Convert Inches to Millimeters
Convert inches to millimeters online. Fast, accurate, and free unit converter.
How to Convert Inches to Millimeters
- Take the number of inches you want to convert.
- Multiply by 25.4 (the exact number of millimeters in one inch).
- The result is the measurement in millimeters.
Quick Reference
| Inches | Millimeters |
|---|---|
| 0.5 Inches | 12.7 Millimeters |
| 1 Inches | 25.4 Millimeters |
| 2 Inches | 50.8 Millimeters |
| 6 Inches | 152.4 Millimeters |
| 12 Inches | 304.8 Millimeters |
| 24 Inches | 609.6 Millimeters |
Use Cases
- •Converting pipe, bolt, or screw dimensions from inches to millimeters for metric hardware stores.
- •Expressing screen or sensor sizes in millimeters for international technical specifications.
- •Converting rainfall measurements or weather data between imperial and metric units.
Formula
To convert inches to millimeters, multiply the number of inches by 25.4.
Frequently Asked Questions
How many millimeters are in 1 inch?
1 inch = 25.4 millimeters.
How to convert 6 inches to mm?
6 × 25.4 = 152.4 mm.
How many mm is 0.5 inches?
0.5 × 25.4 = 12.7 mm.
How many mm is a quarter inch?
0.25 × 25.4 = 6.35 mm.
Why is 25.4 mm exactly equal to 1 inch?
This exact equivalence was established by international agreement in 1959 to standardize the imperial inch against the metric system.