Math
Fast calculators for percentages, discounts, rule of three, fractions, weighted average, chained discounts, greatest common divisor (GCD), least common multiple (LCM) and basic statistics.
Percentage calculator
Find the % of an amount, what % one number is of another, or the percentage change between two values.
Discount calculator
Calculate the final price and how much you save when applying a discount.
Rule of Three Calculator
Calculate direct or inverse proportions between three known values and one unknown.
Fraction Calculator
Add, subtract, multiply or divide two fractions and get the simplified result.
Weighted Average Calculator
Calculate the weighted average of up to four values with their respective weights.
Successive Discounts Calculator
Calculate the final price when applying several successive discounts to the same price.
GCF and LCM calculator
Calculate the greatest common factor (GCF) and least common multiple (LCM) of two numbers.
Statistics calculator (mean, median, mode)
Calculate the mean, median, mode, range and standard deviation of a set of numbers.
How to choose the right calculator
Percentages and discounts
Use the Percentage calculator to find what share one number is of another, or how much a value has gone up or down. When comparing offers, the Discount calculator gives you the final price and the savings. For several discounts in a row, use the Successive discounts calculator: they do not add up, because each one applies to the price left by the previous one.
Ratios and fractions
The Rule of three calculator solves direct and inverse proportions, such as scaling a recipe, changing the scale of a drawing or splitting up consumption. The Fraction calculator adds, subtracts, multiplies or divides two fractions and gives you the result in simplest form.
Averages and statistics
The Weighted average calculator is the right choice when each value counts differently, for example grades with different credit weights. For a list of data, the Statistics calculator gives the mean, median and mode. The GCF and LCM calculator helps you simplify fractions or find out when two cycles line up.