Step by step
- Take your measurement in centimeters and divide it by 2.54 to get inches.
- For quick mental math, divide by 2.5 or multiply by 0.4, then adjust slightly down.
- To convert inches to centimeters, multiply the inch value by 2.54.
- Or type the number into the Value box on this page and press Swap units to switch directions.
At a glance
| Conversion | Exact Formula | Example |
|---|---|---|
| CM to inches | cm / 2.54 | 10 cm = 3.937 in |
| Inches to cm | in × 2.54 | 10 in = 25.4 cm |
| Feet and inches | (cm / 2.54) mod 12 | 170 cm = 5 ft 6.93 in |
| Fractional inches | (num / den) × 2.54 | 3/4 in = 1.905 cm |
Related questions
What is the cm to inches formula?
The exact formula is inches = centimeters ÷ 2.54. Because 1 inch equals exactly 2.54 cm, there is no rounding error in the conversion factor.
How do I convert inches to cm?
Multiply the number of inches by 2.54. For example, 5 inches × 2.54 = 12.7 cm, and 12 inches × 2.54 = 30.48 cm.
How can I convert cm to inches without a calculator?
Divide the centimeters by 2.5 for a close estimate, or multiply by 4 and divide by 10. For example, 50 cm × 0.4 = 20 inches (exact is 19.69 in).
Is 1 cm equal to 0.39 inches?
Yes, 1 cm is approximately 0.3937 inches (1 ÷ 2.54). Rounding to 0.39 is fine for rough estimates, but use 2.54 for exact measurements.
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Open the full cm to inches converter →
Updated November 14, 2026.