Converters Length
Centimetres to inches
Centimetres
Inches 3.937
Decimals
Live · 1 in = 2.54 cm exactly
Common lengths
1 cm 0.3937 in
10 cm 3.937 in
30 cm 11.811 in
50 cm 19.685 in
100 cm 39.3701 in
150 cm 59.0551 in
180 cm 70.8661 in
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One centimetre is 0.393701 inches, because an inch is defined as exactly 2.54 centimetres. Divide centimetres by 2.54, or multiply by 0.393701. Thirty centimetres is 11.81 inches — very nearly, but not quite, the foot rule it sits next to in a drawer.
How to convert centimetres to inches
1 Enter the length in centimetres.
2 Read the answer in inches, and pick the number of decimals you want.
3 Press ⇄ to convert inches back to centimetres.
Inches are usually spoken in fractions rather than decimals, so 0.375 in is three-eighths and 0.8125 in is thirteen-sixteenths. To turn a decimal into sixteenths, multiply by 16 and round: 0.7 in becomes 11.2, so eleven-sixteenths is the nearest common mark on a tape measure.
Questions
Yes, since the 1959 international yard and pound agreement. Before that the US and UK inches differed very slightly, which mattered to machinists and nobody else.
Sources
NIST — the United States and the metric systemBIPM — The International System of Units (SI)Advertisement
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