Loading...
Convert centimeters (cm) to inches (in) instantly. Full chart from 1–250 cm with formula and reverse direction.
A centimeter (cm) is one-hundredth of a meter; an inch (in) is a US/UK customary unit defined as exactly 2.54 cm. To convert cm to in, divide by 2.54; to convert in to cm, multiply by 2.54.
1 cm equals 0.3937 in.
| Centimeters (cm) | Inches (in) |
|---|---|
| 1 cm | 0.3937 in |
| 2 cm | 0.7874 in |
| 3 cm | 1.181 in |
| 5 cm | 1.969 in |
| 8 cm | 3.150 in |
| 10 cm | 3.937 in |
| 12 cm | 4.724 in |
| 15 cm | 5.906 in |
| 18 cm | 7.087 in |
| 20 cm | 7.874 in |
| 21 cm | 8.268 in |
| 25 cm | 9.843 in |
| 30 cm | 11.811 in |
| 35 cm | 13.780 in |
| 40 cm | 15.748 in |
| 50 cm | 19.685 in |
| 60 cm | 23.622 in |
| 75 cm | 29.528 in |
| 100 cm | 39.370 in |
| 120 cm | 47.244 in |
| 150 cm | 59.055 in |
| 160 cm | 62.992 in |
| 170 cm | 66.929 in |
| 180 cm | 70.866 in |
| 200 cm | 78.740 in |
| 250 cm | 98.425 in |
Chart values use the exact conversion factor 1 in = 2.54 cm, rounded for display.
Formula
in = cm ÷ 2.54 | cm = in × 2.54cm = centimeter — SI unit, 1/100th of a meter (1 cm = 10 mm)
in = inch — US/UK customary unit (1 in = 2.54 cm, exact since 1959)
Worked Example
Convert 30 cm to inches
Did you know? Before 1959, the US inch was based on the survey foot (≈25.40005 mm) and the British inch on the imperial foot (≈25.39997 mm). The International Yard and Pound Agreement that year fixed both at exactly 25.4 mm, eliminating a tiny but cumulative manufacturing-tolerance headache.
Sources
Convert between square feet, square meters, acres, hectares, and more with quick reference tables.
Convert bra sizes between US, UK, EU, AU, and FR/IT systems. Enter band and cup size to see all equivalents.
Convert cups to US quarts. Chart, formula, and reverse direction.
Convert between joules, calories, kWh, BTU, and more. Includes food calorie conversions.
Convert feet (ft) to meters (m) instantly. Chart, height conversions, and reverse direction.
Convert fluid ounces to US gallons. Chart, formula, and reverse direction.