Multiplication factors are provided for imperial to metric and metric to imperial conversions for various length/distance, area and volume units including inches, yards, feet, gallons, millimetres, ...

Find out what a metric measurement is and learn the different units of measurement in this BBC Bitesize maths guide.

Environment Canada's use of Celsius marks its 50th anniversary in 2025. It was the catalyst of a lengthy national metric conversion that abruptly ended a decade after it began.