Instant Unit Conversion
Convert Centimeters to Inches (cm to in)
Exact formula, conversion factors, live calculator, and reference charts for centimeters to inches.
Method reviewed:Exact defined factors — international yard and pound (1959), US customary gallon and cup, SI — the values NIST SP 811 lists · reviewed September 2026 · Source: NIST SP 811
1 centimeter is equal to approximately 0.393701 inches. To convert centimeters to inches, divide your length by 2.54.
Live Centimeters to Inches Calculator
in = cm / 2.54Open full length converter →Centimeters to Inches Conversion Table
Quick reference conversion chart from 1 to 100 centimeters.
| Centimeters (cm) | Inches (in) | Mathematical Formula |
|---|---|---|
| 1 cm | 0.3937 in | 1 × 0.393701 |
| 2 cm | 0.7874 in | 2 × 0.393701 |
| 5 cm | 1.9685 in | 5 × 0.393701 |
| 10 cm | 3.937 in | 10 × 0.393701 |
| 15 cm | 5.9055 in | 15 × 0.393701 |
| 20 cm | 7.874 in | 20 × 0.393701 |
| 25 cm | 9.8425 in | 25 × 0.393701 |
| 50 cm | 19.685 in | 50 × 0.393701 |
| 75 cm | 29.5276 in | 75 × 0.393701 |
| 100 cm | 39.3701 in | 100 × 0.393701 |
Frequently Asked Questions
How many inches is 1 cm?
1 cm equals approximately 0.3937 inches. Exactly 1 inch is defined as 2.54 cm.
How do you convert cm to inches without a calculator?
Divide by 2.5 for a fast estimate (30 cm ÷ 2.5 = 12 in; exact is 11.81 in). For a closer mental result, divide by 2.54 directly — or multiply by 0.39.
What is 180 cm in feet and inches?
180 cm is 70.87 inches — 5 feet 10.9 inches, usually rounded to 5′11″. US height and screen listings round to the nearest inch.