Updated · Built and checked by the PlinzoTools team, formulas tested against published sources
Convert Inches to CM instantly with an exact, accurate formula -- no sign-up, no ads blocking the result.
Converting Inches to CM means multiplying by an exact, fixed constant (2.54) rather than an approximation -- the same factor this calculator uses internally. Length is one of the most commonly converted measurement types, since the US customary system (inches, feet, yards, miles) and the metric system (centimeters, meters, kilometers) are both in everyday use worldwide, and construction, travel, shipping, and international specs constantly require translating between them. One centimeter equals exactly 0.01 meters, or about 0.393701 inches. One inch is defined as exactly 2.54 centimeters (25.4 millimeters).
Enter your value and confirm the "From Unit" dropdown is set to Inches -- the result grid updates instantly, showing your value converted into every unit in this length category at once (not just CM), so you can see multiple equivalent measurements without switching tools. There's no button to press and nothing is sent to a server, so it works the same on a phone with no signal as it does on a desktop.
CM = Inches × 2.54
Modern length units are defined against the meter, the SI base unit for length -- the inch is fixed at exactly 0.0254 meters by international agreement (the 1959 international yard and pound agreement), which is why length conversions between US customary and metric units are exact, not approximated.
| Inches | CM |
|---|---|
| 1 | 2.54 |
| 5 | 12.7 |
| 10 | 25.4 |
| 50 | 127 |
| 100 | 254 |
Construction and DIY projects that mix US customary measurements (a tape measure) with metric specs (imported materials or international plans). Students and travelers converting distances between the US customary and metric systems. Shipping and manufacturing specs that require an exact unit match. For related conversions, see Inches to Fraction Calculator and Square Footage Calculator.
This calculator carries full precision internally and only rounds the final displayed result for readability -- if you need more or fewer decimal places than shown, the underlying value is still exact to the limits of floating-point arithmetic.
Multiply the Inches value by 2.54 to get CM. This calculator does that automatically as you type, so you don't need to do the multiplication by hand.
Yes -- 1 Inches equals 2.54 CM by definition, so the result is mathematically exact rather than a rounded estimate (the displayed value may be rounded for readability, but the underlying calculation isn't).
Yes -- change the "From Unit" dropdown above the input to switch direction. The same conversion engine handles every unit in this category, not just Inches and CM.
Exact -- the relationship between Inches and CM is a fixed international definition, not a measured approximation, so the underlying calculation carries full precision regardless of how the displayed result is rounded.
CM is one of the standard units for measuring length -- see the Practical Uses section above for the specific contexts where it's most commonly encountered.
100 inches equals 254 cm, using the same 2.54 factor as the rest of this page.
Multiplying a inches value by 2.54 gives you centimeters. The reverse conversion divides by 2.54, which is the same as multiplying by 0.3937008. For example, 12.5 inches × 2.54 = 31.75 centimeters, and 7 inches × 2.54 = 17.78 centimeters.
One inch is defined as exactly 2.54 centimeters (25.4 millimeters). One centimeter equals exactly 0.01 meters, or about 0.393701 inches.
| Inches | Centimeters |
|---|---|
| 1 | 2.54 |
| 2 | 5.08 |
| 3 | 7.62 |
| 5 | 12.7 |
| 10 | 25.4 |
| 15 | 38.1 |
| 20 | 50.8 |
| 25 | 63.5 |
| 50 | 127 |
| 75 | 190.5 |
| 100 | 254 |
| 250 | 635 |
| 500 | 1,270 |
| 1,000 | 2,540 |
How many centimeters are in 1 inches?
1 inches equals 2.54 centimeters.
How many inches are in 1 centimeters?
1 centimeters equals 0.3937008 inches.
What is 60 inches in centimeters?
60 inches equals 152.4 centimeters, using the same 2.54 factor as the rest of this chart.
Is this conversion exact or approximate?
The 2.54 factor comes from a fixed, exact definitional constant, so the underlying math is exact; the numbers on this page are rounded to seven significant digits for readability, and the calculator above keeps the full-precision value.
Values are rounded to seven significant digits for display; the converter above uses the full-precision factor.
Reference: NIST Weights and Measures