CM to Inches converter
1 cm = 0.393700787402 in
The inch has been exactly 2.54 cm since 1 July 1959, so dividing by 2.54 is not an approximation. Screen sizes, waist sizes and printer paper are the usual reasons people need this one.
30 cm = 11.81102362 in
Formula: in = cm ÷ 2.54
30 cm in every length unit
- millimetre
- metre
- kilometre
- inch
- foot
- yard
- mile
- nautical mile
How to convert centimetres to inches
in = cm ÷ 2.54
Example: 30 cm × 0.393700787402 = 11.81102362 in.
centimetre: 1 cm = 0.01 m (BIPM SI Brochure)
inch: 1 in = 2.54 cm exactly (NIST SP 811, App. B (1959 yard & pound agreement))
Going the other way? Use the inches to cm converter.
Where the number 0.39370079 comes from
Nothing is measured here. Every step below is a definition written into law or into the SI.
1 cm
CM to Inches table
| centimetres (cm) | inches (in) | Also written |
|---|---|---|
| 1 | 0.3937008 | |
| 2 | 0.7874016 | |
| 3 | 1.181102 | |
| 4 | 1.574803 | |
| 5 | 1.968504 | |
| 6 | 2.362205 | |
| 7 | 2.755906 | |
| 8 | 3.149606 | |
| 9 | 3.543307 | |
| 10 | 3.937008 | |
| 11 | 4.330709 | |
| 12 | 4.724409 | |
| 13 | 5.11811 | |
| 14 | 5.511811 | |
| 15 | 5.905512 | |
| 16 | 6.299213 | |
| 17 | 6.692913 | |
| 18 | 7.086614 | |
| 19 | 7.480315 | |
| 20 | 7.874016 | |
| 21 | 8.267717 | |
| 22 | 8.661417 | |
| 23 | 9.055118 | |
| 24 | 9.448819 | |
| 25 | 9.84252 | |
| 26 | 10.23622 | |
| 27 | 10.62992 | |
| 28 | 11.02362 | |
| 29 | 11.41732 | |
| 30 | 11.81102 | |
| 35 | 13.77953 | 1 ft 1.8 in |
| 40 | 15.74803 | 1 ft 3.7 in |
| 45 | 17.71654 | 1 ft 5.7 in |
| 50 | 19.68504 | 1 ft 7.7 in |
| 60 | 23.62205 | 1 ft 11.6 in |
| 70 | 27.55906 | 2 ft 3.6 in |
| 80 | 31.49606 | 2 ft 7.5 in |
| 90 | 35.43307 | 2 ft 11.4 in |
| 100 | 39.37008 | 3 ft 3.4 in |
| 150 | 59.05512 | 4 ft 11.1 in |
| 200 | 78.74016 | 6 ft 6.7 in |
Questions
How many inches are in 1 centimetre?
1 cm = 0.393700787402 in.
What is the formula to convert centimetres to inches?
in = cm ÷ 2.54. 1 cm = 0.01 m; 1 in = 2.54 cm exactly.
Is this conversion exact?
Yes. Both units are defined exactly (BIPM SI Brochure; NIST SP 811, App. B (1959 yard & pound agreement)), so the factor is exact and results are only rounded for display.
What is 30 cm in in?
30 cm = 11.81102362 in.