Inches to Centimeters

Exactly 2.54. That figure is the international definition of the inch, so inches to centimetres is always a multiplication by 2.54 and centimetres to inches is always a division by 2.54, with no measurement uncertainty in either direction.

Turn the fraction into a decimal first: 3/8 = 0.375, then multiply by 2.54: 0.375 × 2.54 = 0.9525 cm. The fraction table on this page gives the common steps — a sixteenth is 0.15875 cm, an eighth is 0.3175 cm and a quarter is 0.635 cm — so most tape readings can be read off directly.

Display rounding. The exact value is 0.0625 × 2.54 = 0.15875 cm, which rounds to 0.16 cm at two decimal places. For joinery or machining, keep the extra digits — over a run of measurements the 0.00125 cm per sixteenth adds up — or use the Millimeters to Inches page, which works in the finer unit.

Convert the feet to inches first (multiply by 12), add the inches, then multiply by 2.54. For example, 5 ft 9 in is 69 inches, and 69 × 2.54 = 175.26 cm. The Feet to Meters page accepts combined feet-and-inches input directly if the metric result you want is metres.

Yes — batch mode on this page multiplies every pasted line by 2.54. Paste a cut list or a column of product dimensions and you get the full set in centimetres at once, instead of the single answer a search widget returns.