Cm to Inches Converter
Instantly convert centimetres to inches with our free, lightning-fast calculator. Perfect for DIY, tailoring, and converting UK to US measurements.
Formula
inches = cm ÷ 2.54
Common Conversions
How to Convert Centimetres to Inches
1 cm = 0.3937 inches. Divide centimetres by 2.54 (or multiply by 0.3937) to get inches. So 30 cm ÷ 2.54 = 11.81 in. The inch is defined as exactly 2.54 cm by international agreement (1959), so the conversion is precise.
Quick mental method: divide by 2.5. 30 cm ÷ 2.5 = 12 in (exact value 11.81 - within 1.6%). 100 cm ÷ 2.5 = 40 in (exact 39.37). Useful for height comparisons - 180 cm = 70.87 in = 5'10", a typical adult male height.
Common Centimetres to Inches Conversions
| Centimetres | Inches |
|---|---|
| 1 cm | 0.39 in |
| 10 cm | 3.94 in |
| 30 cm | 11.81 in |
| 50 cm | 19.69 in |
| 100 cm (1 m) | 39.37 in |
| 152 cm (5 ft) | 59.84 in |
| 180 cm | 70.87 in |
| 200 cm | 78.74 in |
Frequently Asked Questions
Is 2.54 cm exactly 1 inch?
Yes, by international agreement since 1959. The international yard and pound agreement defines the inch as exactly 2.54 cm. So the conversion is mathematically exact, not approximate.
What is 5'10" in centimetres?
5 feet 10 inches = 70 inches = 177.8 cm. Common adult male height. 5'5" (typical adult female) = 165.1 cm. 6 ft = 182.88 cm.
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