If there are feet, multiply them by 12 and add them to the inches.
Multiply the inches by 2.54 to get centimetres; multiply by 25.4 for millimetres.
Worked example
A 6 ft 2 in door frame is 74 in, and 74 × 2.54 = 187.96 cm. A 3/4 inch screw is 1.9 cm, or 19.05 mm.
Inches to cm chart
Inches to centimetres, rounded to 2 decimals
in
cm
0.25 in
0.64 cm
0.5 in
1.27 cm
1 in
2.54 cm
2 in
5.08 cm
3 in
7.62 cm
4 in
10.16 cm
5 in
12.7 cm
6 in
15.24 cm
8 in
20.32 cm
10 in
25.4 cm
12 in
30.48 cm
15 in
38.1 cm
18 in
45.72 cm
20 in
50.8 cm
24 in
60.96 cm
30 in
76.2 cm
32 in
81.28 cm
36 in
91.44 cm
40 in
101.6 cm
48 in
121.92 cm
50 in
127 cm
60 in
152.4 cm
72 in
182.88 cm
The inch is exactly 2.54 cm by definition, so these conversions are exact to the decimals shown. Everything runs in your browser.
Frequently asked questions
How many centimetres are in an inch?
Exactly 2.54 cm. The inch has been defined that way since the international yard and pound agreement of 1959.
How do I convert inches to cm?
Multiply by 2.54. 12 inches × 2.54 = 30.48 cm, so a foot is 30.48 cm.
How do I convert feet and inches to cm?
Turn the feet into inches (12 each), add the inches, then multiply by 2.54. 5 ft 7 in is 67 in, which is 170.18 cm; enter 5 feet and 7 inches above to get it directly.
How big is a 55-inch TV in cm?
TV sizes are the diagonal of the screen: 55 in is 139.7 cm, 43 in is 109.22 cm and 65 in is 165.1 cm.
