20 Inches to Centimetres
20 inches is exactly 50.8 cm.
20 inches = 50.8 cm
Type in either box. Inches also take fractions and feet: 1 1/2, 3/4, 5'7", 5 ft 7 in.
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Inches, as a fraction
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Feet and inches
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Millimetres
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Metres
How to convert 20 inches to cm
Multiply by 2.54, the exact number of centimetres in an inch:
20 in × 2.54 = 50.8 cm
No rounding is involved — the inch is defined as 2.54 cm, so 50.8 cm is the exact answer, not an approximation. In millimetres that is 508 mm, and in metres 0.508 m.
20 inches in other units
| Centimetres | 50.8 cm |
| Millimetres | 508 mm |
| Metres | 0.508 m |
| Feet and inches | 1 ft 8 in |
| Feet | 1.6667 ft |
Inches to cm near 20
| Inches | Centimetres |
|---|---|
| 15 in | 38.1 cm |
| 16 in | 40.64 cm |
| 17 in | 43.18 cm |
| 18 in | 45.72 cm |
| 20 in | 50.8 cm |
| 24 in | 60.96 cm |
| 27 in | 68.58 cm |
| 32 in | 81.28 cm |
| 36 in | 91.44 cm |
Need a different value? Type it into the converter above, or go back to the full cm to inches converter.
Frequently asked questions
How many centimetres is 20 inches?
20 inches is exactly 50.8 centimetres. One inch is defined as 2.54 cm, so multiply 20 by 2.54.
How do I estimate 20 inches in cm without a calculator?
Multiply by 2.5, then add a little: 20 × 2.5 = 50, and the exact answer of 50.8 cm is 1.6% higher. For most everyday purposes, 2.5 is close enough.