Conversions
Inches to Centimeters Calculator
Convert inches to centimeters and back. Live update as you type. Quick reference table for the most common sizes.
Convert
Formula: 1 inch = 2.54 cm exactly. Multiply inches by 2.54 to get centimeters; divide centimeters by 2.54 to get inches.
Inches to centimeters formula
Inches to Centimeters
Variables
Centimeters-Result in centimeters
Inches-Input value in inches
Length Conversion Table
| Centimeters | Inches | Feet |
|---|---|---|
| 1 cm | 0.39 | 0.03 |
| 2 cm | 0.79 | 0.07 |
| 3 cm | 1.18 | 0.1 |
| 4 cm | 1.57 | 0.13 |
| 5 cm | 1.97 | 0.16 |
| 6 cm | 2.36 | 0.2 |
| 9 cm | 3.54 | 0.3 |
| 12 cm | 4.72 | 0.39 |
| 18 cm | 7.09 | 0.59 |
| 24 cm | 9.45 | 0.79 |
| 36 cm | 14.17 | 1.18 |
| 48 cm | 18.9 | 1.57 |
| 60 cm | 23.62 | 1.97 |
| 72 cm | 28.35 | 2.36 |
Frequently Asked Questions about the Inches to Centimeters Calculator
How many centimeters are in an inch?
There are exactly 2.54 centimeters in one inch. That conversion factor has been fixed by international agreement since 1959 and is the same in the US, UK, Canada, and Australia.
What is 1 inch in cm?
1 inch is exactly 2.54 cm, which is also 25.4 mm or 0.0254 m. The calculator returns all three metric equivalents at once so you can pick the unit that fits your context.
How do I convert inches to cm without a calculator?
Multiply your inch value by 2.54. For a quick mental shortcut, multiply by 2.5 then add 1.6% of the result - that gets you within rounding error for most everyday measurements. Example: 10 inches x 2.54 = 25.4 cm.
How do I convert cm to inches?
Divide centimeters by 2.54. For a rough mental check, divide by 2.5 and shave off about 1.6%. Example: 100 cm / 2.54 = 39.3701 inches, which the calculator rounds to 4 decimal places.
Is an inch the same in the US, UK, and Canada?
Yes. The international inch (2.54 cm exactly) has been the standard in all major English-speaking countries since 1959. The old US Survey inch was 2.540005... cm - a tiny difference used only in legacy land-survey work, not in everyday or engineering contexts.
What is 5 feet 9 inches in cm?
5 feet 9 inches is 69 total inches. Multiply by 2.54 to get 175.26 cm. To convert any height, first convert feet to inches (multiply by 12), add the remaining inches, then multiply the total by 2.54.
Why use the metric system at all?
Metric units are based on powers of 10, so moving between millimeters, centimeters, and meters is simple arithmetic with no conversion fractions. Every country except the US, Liberia, and Myanmar uses the metric system as its official standard, which makes metric the practical choice for science, medicine, and international trade.