38 FREE TOOLS
Math & Percentage calculators
Work through arithmetic, algebra and statistics with explicit inputs and a reproducible method.
← All calculators
Basic Calculator
Perform basic arithmetic on two numbers with a chosen operation.
Scientific Calculator
Evaluate supported scientific operations with explicit angle and input settings.
Percentage Calculator
Find a percentage of a number or compare a part with its whole.
Percentage Change Calculator
Measure a percentage increase or decrease from a starting value.
Percentage Difference Calculator
Compare two values using their average as the percentage-difference base.
Fraction Calculator
Add, subtract, multiply or divide fractions and simplify the result.
Fraction to Decimal Calculator
Convert a fraction's numerator and denominator into a decimal value.
Decimal to Fraction Calculator
Express a decimal value as a simplified fraction.
Ratio Calculator
Simplify two quantities into their smallest whole-number ratio.
Proportion Calculator
Find a missing value when two ratios are proportional.
Average Calculator
Calculate the arithmetic average of a list of numbers.
Weighted Average Calculator
Find an average when each value carries a different weight.
Mean Median Mode Calculator
Compare the mean, median and mode of a number set.
LCM Calculator
Find the least common multiple of the integers you enter.
HCF/GCD Calculator
Find the highest common factor shared by a group of integers.
Prime Number Calculator
Check whether an entered whole number is prime.
Factor Calculator
List the positive factors of an entered integer.
Square Root Calculator
Find the principal square root of a non-negative number.
Cube Root Calculator
Calculate a number's real cube root, including negative values.
Exponent Calculator
Raise a base number to the power you enter.
Logarithm Calculator
Calculate a logarithm using a chosen base.
Remainder Calculator
Find what is left over after integer division.
Modulo Calculator
Calculate a modulo value with an explicit divisor.
Absolute Value Calculator
Find a number's distance from zero without its sign.
Quadratic Equation Calculator
Solve a quadratic equation from its three coefficients.
Linear Equation Calculator
Find the unknown in a single-variable linear equation.
Simultaneous Equation Calculator
Solve two linear equations with two unknowns.
Sequence Calculator
Explore terms and sums in arithmetic or geometric sequences.
Permutation Calculator
Count ordered arrangements when selecting items from a group.
Combination Calculator
Count selections where the order of chosen items does not matter.
Probability Calculator
Calculate a probability from favourable and total possible outcomes.
Standard Deviation Calculator
Measure how widely values spread around their mean.
Variance Calculator
Calculate the average squared spread using sample or population variance.
Z-Score Calculator
Express a value's distance from the mean in standard-deviation units.
Confidence Interval Calculator
Estimate an interval around a sample mean at a chosen confidence level.
Sample Size Calculator
Estimate the sample size needed for an entered confidence and error margin.
Correlation Calculator
Measure the linear relationship between paired numerical observations.
Regression Calculator
Fit a straight-line relationship to paired observations for an estimate.
