOriginal value before a percentage change.
Percentage PointsDifference between two percentages.
LCM CalculatorLeast common multiple of two numbers.
Log CalculatorLogarithm to any base.
Quadratic SolverRoots of ax² + bx + c.
Standard DeviationSpread of up to five values.
PermutationnPr — ordered selections.
CombinationnCr — unordered selections.
Arithmetic Sequencenth term and sum.
Geometric Sequencenth term and sum of a GP.
Distance Between PointsEuclidean distance on a plane.
Scientific NotationConvert to and from scientific notation.
Random NumberA random integer in a range.
Dice RollerRoll dice and see the average.