Convert Inches to Millimeters
1 inch = 25.4 millimeters. Type any value below to convert in either direction — the calculation happens in your browser.
Inches to Millimeters formula
Multiply the number of inches by 25.4 to get millimeters.
millimeters = inches × 25.4To go the other way: divide the number of millimeters by 25.4, or multiply by 0.03937008.
inches = millimeters ÷ 25.4Inches to Millimeters conversion table
| Inches | Millimeters |
|---|---|
| 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 |
| 15 in | 381 mm |
| 20 in | 508 mm |
| 25 in | 635 mm |
| 30 in | 762 mm |
| 40 in | 1,016 mm |
| 50 in | 1,270 mm |
| 75 in | 1,905 mm |
| 100 in | 2,540 mm |
| 250 in | 6,350 mm |
| 500 in | 12,700 mm |
| 1,000 in | 25,400 mm |
Millimeters to Inches conversion table
| Millimeters | Inches |
|---|---|
| 1 mm | 0.03937008 in |
| 2 mm | 0.07874016 in |
| 3 mm | 0.1181102 in |
| 4 mm | 0.1574803 in |
| 5 mm | 0.1968504 in |
| 6 mm | 0.2362205 in |
| 7 mm | 0.2755906 in |
| 8 mm | 0.3149606 in |
| 9 mm | 0.3543307 in |
| 10 mm | 0.3937008 in |
About the inch
An inch is exactly 25.4 millimetres and is used for screen sizes, pipe diameters and paper dimensions.
About the millimeter
A millimetre is one thousandth of a metre and is the default unit on engineering drawings and rulers.
Frequently asked questions
How many millimeters are in a inch?
There are 25.4 millimeters in one inch.
How many inches are in a millimeter?
There are 0.03937008 inches in one millimeter.
Is this conversion exact?
The ratio between the inch and the millimeter is fixed by definition, so the conversion is exact — the figures shown here are rounded for readability only.
What is 10 inches in millimeters?
10 inches equals 254 millimeters.