Maths Calculators
Solve everyday and advanced maths questions with our free online calculators. Covering percentages, fractions, ratios, algebra basics and more.
Featured tools
- Percentage CalculatorWork out a percentage of a number, what percentage one number is of another, or the original number. Fill in any two values.
- Fraction CalculatorAdd, subtract, multiply and divide fractions, with the answer simplified and also shown as a decimal.
- Scientific CalculatorWork out expressions with brackets, powers, roots, logarithms and trigonometry, in degrees or radians.
- Ratio CalculatorSimplify ratios, solve proportions and scale ratios.
All maths calculators (16)
- Basic CalculatorAdd, subtract, multiply and divide with a keypad, for quick everyday sums.
- Scientific CalculatorWork out expressions with brackets, powers, roots, logarithms and trigonometry, in degrees or radians.
- Percentage CalculatorWork out a percentage of a number, what percentage one number is of another, or the original number. Fill in any two values.
- Percentage Change CalculatorFind the percentage increase or decrease between two values, or the new or original value from a percentage change.
- Percentage Difference CalculatorCompare two values symmetrically as a percentage of their average, with no baseline value.
- Average CalculatorFind the average (mean) of a list of numbers, with the total and the count shown so you can check it.
- Ratio CalculatorSimplify ratios, solve proportions and scale ratios.
- Fraction CalculatorAdd, subtract, multiply and divide fractions, with the answer simplified and also shown as a decimal.
- Rounding CalculatorRound numbers to a chosen number of decimal places or significant figures, or to the nearest ten, hundred or thousand.
- Square Root CalculatorFind the square root of a number, shown as exact when it is a perfect square.
- Exponent CalculatorRaise a number to a power, including negative and fractional exponents, with exact results marked as exact.
- Logarithm CalculatorCalculate a logarithm to base 10, base e, base 2 or any base you choose, with exact results marked as exact.
- Quadratic Formula CalculatorSolve ax² + bx + c = 0 with the quadratic formula, showing the discriminant and the real roots.
- Roman Numeral ConverterConvert a whole number to a Roman numeral, or a Roman numeral to a number, from 1 to 3,999.
- Combination CalculatorCount the ways to choose r items from n when order does not matter, as an exact whole number.
- Permutation CalculatorCount the ways to arrange r items chosen from n when order matters, as an exact whole number.
About maths calculators
Work an ordinary sum on the Basic Calculator, or step up to trigonometry, logarithms and bracketed expressions on the Scientific Calculator. Work out a percentage, simplify or scale a ratio, do fraction arithmetic, or round a number cleanly. Raise a number to a power, take a logarithm, solve a quadratic equation for its real roots, convert between numbers and Roman numerals, or count how many ways there are to choose or arrange items, with the working shown alongside every result.