How this inch to centimetre calculator works
Enter a length in inches. The calculator multiplies it by 2.54 and shows the result in centimetres, always to two decimal places. Centimetres = inches × 2.54.
The international inch is defined as exactly 2.54 centimetres, so the factor never changes. 1 inch is 2.54 cm. 2 inches is 5.08 cm. Half an inch is 0.5 × 2.54 = 1.27 cm.
Twelve inches make one foot, and 12 × 2.54 = 30.48 cm. Six inches, half a foot, is 15.24 cm. Thirty-six inches make one yard, and 36 × 2.54 = 91.44 cm. A height of 5 feet 6 inches is 66 inches, which is 66 × 2.54 = 167.64 cm. Type the inches, not the feet: 5.6 in this box is 5.6 inches, which is 14.22 cm, not 5 feet 6 inches.
Any finite number is accepted, including 0 and negatives. 0 inches is 0.00 cm, and −1 inch is −2.54 cm. An empty box shows --. The result is centimetres, not millimetres. One centimetre is 10 millimetres, so 1 inch is 2.54 cm, or 25.4 mm, and the page prints the centimetre figure.