Length
cm to Inches Converter Chart
Use this cm to inches converter chart to turn centimeters into inches instantly, with a quick reference table of common values.
How to convert cm to inches
One inch is defined as exactly 2.54 centimeters, so to convert any length you simply divide the number of centimeters by 2.54:
- inches = cm ÷ 2.54
- To go the other way: cm = inches × 2.54
For example, 10 cm ÷ 2.54 = 3.937 inches, and a standard A4 sheet at 21 cm wide works out to 8.27 inches. Type any centimeter value above and the inch result, the 0–30 cm progress bar and the chart all update instantly.
cm to inches converter chart
This cm to inches converter chart covers the values people look up most often, from a single centimeter up to a full meter. Bookmark it as a quick reference whenever you need a fast centimeters-to-inches answer without typing:
| Centimeters (cm) | Inches (in) | Inches (rounded) |
|---|---|---|
| 1 cm | 0.394" | ~3/8" |
| 5 cm | 1.969" | ~2" |
| 10 cm | 3.937" | ~4" |
| 15 cm | 5.906" | ~6" |
| 20 cm | 7.874" | ~8" |
| 25 cm | 9.843" | ~10" |
| 30 cm | 11.811" | ~12" (1 ft) |
| 50 cm | 19.685" | ~20" |
| 100 cm | 39.370" | ~39 1/3" |
Why 2.54 is the magic number
Since 1959 the inch has been internationally standardized as exactly 2.54 centimeters, which makes the conversion precise rather than approximate. A handy mental shortcut is that 1 cm is a little under four-tenths of an inch, so you can estimate quickly by multiplying centimeters by 0.4 before reaching for the exact figure.
Frequently asked questions
How many inches is 10 cm?
10 cm equals 3.937 inches, because inches = cm ÷ 2.54. That is just under 4 inches.
What is the formula to convert cm to inches?
Divide centimeters by 2.54: inches = cm ÷ 2.54. To reverse it, multiply inches by 2.54 to get centimeters.
How many cm are in 1 inch?
Exactly 2.54 cm. The inch has been internationally defined as 2.54 centimeters since 1959.
Is there a quick way to estimate cm to inches in my head?
Yes — multiply the centimeters by 0.4 for a rough answer. For example 25 cm × 0.4 ≈ 10 inches (the exact value is 9.843").
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