Inches to Millimeters Converter
Convert inches to millimeters instantly with this free inches to millimeters converter. Enter any value to get an accurate length conversion, plus the formula, the conversion factor and a full reference table.
What is 1 inch in millimeters?
1 inch is equal to exactly 25.4 millimeters.
1 × 25.4 = 25.4 millimeters
Result
1 inch = 25.4 millimeters
Inches to Millimeters formula
mm = in × 25.4
The inches to millimeters conversion factor is 25.4, which is exact by definition. 1 inch = 25.4 millimeters, and 1 millimeter = 0.03937007874 inches.
Worked examples
- 2 inches = 50.8 millimeters — 2 × 25.4 = 50.8 millimeters
- 6 inches = 152.4 millimeters — 6 × 25.4 = 152.4 millimeters
- 10 inches = 254 millimeters — 10 × 25.4 = 254 millimeters
Inches to Millimeters conversion table
Every value below is calculated with the exact conversion factor and rounded for display.
| Inches (in) | Millimeters (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 |
| 12 in | 304.8 mm |
| 15 in | 381 mm |
| 20 in | 508 mm |
| 25 in | 635 mm |
| 30 in | 762 mm |
| 50 in | 1,270 mm |
| 75 in | 1,905 mm |
| 100 in | 2,540 mm |
| 500 in | 12,700 mm |
| 1,000 in | 25,400 mm |
Common inches values
Related conversions
Frequently asked questions
- What is 1 inch in millimeters?
- 1 inch is equal to 25.4 millimeters.
- How many inches are in one millimeter?
- There are 0.039370079 inches in 1 millimeter.
- How do you convert inches to millimeters?
- Multiply the number of inches by 25.4 — or use the formula mm = in × 25.4.
- What is 6 inches in millimeters?
- 6 inches is 152.4 millimeters. 6 × 25.4 = 152.4 millimeters.
- Is the inches to millimeters conversion exact?
- Yes. The relationship is fixed by definition, so 25.4 is an exact conversion factor — only the displayed result is rounded.