Maths
Geometry, statistics, number theory and a full scientific keypad.
Statistics
Average Calculator
The average of a list of numbers, with median, mode and spread.
Standard Deviation Calculator
Mean, variance and both standard deviations.
Number Sequence Calculator
Generate arithmetic or geometric progressions.
Sample Size Calculator
How many responses a survey needs for a given margin.
Probability Calculator
Chance of single and independent events.
Statistics Calculator
A full descriptive summary of any data set.
Mean, Median, Mode, Range Calculator
The five-number summary of any data set.
Permutation and Combination Calculator
Ordered and unordered selections from n items.
Z-score Calculator
Standard score and the percentile it sits at.
Confidence Interval Calculator
Margin of error and the interval around a mean.
Geometry
Triangle Calculator
Area, perimeter and angles from three side lengths.
Volume Calculator
Volume of a box, cylinder, sphere or cone.
Slope Calculator
Gradient, intercept and angle between two points.
Area Calculator
Area and perimeter of common shapes.
Distance Calculator
Distance between two points in a plane.
Circle Calculator
Radius, diameter, circumference and area.
Surface Area Calculator
Total surface area and volume of a rectangular solid.
Pythagorean Theorem Calculator
Solve for the missing side of a right triangle.
Right Triangle Calculator
Hypotenuse, angles and area from the two legs.
More in Maths
Percentage Calculator
Every percentage question — of, is, and change.
Fraction Calculator
Add, subtract, multiply and divide fractions, simplified.
Scientific Calculator
A full keypad with trigonometry, powers and parenthesis.
Exponent Calculator
Powers, roots and scientific magnitudes.
Root Calculator
Any nth root, including square and cube.
Log Calculator
Logarithms in any base, plus the natural log.
Quadratic Formula
Roots of ax² + bx + c = 0, real or complex.
Ratio Calculator
Solve a proportion and reduce it to its simplest form.
Half-Life Calculator
Remaining quantity after radioactive decay.
Percent Error Calculator
How far a measurement sits from the true value.
Rounding Calculator
Round to any precision, with ceiling and floor.
Least Common Multiple
The smallest number both values divide into.
Greatest Common Factor
The largest number dividing both values.
Prime Factorization
Break any number into its prime factors.
Binary Calculator
Convert between decimal, binary, octal and hex.
Scientific Notation
Convert any number into standard form.
Random Number Generator
Reproducible random numbers within a range.
P-value Calculator
Significance from a z-score.