Inches to CM Converter
Convert inches to centimeters instantly. Type any value below and get the exact result — no rounding, no guessing.
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Millimeters
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Meters
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Feet
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Yards
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How to Convert Inches to CM
The formula is simple — multiply the number of inches by 2.54 to get centimeters.
cm = inches × 2.54
For example: 5 inches × 2.54 = 12.7 cm. This works because 1 inch is defined as exactly 2.54 centimeters — it is not an approximation, it is the official international standard.
Inches to CM Conversion Chart
The most commonly searched inch-to-centimeter conversions, all in one place.
| Inches | Centimeters | Millimeters | Feet |
|---|---|---|---|
| 1 in | 2.54 cm | 25.4 mm | 0.083 ft |
| 2 in | 5.08 cm | 50.8 mm | 0.167 ft |
| 3 in | 7.62 cm | 76.2 mm | 0.25 ft |
| 4 in | 10.16 cm | 101.6 mm | 0.333 ft |
| 5 in | 12.7 cm | 127 mm | 0.417 ft |
| 6 in | 15.24 cm | 152.4 mm | 0.5 ft |
| 7 in | 17.78 cm | 177.8 mm | 0.583 ft |
| 8 in | 20.32 cm | 203.2 mm | 0.667 ft |
| 9 in | 22.86 cm | 228.6 mm | 0.75 ft |
| 10 in | 25.4 cm | 254 mm | 0.833 ft |
| 12 in | 30.48 cm | 304.8 mm | 1 ft |
| 18 in | 45.72 cm | 457.2 mm | 1.5 ft |
| 24 in | 60.96 cm | 609.6 mm | 2 ft |
| 36 in | 91.44 cm | 914.4 mm | 3 ft |
| 48 in | 121.92 cm | 1219.2 mm | 4 ft |
| 60 in | 152.4 cm | 1524 mm | 5 ft |
| 72 in | 182.88 cm | 1828.8 mm | 6 ft |
Common Inch Measurements in CM
Smartphone screen
6 inches = 15.24 cm
Credit card width
3.37 inches = 8.56 cm
A4 paper width
8.27 inches = 21 cm
Standard door height
80 inches = 203.2 cm
Ruler length
12 inches = 30.48 cm
Average male height
69 inches = 175.26 cm
Frequently Asked Questions
How many cm is 1 inch?
1 inch is exactly 2.54 centimeters. This is the official international standard — not an approximation. So if you have 1 inch, you have precisely 2.54 cm.
How many cm is 5 inches?
5 inches equals 12.7 centimeters. You get this by multiplying 5 × 2.54 = 12.7. A good real-life reference is that 5 inches is roughly the width of a dollar bill.
Is 1 inch exactly 2.54 cm?
Yes — since 1959, 1 inch has been defined as exactly 2.54 centimeters under the international yard and pound agreement. It is a fixed definition, not a rounded approximation.
How do I convert inches to cm without a calculator?
Multiply the inches by 2.5 for a quick estimate — it is close enough for most practical purposes. For example, 4 inches × 2.5 = 10 cm. The exact answer is 10.16 cm, so you are only off by about 1.5%.
How many cm is 6 feet in inches?
6 feet equals 72 inches, which converts to 182.88 centimeters. This is why 6 feet tall is often considered a benchmark height — it works out to almost exactly 183 cm.