18 Inches to Centimetres
18 inches is exactly 45.72 cm.
18 inches = 45.72 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 18 inches to cm
Multiply by 2.54, the exact number of centimetres in an inch:
18 in × 2.54 = 45.72 cm
No rounding is involved — the inch is defined as 2.54 cm, so 45.72 cm is the exact answer, not an approximation. In millimetres that is 457.2 mm, and in metres 0.4572 m.
18 inches in other units
| Centimetres | 45.72 cm |
| Millimetres | 457.2 mm |
| Metres | 0.4572 m |
| Feet and inches | 1 ft 6 in |
| Feet | 1.5 ft |
Inches to cm near 18
| Inches | Centimetres |
|---|---|
| 14 in | 35.56 cm |
| 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 |
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 18 inches?
18 inches is exactly 45.72 centimetres. One inch is defined as 2.54 cm, so multiply 18 by 2.54.
How do I estimate 18 inches in cm without a calculator?
Multiply by 2.5, then add a little: 18 × 2.5 = 45, and the exact answer of 45.72 cm is 1.6% higher. For most everyday purposes, 2.5 is close enough.