Centimeters ⇄ Inches Converter 2025
Quickly switch between metric and imperial measurements with the live calculator, handy reference table, and expert-answered FAQs.
Centimeters ⇄ Inches Converter
Fast and accurate length conversion between metric and imperial units
Quick Reference
Common conversions for everyday use
How to convert manually
Centimeters to inches → divide by 2.54 (because 1 inch = 2.54 cm).
Inches to centimeters → multiply 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’s 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 in (≈ 0.39 in).
4. How many centimeters are in 1 inch?
Exactly 2.54 cm.
5. What is 5 cm in inches?
5 cm ÷ 2.54 = 1.97 in.
6. What is 10 cm in inches?
10 cm ÷ 2.54 ≈ 3.94 in.
7. What is 30 cm in inches?
30 cm ÷ 2.54 ≈ 11.81 in.
8. How many inches is 50 cm?
50 cm ÷ 2.54 ≈ 19.69 in.
9. How many inches are in 100 cm?
100 cm ÷ 2.54 = 39.37 in.
10. How many centimeters are in 12 inches?
12 in × 2.54 = 30.48 cm.
11. How do I convert my height from cm to feet and inches?
First divide cm by 2.54 to get total inches, then divide by 12 for feet. Example: 170 cm = 66.93 in = 5 ft 6.93 in.
12. How many inches is 170 cm?
170 cm ÷ 2.54 ≈ 66.93 in.
13. Can I convert inches to cm without a calculator?
Yes—double the inches (×2) and add roughly 5 % to get a close estimate. For exact numbers use × 2.54.
14. Is 1 inch exactly 2.54 cm?
Yes, it’s an international standard agreed in 1959.
15. Why is 2.54 used in conversions?
Because that’s the precise metric length defined for 1 international inch.
16. Do the UK and Canada use inches or centimeters?
Both countries legally use metric for most applications, but inches persist informally (e.g., screen sizes, human height).
17. What is 2 inches in cm?
2 in × 2.54 = 5.08 cm.
18. What is 0.5 inches in cm?
0.5 in × 2.54 = 1.27 cm.
19. How accurate is this online converter?
The tool uses the exact 2.54 factor, so results are precise to the decimal precision you enter.
20. How do I convert cm to fractions of an inch?
Convert to decimal inches first (cm ÷ 2.54), then match to the nearest common fraction (e.g., 0.25 = ¼ in, 0.5 = ½ in).
