Centimeters ⇄ Inches Converter
Quickly convert metric and imperial length measurements with a live calculator, formula guide, quick reference table, and FAQs.
Centimeters ⇄ Inches Converter
Fast and accurate conversion between metric and imperial units
Quick Reference
Common conversions for everyday use
How to Convert Manually
Centimeters to inches: divide the centimeter value by 2.54, because 1 inch = 2.54 cm.
Inches to centimeters: multiply the inch value by 2.54.
| cm | in | cm | in |
|---|---|---|---|
| 1 | 0.39 | 10 | 3.94 |
| 15 | 5.91 | 20 | 7.87 |
| 30 | 11.81 | 50 | 19.69 |
| 75 | 29.53 | 100 | 39.37 |
Frequently Asked Questions
1. How do I convert centimeters to inches?
Divide the centimeter value by 2.54. Example: 10 cm ÷ 2.54 = 3.94 in.
2. What is the formula for inches to centimeters?
Multiply inches by 2.54. Example: 5 in × 2.54 = 12.7 cm.
3. How many inches are in 1 cm?
Exactly 0.393700787 inches, which is usually rounded to 0.39 in.
4. How many centimeters are in 1 inch?
Exactly 2.54 centimeters.
5. What is 5 cm in inches?
5 cm ÷ 2.54 = 1.97 inches.
6. What is 10 cm in inches?
10 cm ÷ 2.54 ≈ 3.94 inches.
7. What is 30 cm in inches?
30 cm ÷ 2.54 ≈ 11.81 inches.
8. How many inches is 50 cm?
50 cm ÷ 2.54 ≈ 19.69 inches.
9. How many inches are in 100 cm?
100 cm ÷ 2.54 = 39.37 inches.
10. How many centimeters are in 12 inches?
12 in × 2.54 = 30.48 cm.
11. How do I convert height from cm to feet and inches?
First divide centimeters by 2.54 to get total inches, then divide that result by 12 to convert to feet and remaining inches.
12. How many inches is 170 cm?
170 cm ÷ 2.54 ≈ 66.93 inches.
13. Can I convert inches to cm without a calculator?
Yes. For a rough estimate, double the inches and add a little more. For exact conversion, always multiply by 2.54.
14. Is 1 inch exactly 2.54 cm?
Yes. That is the exact international standard conversion.
15. Why is 2.54 used in conversions?
Because one international inch is officially defined as exactly 2.54 centimeters.
16. Do the UK and Canada use inches or centimeters?
Both officially use metric in most contexts, but inches are still common informally for items like screens and height.
17. What is 2 inches in cm?
2 × 2.54 = 5.08 cm.
18. What is 0.5 inches in cm?
0.5 × 2.54 = 1.27 cm.
19. How accurate is this converter?
It uses the exact 2.54 conversion factor and displays clean decimal results.
20. How do I convert cm to fractions of an inch?
First convert cm to decimal inches by dividing by 2.54, then round to the nearest common fraction such as 1/4, 1/2, or 3/4.