The set of operations or tables used to determine the equivalence between various unit of measurement systems or between various multiples or submultiples of the same unit.

### Examples

- To convert measurements in centimetres into metres, divide the number of centimetres by 100: 342 cm = (342 ÷ 100) m = 3.42 m.
- To convert degrees Celsius (°C) into degrees Fahrenheit (F), use the formula \(F=\frac{9}{5}\times C+32\)