Convert Inches to Millimeters
1 inch = 25.4 millimeters. Type any value below to convert in either direction — the calculation happens in your browser.
Guide & FAQInches to Millimeters formula · Inches to Millimeters conversion table · Millimeters to Inches conversion table · About the inch · About the millimeter · Frequently asked questions
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.
Common inches to millimeters values
Worked answers for the values people look up most.