Convert cm to inches instantly
Type any centimeter value above and get the exact inch equivalent right away. Whether you are checking clothing sizes, reading a blueprint, or comparing product dimensions, this converter handles it in one step.
1 cm = 0.3937 inches. For the reverse, use the toggle to switch to inches to cm. Everything runs in your browser — nothing is sent to a server.
How to use this cm to inches converter
- Enter your measurement in centimeters in the input field above.
- The inch value appears instantly — no button to click.
- Need to go the other way? Hit the swap/reverse toggle to convert inches back to centimeters.
- Copy the result or keep adjusting until you have what you need.
Worked example: 30 cm to inches
Say you have a piece of fabric that measures 30 cm and a sewing pattern that uses inches. Here is what happens:
- Divide 30 by 2.54 (the number of centimeters in one inch).
- 30 ÷ 2.54 = 11.8110 inches.
So 30 cm is just under 11 and 13/16 inches — about 11.81 inches rounded to two decimal places.
How the conversion is calculated
One inch is defined as exactly 2.54 centimeters (set by international agreement in 1959). That single fact is all the math you need.
Formula — centimeters to inches:
inches = cm ÷ 2.54Formula — inches to centimeters (reverse):
cm = inches × 2.54Quick-reference conversion table: cm to inches
| Centimeters (cm) | Inches (in) | Fractional inches (approx.) |
|---|---|---|
| 1 cm | 0.3937 in | just under 3/8" |
| 2 cm | 0.7874 in | about 13/16" |
| 5 cm | 1.9685 in | just under 2" |
| 10 cm | 3.9370 in | just under 4" |
| 25 cm | 9.8425 in | just under 9 7/8" |
| 50 cm | 19.6850 in | just under 19 11/16" |
| 100 cm | 39.3701 in | 39 3/8" (about 3 ft 3 in) |
Other ways people ask this question
People look this up in many ways — they all come down to the same calculation:
- "How many inches in X centimeters?" — same formula, divide by 2.54.
- "Convert millimeters to inches" — divide mm by 25.4 (or convert mm to cm first, then divide by 2.54).
- "Centimeters to feet and inches" — divide cm by 2.54 to get total inches, then divide by 12 for feet and keep the remainder as inches.
- "What is X cm in imperial?" — imperial length uses inches, feet, and yards; this converter gives you the inch value as a first step.
- "Convert height from cm to inches" — exactly the same formula; just enter your height in cm and read off the inches.
Quick tips and common mistakes
- Don't confuse cm and mm. 10 mm = 1 cm. If your ruler shows millimeters, divide by 10 first.
- Rounding matters for precision work. Use 4 decimal places for engineering or cutting; 1–2 is fine for everyday shopping or travel.
- Screen sizes use diagonal inches. When converting a monitor or TV screen stated in cm, you are converting the diagonal measurement — the formula is the same.
- Clothing sizes vary by brand. A waist listed as 76 cm converts to about 29.9 inches, but always check the brand's own size chart too.
- 1 foot = 30.48 cm exactly — handy to remember when estimating without a calculator.
Every calculation runs locally in your browser using the exact 2.54 factor — your numbers are never uploaded or stored anywhere.
Enter any centimeter value in the converter above to get your answer in seconds.