Work out inch to centimetre instantly with clear inputs, formula shown and shareable results.
Converting Inches to Centimetres is a single multiplication: one in equals 2.54 cm, so the amount is multiplied by that factor. Switching the direction divides by the same factor instead. This factor is an exact definition, not a rounded approximation, so the conversion is precise at any scale.
Inches → Centimetres
cm = in × 2.54
Centimetres → Inches
in = cm ÷ 2.54
One in is 2.54 cm. That figure is exact by definition.
Divide by 2.54 instead of multiplying — or just switch the direction selector, which does it for you.