Inches to Millimeters Converter
Need to convert inches to millimeters fast? You're in the right place. Use the converter below to instantly get results, see conversion formulas, and check popular values – all in one place.
Want to convert millimeters to inches instead? Try our mm to inches converter.
How to Convert inches to mm
To convert inches to millimeters, multiply the number of inches by 25.4. This is because one inch equals exactly 25.4 millimeters.
Formula: millimeters = inches × 25.4
Example: 10 in × 25.4 = 254 mm
Inches to Millimeters Conversion Table
| Inches (in) | Millimeters (mm) |
|---|---|
| 1 in | 25.4 mm |
| 5 in | 127 mm |
| 10 in | 254 mm |
| 15 in | 381 mm |
| 20 in | 508 mm |
| 25 in | 635 mm |
| 30 in | 762 mm |
| 50 in | 1270 mm |
| 100 in | 2540 mm |
What is an Inch?
An inch (in) is a unit of length in the imperial and US customary systems. One inch equals exactly 25.4 millimeters. Inches are commonly used in the United States and other countries that haven't adopted the metric system.
What is a Millimeter?
A millimeter (mm) is a unit of length in the metric system. It equals one thousandth of a meter. Millimeters are commonly used to measure very small distances, such as the thickness of a credit card or the diameter of a wire.
FAQ – Inches to Millimeters
- How many millimeters is 1 inch?
- 1 inch is exactly 25.4 millimeters.
- How do you convert 10 inches to millimeters?
- Multiply 10 by 25.4. The result is 254 millimeters.
- Is 1 inch exactly 25.4 mm?
- Yes, by international agreement, 1 inch is defined as exactly 25.4 mm.
- Can I use this converter on mobile?
- Yes! This converter is mobile-friendly and works on any device.
- Is this tool free?
- Absolutely. You can use this converter as much as you like – it's completely free.
Looking to convert the other way? Try our millimeters to inches converter.