Convert Millimeters to Inches
One millimeter equals 0.0393701 inches. Type any value to convert millimeters to inches instantly — with a full reference table below.
Convert Millimeters to Inches
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How to convert Millimeters to Inches
To convert millimeters to inches, multiply by 0.0393701. One millimeter equals 0.0393701 in, and one inch equals 25.4 mm.
- Take the value in millimeters — for example 7.5 mm.
- Multiply by 0.0393701 (the number of inches in one millimeter).
- 7.5 × 0.0393701 = 0.295276 in.
Quick mental estimate: Divide the number of millimeters by 25.4 — that is exact.
Millimeters to Inches conversion table
| Millimeters | Inches |
|---|---|
| 1 mm | 0.0393701 in |
| 2 mm | 0.0787402 in |
| 3 mm | 0.11811 in |
| 4 mm | 0.15748 in |
| 5 mm | 0.19685 in |
| 6 mm | 0.23622 in |
| 7 mm | 0.275591 in |
| 8 mm | 0.314961 in |
| 9 mm | 0.354331 in |
| 10 mm | 0.393701 in |
| 12 mm | 0.472441 in |
| 15 mm | 0.590551 in |
| 20 mm | 0.787402 in |
| 25 mm | 0.984252 in |
| 50 mm | 1.968504 in |
| 100 mm | 3.937008 in |
| 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 |
| 12 in | 304.8 mm |
| 15 in | 381 mm |
| 20 in | 508 mm |
| 25 in | 635 mm |
| 50 in | 1,270 mm |
| 100 in | 2,540 mm |
About converting Millimeters to Inches
Millimeters (mm) and Inches (in) are both units of length. The exact factor is 1 mm = 0.0393701 in, so multiply by 0.0393701 to go from millimeters to inches (or divide to go back).
The conversion runs entirely in your browser. Need the reverse? Use the Inches to Millimeters converter, or the full unit converter for every unit at once.
Real-world length in millimeters and inches
| Example | Millimeters | Inches |
|---|---|---|
| A credit card's width (ISO/IEC 7810) | 85.6 mm | 3.370079 in |
| The long side of A4 paper (ISO 216) | 297 mm | 11.69291 in |
| A US standard door (80 in tall) | 2,032 mm | 80 in |
| A football pitch (FIFA recommended length) | 105,000 mm | 4,133.858 in |
“≈” marks typical values; the rest are defined or measured figures.
The units
One thousandth of a metre.
Used for: Engineering drawings, rainfall, screen and jewellery sizes.
Exactly 25.4 mm (1/12 of a foot).
Used for: US and UK screen sizes, tyres, timber and body measurements.
Every length factor here is exact: the inch has been defined as exactly 25.4 mm since the 1959 International Yard and Pound Agreement.