cm to inches converter
This cm to inches converter turns centimeters into inches as you type, in decimals and in fractions down to 1/16, the way a ruler or a tape measure reads. One tap swaps it to inches to cm.
Formula: in = cm ÷ 2.54 10 ÷ 2.54 = 3.93700787
In every unit (30)
- Nanometer100,000,000 nm
- Micrometer100,000 μm
- Millimeter100 mm
- Decimeter1 dm
- Meter0.1 m
- Decameter0.01 dam
- Hectometer0.001 hm
- Kilometer0.0001 km
- Arpent0.00171028 arp
- Inches3.93700787 in
- Inches (fraction)3 15/16 in (Fraction)
- Feet0.32808399 ft
- Feet + Inch0 ft 3.9 in
- Yards0.10936133 yd
- Miles0.00006214 mi
- Fathoms INTL0.05468066 fm
- Nautical mile0.000054 nmi
- Furlong0.0004971 fur
- Chain0.00497097 ch
- Pole0.01988388 p
- Light year1.057 × 10⁻¹⁷ ly
- Parsec3.2408 × 10⁻¹⁸ pc
- Krabiat19.20122888 Krabiat
- Nio0.00480077 Nio
- Khuep0.4 Kh
- Sok0.2 Sok
- Wa0.05 Wa
- Sen0.0025 Sen
- Yot0.00000625 Yot
- Ångström1,000,000,000 Å
How the cm to inches converter works
Type a length in centimeters and the inches show up at once, along with the same length in every other unit underneath. The round button swaps the units, so the same tool also converts inches to cm. You can type a sum too, such as 2×45 for two 45 cm boards, and read the total straight away.
The rule fits in one number: an inch is exactly 2.54 centimeters. To go from centimeters to inches you divide by 2.54, and to go back you multiply. It is not a rounded figure: since the 1959 international agreement the inch has been defined as 25.4 millimeters, as NIST explains. The cm to inches converter keeps every decimal and only rounds for display.
Common values
| cm | in |
|---|---|
| 1 | 0.3937 |
| 2 | 0.7874 |
| 3 | 1.1811 |
| 4 | 1.5748 |
| 5 | 1.9685 |
| 10 | 3.937 |
| 15 | 5.9055 |
| 20 | 7.874 |
| 25 | 9.8425 |
| 30 | 11.811 |
| 40 | 15.748 |
| 50 | 19.685 |
| 60 | 23.622 |
| 75 | 29.5276 |
| 100 | 39.3701 |
| 150 | 59.0551 |
Reading the result: decimals, fractions and height
Most tape measures sold in the US are marked in sixteenths of an inch, so a decimal like 3.937 is not much help in a workshop. Under the result, the cm to inches converter also shows the nearest fraction: 10 cm reads as about 3 15/16 inches, 1.27 cm as exactly 1/2 inch.
For a height, pick "Feet + Inch" in the list: 180 cm becomes 5 ft 10.9 in, and our height conversion chart lists every common height in both systems. For screen sizes and longer runs of values, the inches to cm chart covers TVs, monitors and phones.
Centimeters show up on most products made outside the US: European furniture, bike frames, clothing labels and luggage limits. A carry-on bag of 55 × 40 × 20 cm is about 21.7 × 15.7 × 7.9 inches, which is why airline size checks are worth doing in both units.