How Many MM Are in an Inch?
The short answer, a converter for any number, and a chart of common amounts.
Quick answer: There are 25.4 millimeters in 1 inch. So 1 millimeter is 0.03937 inches.
How to use it
The answer
There are 25.4 millimeters in 1 inch. So 1 millimeter is 0.03937 inches.
To convert inches to millimeters, multiply by 25.4. To go from millimeters to inches, multiply by 0.03937.
Inches to millimeters chart
| Inches | Millimeters |
|---|---|
| 1 inch | 25.4 millimeters |
| 2 inches | 50.8 millimeters |
| 3 inches | 76.2 millimeters |
| 4 inches | 101.6 millimeters |
| 5 inches | 127 millimeters |
| 10 inches | 254 millimeters |
| 20 inches | 508 millimeters |
| 50 inches | 1,270 millimeters |
| 100 inches | 2,540 millimeters |
Millimeters to inches chart
| Millimeters | Inches |
|---|---|
| 1 millimeter | 0.03937 inches |
| 2 millimeters | 0.07874 inches |
| 5 millimeters | 0.19685 inches |
| 10 millimeters | 0.3937 inches |
| 25 millimeters | 0.98425 inches |
| 50 millimeters | 1.9685 inches |
| 100 millimeters | 3.937 inches |
What people use it for
- Cooking, baking and shopping
- Homework and science
- Travel and road signs
- Reading labels and instructions
- Quick checks without a calculator
Questions
How many millimeters are in an inch?
There are 25.4 millimeters in 1 inch. So 1 millimeter is 0.03937 inches.
How many inches are in a millimeter?
There are 0.03937 inches in 1 millimeter.
Is the number exact?
It uses the exact definitions of the units and is rounded for display.
Is it free?
Yes. No sign-up, no install and no limit.
Is anything saved or sent?
No. Everything runs in your browser. Only your own best score, where a page shows one, is kept on your device.
Last updated 2026-10-24. Free to use, no sign-up. Made by ficklestudio26.