Everyday & maths
A clearer answer to the everyday calculation.
Work through percentages, dates, units and maths, with instructions and examples beside each tool.
A useful place to start
Choose the operation before entering numbers.
Check units, date order or the meaning of the starting value.
Use the worked example to confirm that you interpreted the result correctly.
Choose the right tool for the job.
Percentage Calculator
Calculate percentages, percentage change, and portions.
Open tool EverydayAge Calculator
Calculate age in calendar years, months, and days.
Open tool EverydayDate Difference
Count days and full weeks between two dates.
Open tool EverydayTime Duration
Find elapsed hours and minutes, including overnight.
Open tool EverydayUnit Converter
Convert length, mass, and temperature.
Open tool MathsScientific Calculator
Calculate expressions with brackets and common functions.
Open tool MathsFraction Calculator
Add, subtract, multiply, or divide two fractions.
Open tool MathsRatio Calculator
Simplify a ratio and solve a missing proportion.
Open tool MathsAverage Calculator
Find mean, median, minimum, maximum, and count.
Open tool MathsWeighted Grade
Calculate a weighted average from scores and weights.
Open toolConnect the steps.
An increase from 100 to 120 is a 20% increase. Reversing the calculation, a decrease from 120 to 100 is about 16.67% because the starting value changes.
Know the limits.
Date and grade estimates do not establish official deadlines or eligibility. Check important calculations against the applicable rules.
How we explain methods and sources →