Free Online Inches to CM
Inches to centimetres is a fixed-ratio conversion: 1 inch = 2.54 cm exactly. Type into either field and the other updates instantly.
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How to Use This Converter
- Type a value into either the Inches or Centimetres field.
- The other field updates instantly using the exact 2.54 factor.
- Clear a field to start over.
What Is an Inches to CM?
The international inch was pinned at exactly 2.54 cm in the 1959 yard-and-pound agreement, which makes this one of the few conversions that's exact rather than rounded. 1 in = 2.54 cm, 1 cm = 0.393700787... in.
Specific use cases drive the traffic here: laptop and TV screen diagonals (a 13.3-inch screen is exactly 33.782 cm; a 65-inch TV is 165.1 cm), height shown on a US driving licence converted to metric for an EU form (5'10" = 70 in = 177.8 cm) and paper sizes when comparing US Letter (8.5 × 11 in) against A4 (21 × 29.7 cm).
For other length units in the same calculation (feet, miles, yards), the broader length converter is faster.
Frequently Asked Questions
How many cm in an inch?
Screen size conversion?
Height conversion?
Published by the WeGotEveryTool team. We build and test every tool in-house and update pages when the underlying spec, formula, or recommendation changes.
Reviewed: May 2026. Disclaimer: this tool is provided as-is for general informational use. For decisions with material consequences (medical, legal, financial, security) verify results against a qualified professional source.
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