How do you convert centimeters to inches?
Divide centimeters by 2.54 to get inches — one inch is exactly 2.54 centimeters (or multiply inches by 2.54 to get centimeters). Example: 30 cm ÷ 2.54 = 11.81 in, about 11¾ in. And 100 cm (1 meter) ÷ 2.54 = 39.37 in.
Source: Unit conversion (1 in = 2.54 cm) · Verify against your AHJ and the adopted code edition.
One inch is defined as exactly 2.54 centimeters, so:
inches = centimeters ÷ 2.54 (and centimeters = inches × 2.54)
Common values:
| Centimeters | Inches |
|---|---|
| 2.54 cm | 1 in |
| 10 cm | 3.94 in |
| 30 cm | 11.81 in (≈ 11¾ in) |
| 100 cm (1 m) | 39.37 in |
Because the factor is exact, the conversion is precise — no rounding built in until you round the answer. For fieldwork, “cm ÷ 2.5” is close enough to eyeball (it runs about 1.5% high).
Work it out: the feet-inch-fraction converter
parses metric input like 30 cm and returns inches to the nearest fraction,
plus decimal inches and feet-and-inches.