inch to cm Converter - Inch to Centimeter
Inch (in) (inch) to Centimeter (cm)
Direct answer
1 inch = 2.54 cm
cm = inch × 2.54
Converter
Conversion formula
cm = inch × 2.54
inch = cm × 0.393700787402
Example: 10 inch = 10 × 2.54 = 25.4 cm.
Common conversion table
| inch | cm |
|---|---|
| 1 inch | 2.54 cm |
| 2 inch | 5.08 cm |
| 5 inch | 12.7 cm |
| 10 inch | 25.4 cm |
| 20 inch | 50.8 cm |
| 50 inch | 127 cm |
| 100 inch | 254 cm |
| 1,000 inch | 2,540 cm |
Conversion derivation
Express both inch and cm in the same base unit m (meter), then cancel the shared base unit.
- 1
Rewrite inch in the base unit
- 2
Rewrite cm in the base unit
- 3
Forward conversion
- 4
Reverse conversion
AI explanation for this conversion
This pre-generated explanation is schema-checked. Numeric results still come from the page formula and calculator.
Why the inch to centimeter conversion factor holds
The conversion factor of 2.54 centimeters per inch is a defined value. It arises because the international inch is defined as exactly 25.4 millimeters, which is 2.54 centimeters.
Definition
An inch (in) is a unit of length in the imperial and US customary systems. A centimeter (cm) is a unit of length in the metric system, equal to one hundredth of a meter.
Principle
Both units can be expressed in the base unit of meter (m). The conversion factor is derived by taking the ratio of their meter definitions: 0.0254 m per inch divided by 0.01 m per centimeter.
Assumptions
- The conversion relies on the exact definitions: 1 inch = 0.0254 meter and 1 cm = 0.01 meter.
Cautions
- This conversion is for the international inch. Historical or survey inches may have slightly different values.
- For practical conversions, round the result to the precision required by your calculation.
FAQ
How many cm are in 1 inch?
1 inch = 2.54 cm.
How many cm are in 10 inch?
10 inch = 25.4 cm.
How many cm are in 100 inch?
100 inch = 254 cm.
What is the formula to convert inch to cm?
Use cm = inch × 2.54.
How many inch are in 1 cm?
1 cm = 0.393700787402 inch.
What should I check when converting inch to cm?
Use the conversion factor and round the result to the precision required by your calculation.