Inches to Centimeters Conversion

Quick formula: cm = inches × 2.54 — with common conversions

⚡Quick Answer

1 inch = 2.54 centimeters exactly. Quick trick: multiply inches by 2.5 for a fast estimate. 12 inches (1 foot) = 30.48 cm.

2.54cm

cm = inches × 2.54 — This is an exact conversion, not an approximation!

💡2.54 is easy to remember: roughly 2.5 cm per inch.

1 inch = 2.54 cm | 6 inches = 15.24 cm | 12 inches (1 ft) = 30.48 cm | 36 inches (1 yd) = 91.44 cm

💡Remember: 1 foot = 30 cm (roughly) is a handy reference.

For fast estimates, multiply by 2.5. Example: 4 inches × 2.5 = 10 cm (actual: 10.16 cm).

💡Close enough for most everyday situations!

Convert 8 inches to cm: 8 × 2.54 = 20.32 cm.

💡For screen sizes: a 27-inch monitor is about 68.5 cm diagonal.

Since 1959, the inch has been defined internationally as exactly 2.54 centimeters. This is not an approximation.

Divide centimeters by 2.54. For quick math: cm × 0.4 gives a rough estimate in inches.

1 foot = 12 inches = 30.48 cm. Round to 30 cm for quick mental math.

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