4 Inches to Centimetres
4 inches is exactly 10.16 cm.
4 inches = 10.16 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 4 inches to cm
Multiply by 2.54, the exact number of centimetres in an inch:
4 in × 2.54 = 10.16 cm
No rounding is involved — the inch is defined as 2.54 cm, so 10.16 cm is the exact answer, not an approximation. In millimetres that is 101.6 mm, and in metres 0.1016 m.
4 inches in other units
| Centimetres | 10.16 cm |
| Millimetres | 101.6 mm |
| Metres | 0.1016 m |
Inches to cm near 4
| Inches | Centimetres |
|---|---|
| 1 in | 2.54 cm |
| 2 in | 5.08 cm |
| 3 in | 7.62 cm |
| 4 in | 10.16 cm |
| 5 in | 12.7 cm |
| 6 in | 15.24 cm |
| 8 in | 20.32 cm |
| 10 in | 25.4 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 4 inches?
4 inches is exactly 10.16 centimetres. One inch is defined as 2.54 cm, so multiply 4 by 2.54.
How do I estimate 4 inches in cm without a calculator?
Multiply by 2.5, then add a little: 4 × 2.5 = 10, and the exact answer of 10.16 cm is 1.6% higher. For most everyday purposes, 2.5 is close enough.