Inches to Cm Calculator
Inches ↔ centimeters both ways. Click any i for detail.
Length
Convert
i
Direction
Inches to centimeters, or the reverse. |
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|---|---|
Inches
i
in
Length in inches. |
|
Centimeters
i
cm
Length in centimeters. |
How to use this calculator
- Pick a direction.
- Enter the length.
- Read inches, cm, mm, and feet+inches.
Results explained
By definition, 1 inch = 2.54 cm exactly. Millimeters are cm × 10. The feet+inches breakdown helps tape-measure work. For human height entry, the height calculator may feel more natural.
Quick reference: in ↔ cm
1 in = 2.54 cm exactly.
| Item | Detail |
|---|---|
| 12 in | 30.48 cm |
| 1 cm | ≈ 0.3937 in |
| 1 mm | 0.1 cm |
| Height cousin | Height calculator (ft+in ↔ cm) |
Exact inch definition — no survey-foot ambiguity here.
How the estimate is built
cm = in × 2.54; in = cm / 2.54.
Example scenario
12 in → 30.48 cm.
FAQ
Why 2.54 and not 2.5?
2.54 is the international inch definition. 2.5 is a rough estimate.
Can I convert feet here?
Enter total inches (feet × 12), or use the feet-to-meters page for longer spans.
Is this for screen DPI?
No — that is pixel/aspect math. This is physical length only.
Fraction inches?
Enter decimals (1½ in = 1.5).