cm to inches converter
1 centimeter is 0.393701 inches. To convert cm to inches, divide the number of centimeters by 2.54.
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175 centimeters =
68.8976in
Also written as 5 ft 8.9 in
Formula: in = cm ÷ 2.54
Show the steps
- Definition: 1 cm = 0.01 m (SI prefix centi); 1 in = 2.54 cm exactly
- 175 cm ÷ 2.54 = 68.8976 in
Definitions used: 1 cm = 0.01 m (SI prefix centi); 1 in = 2.54 cm exactly.
Source: NIST SP 811, Appendix B.8, checked on .
How to convert centimeters to inches
Divide the value in centimeters by 2.54. The factor follows from the definitions: 1 cm = 0.01 m (SI prefix centi), and 1 in = 2.54 cm exactly.
in = cm ÷ 2.54
Worked example: 175 cm to in
- Definition: 1 cm = 0.01 m (SI prefix centi); 1 in = 2.54 cm exactly
- 175 cm ÷ 2.54 = 68.8976 in
- Answer: 175 cm = 68.8976 in (5 ft 8.9 in).
Centimeters to inches chart
| Centimeters (cm) | Inches (in) | Also written as |
|---|---|---|
| 1 | 0.393701 | about 3/8 in |
| 2 | 0.787402 | about 13/16 in |
| 5 | 1.9685 | about 1 15/16 in |
| 10 | 3.93701 | about 3 15/16 in |
| 15 | 5.90551 | about 5 7/8 in |
| 20 | 7.87402 | about 7 7/8 in |
| 30 | 11.811 | about 11 13/16 in |
| 40 | 15.748 | 1 ft 3.75 in |
| 50 | 19.685 | 1 ft 7.69 in |
| 60 | 23.622 | 1 ft 11.6 in |
| 75 | 29.5276 | 2 ft 5.53 in |
| Centimeters (cm) | Inches (in) | Also written as |
|---|---|---|
| 100 | 39.3701 | 3 ft 3.37 in |
| 150 | 59.0551 | 4 ft 11.1 in |
| 160 | 62.9921 | 5 ft 2.99 in |
| 165 | 64.9606 | 5 ft 4.96 in |
| 170 | 66.9291 | 5 ft 6.93 in |
| 175 | 68.8976 | 5 ft 8.9 in |
| 180 | 70.8661 | 5 ft 10.9 in |
| 185 | 72.8346 | 6 ft 0.835 in |
| 190 | 74.8031 | 6 ft 2.8 in |
| 200 | 78.7402 | 6 ft 6.74 in |
Values rounded to 6 significant digits. Type any other number in the converter at the top of the page.
How do you convert cm to inches in your head?
Multiply the centimeters by 4 and move the decimal point one place left. 50 cm × 4 = 200, so about 20 inches; the exact answer is 19.69. The shortcut runs 1.6% high, which is fine for furniture and luggage but not for machining.
How tall is 170 cm, 175 cm and 180 cm in feet and inches?
170 cm is 66.93 in, or 5 ft 6.9 in. 175 cm is 68.9 in, or 5 ft 8.9 in. 180 cm is 70.87 in, or 5 ft 10.9 in. The converter above writes any height both ways.
More questions about centimeters and inches
How many inches is 1 cm?
1 cm is 0.393701 inches, a little more than 3/8 of an inch. The value comes from the definition of the inch: exactly 2.54 cm.
How many cm are in an inch?
Exactly 2.54 cm. That is the definition of the international inch, so the factor has no rounding.
Is 30 cm the same as 12 inches?
Almost. 30 cm is 11.811 inches, and a 12-inch (1 foot) ruler is 30.48 cm, so a 30 cm ruler is about 5 mm shorter.
How do I read the result on a tape measure?
US tape measures are marked in sixteenths of an inch. The converter shows the nearest sixteenth next to the decimal result, for example 6.89 in is about 6 7/8 in.
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Sources and limits
- NIST SP 811, Appendix B.8
NIST Special Publication 811, Guide for the Use of the SI, Appendix B.8: Factors for Units Listed Alphabetically (page updated August 18, 2025).
National Institute of Standards and Technology. Edition or effective date: . Text in force when checked on .
This is a calculation aid, not an official measurement service. Results are rounded to 6 significant digits for display. For trade, engineering, medical dosing or legal documents, confirm the figure in the official source. Nothing you type leaves your browser.