1 inch = 25.4 millimeters
All conversions
| Unit | Symbol | Value |
|---|
How to Convert Inches to MM
The formula is millimeters = inches × 25.4. 1 inch = 25.4 millimeters. Type any value in the converter above for an instant answer, or use the chart below for the most common values.
This page is preset for inch to millimeter conversions, but you can switch either list to any of the 92 units in the Length Converter, or go the other way with the MM to Inches converter.
Inches to MM conversion chart
| Inches | MM |
|---|---|
| 0.1 in | 2.54 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 |
| 5 in | 127 mm |
| 6 in | 152.4 mm |
| 7 in | 177.8 mm |
| 8 in | 203.2 mm |
| 9 in | 228.6 mm |
| 10 in | 254 mm |
| 11 in | 279.4 mm |
| 12 in | 304.8 mm |
| 13 in | 330.2 mm |
| 14 in | 355.6 mm |
| 15 in | 381 mm |
| 16 in | 406.4 mm |
| 17 in | 431.8 mm |
| 18 in | 457.2 mm |
| 19 in | 482.6 mm |
| 20 in | 508 mm |
| 25 in | 635 mm |
| 30 in | 762 mm |
| 40 in | 1,016 mm |
| 50 in | 1,270 mm |
| 60 in | 1,524 mm |
| 70 in | 1,778 mm |
| 75 in | 1,905 mm |
| 80 in | 2,032 mm |
| 90 in | 2,286 mm |
| 100 in | 2,540 mm |
| 150 in | 3,810 mm |
| 200 in | 5,080 mm |
| 250 in | 6,350 mm |
| 500 in | 12,700 mm |
| 1,000 in | 25,400 mm |
Common Inches to MM conversions
- 1 inch = 25.4 millimeters
Popular length converters
How to Use the Inches to MM Converter
- Type a value in the From box and choose its unit.
- Pick the unit you want in the To list — the result updates as you type.
- Use the swap button to reverse the conversion, or type in the To box to convert backwards.
- Check the All conversions table to see your value in every unit; click a row to make it the target.
Frequently Asked Questions
How many millimeters are in an inch?
There are 25.4 millimeters in 1 inch. Going the other way, 1 millimeter = 0.03937007874 inches.
How do I convert Inches to MM?
Use the formula millimeters = inches × 25.4. For example, 1 inch = 25.4 millimeters. Or type the value in the converter above and the answer appears as you type.
What is the Inches to MM formula?
millimeters = inches × 25.4 — the conversion factor is exact to the digits shown, using the international definitions of both units.
What is 2 inches in millimeters?
2 inches = 50.8 millimeters.
What is 5 inches in millimeters?
5 inches = 127 millimeters.
What is 10 inches in millimeters?
10 inches = 254 millimeters.
What is 25 inches in millimeters?
25 inches = 635 millimeters.
What is 100 inches in millimeters?
100 inches = 2,540 millimeters.
How do I convert MM back to Inches?
Use the swap button in the converter above, or open our MM to Inches converter. inches = millimeters × 0.03937007874.
Is this Inches to MM converter accurate?
Yes. It uses exact unit definitions and double-precision maths, and you can show up to 15 significant digits. The table below is calculated with the same formula.
Can I convert Inches to other length units?
Yes — pick any unit in the From and To lists above, or open the full Length Converter, which handles 92 length units.
Is the Inches to MM converter free?
Yes, it is free with no sign-up, and every conversion runs in your browser so nothing is sent to a server.