Maths
Everyday maths tools for arithmetic, percentages, ratios, fractions and rounding: the calculations people actually reach for, not algebra or calculus.
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, round a number cleanly, or practise nursing-style percentage, ratio and dosage maths with worked solutions.
Splitting a bill by percentage, simplifying a recipe ratio, or rounding a measurement to the right number of significant figures.
Conventions and limitations
Every calculator here shows its working before rounding, so the figure you see is the result of the exact calculation, not a rounded intermediate step.
9 tools in this category
- Basic CalculatorEveryday arithmetic: addition, subtraction, multiplication and division.
- Scientific CalculatorAdvanced calculator with trigonometric, logarithmic and exponential functions.
- Percentage CalculatorWork out percentages, percentage of a number, and reverse percentages.
- Percentage Change CalculatorCalculate the percentage increase or decrease between two values.
- Average CalculatorCalculate the average (mean) of a list of numbers.
- Ratio CalculatorSimplify ratios and scale them up or down.
- Fraction CalculatorAdd, subtract, multiply and divide fractions.
- Rounding CalculatorRound numbers to a chosen number of decimal places or significant figures.
- Nursing Maths PracticePractice percentage, ratio, unit conversion and fictional medication maths with worked solutions.