33
tools
Maths
Percentages, fractions, equations and averages.
Angle calculator Degrees, radians, gradians and turns, with the angle type. →Area calculator Area of any common shape, with perimeter where it applies. →Aspect ratio calculator The ratio, the missing side, or the largest box that fits. →Average calculator Mean, median and mode from one pasted list. →Circle calculator Radius, diameter, circumference and area from any one of them. →Combination calculator nCr and nPr, with and without repetition. →Confidence interval calculator The interval around a mean, at any confidence level. →Exponent calculator A number raised to any power, including negative and fractional. →Factorial calculator n! exactly up to 20, and in scientific notation beyond. →Fraction calculator Add, subtract, multiply and divide fractions, reduced. →GCD calculator Greatest common divisor and lowest common multiple. →Golden ratio calculator The other side of a golden rectangle, from either one. →LCM calculator Lowest common multiple, and the GCD alongside it. →Matrix calculator Multiply, add, transpose, invert and find determinants. →P-value calculator P-value from a z-score, one-tailed or two. →Percentage calculator The four percentage questions people actually ask. →Percentage change calculator Increase or decrease between two numbers, both directions. →Permutation calculator Arrangements where the order matters. →Probability calculator Single events, combined events, and repeated trials. →Online protractor Measure or set an angle, 0 to 180. →Quadratic equation solver Roots, discriminant and vertex for ax² + bx + c. →Ratio calculator Simplify a ratio, solve a proportion, or split by shares. →Rounding calculator Round up, down, to nearest, or the banker's way. →Sample size calculator How many responses you need for a given margin of error. →Scientific calculator A full expression, not one key at a time. →Scientific notation converter Both directions, plus engineering notation. →Significant figures calculator Round to significant figures, and count them as written. →Slope calculator Slope, angle, distance and the line equation. →Square root calculator Square roots, cube roots and any nth root. →Standard deviation calculator Mean, median, spread and both kinds of standard deviation. →Triangle calculator Solve a right triangle, or find area from three sides. →Volume calculator Seven shapes, with capacity in litres and gallons. →Z-score calculator How many standard deviations from the mean, and the percentile. →
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