Inches to MM Converter
Convert inches to millimeters using the exact international definition 1 inch = 25.4 millimeters. Multiply the inch measurement by 25.4 to calculate millimeters.
Quick conversion table
| Inches | Millimeters |
|---|---|
| 0.125 in | 3.175 mm |
| 0.25 in | 6.35 mm |
| 0.5 in | 12.7 mm |
| 1 in | 25.4 mm |
| 2 in | 50.8 mm |
| 3 in | 76.2 mm |
| 4 in | 101.6 mm |
| 6 in | 152.4 mm |
| 8 in | 203.2 mm |
| 10 in | 254 mm |
| 12 in | 304.8 mm |
How to use the Inches to MM Converter
- Enter the measurement in inches.
- The converter multiplies the inch value by exactly 25.4.
- You can enter whole numbers, decimals and supported fractional inch measurements.
- Choose the number of decimal places to display.
- Use quick values and the conversion table for common inch-to-millimeter measurements.
- Copy the result or use Swap to convert millimeters back to inches.
Examples
1 inch to mm
1 inch equals exactly 25.4 millimeters.
0.5 inch to mm
0.5 inch × 25.4 = exactly 12.7 mm.
2 inches to mm
2 inches × 25.4 = exactly 50.8 mm.
6 inches to mm
6 inches × 25.4 = exactly 152.4 mm.
12 inches to mm
12 inches × 25.4 = exactly 304.8 mm.
Frequently asked questions
How many millimeters are in one inch?
There are exactly 25.4 millimeters in one international inch.
What is the formula for inches to mm?
Multiply the number of inches by 25.4.
How many mm is half an inch?
Half an inch equals exactly 12.7 millimeters.
How many mm is 1/4 inch?
One quarter inch equals exactly 6.35 millimeters.
How many mm is 3/4 inch?
Three quarters of an inch equals exactly 19.05 millimeters.
How many mm is 2 inches?
Two inches equals exactly 50.8 millimeters.
How many mm is 10 inches?
Ten inches equals exactly 254 millimeters.
Can I convert mm back to inches?
Yes. Use the Swap button or open the dedicated MM to Inches Converter.
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