How Many Centimeters in an Inch

Instant inch to centimeter conversion

⚡Quick Answer

1 inch = 2.54 centimeters (exactly). To convert inches to cm, multiply by 2.54.

2.54cm

1 inch = 2.54 centimeters. This is an exact conversion defined by international agreement since 1959.

💡This is one of the few conversions that's exactly defined, not rounded.

To convert inches to centimeters: cm = inches × 2.54. For example, 5 inches = 5 × 2.54 = 12.7 cm.

💡For rough estimates, multiply inches by 2.5 for a quick approximation.

1 inch = 2.54 cm | 2 inches = 5.08 cm | 6 inches = 15.24 cm | 12 inches (1 foot) = 30.48 cm

💡A foot is exactly 30.48 cm.

To convert cm to inches: inches = cm ÷ 2.54. For example, 10 cm = 10 ÷ 2.54 = 3.94 inches.

💡Or multiply cm by 0.3937 for the same result.

In 1959, the US, UK, and other countries agreed to define the inch as exactly 25.4 millimeters (2.54 cm) to standardize measurements internationally.

First convert feet to inches (feet × 12), add remaining inches, then multiply total by 2.54. Example: 5'10" = 70 inches = 177.8 cm.

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