1 Inches in Millimeters (in to mm)
1 in = 25.4 mm
1 Inches equals 25.4 Millimeters (1 in = 25.4 mm).
Quick Facts: Inches to Millimeters
- Conversion
- 1 Inches = 25.4 Millimeters
- Formula
- Convert Inches to Millimeters
- Calculation
- 1 in → 25.4 mm
- Reverse
- 25.4 mm = 1 in
- Also equals
- 254,000,000 A · 2.54 cm · 0.001 ch · 0.254 dm · 0.014 ftm · 0.083 ft · 0.25 hh · 0.025 m
How Much Is 1 in?
1 in is roughly Screw thread or sheet metal
How to Convert Inches to Millimeters
mm = in × 25.4
- Start with 1 in
- Calculate 1 × 25.4
- The result is 25.4 mm
Worked example: 1 in = 25.4 mm
Common Inches to Millimeters Conversions
| Inches (in) | Millimeters (mm) | Status |
|---|---|---|
| 0.25 in | 6.35 mm | |
| 0.5 in | 12.7 mm | |
| 1 in | 25.4 mm | Current |
| 2 in | 50.8 mm | |
| 3 in | 76.2 mm | |
| 4 in | 101.6 mm | |
| 5 in | 127 mm | |
| 6 in | 152.4 mm | |
| 8 in | 203.2 mm | |
| 10 in | 254 mm | |
| 12 in | 304.8 mm | |
| 18 in | 457.2 mm | |
| 24 in | 609.6 mm | |
| 36 in | 914.4 mm | |
| 48 in | 1,219.2 mm | |
| 72 in | 1,828.8 mm | |
| 100 in | 2,540 mm |
Want to learn more? Read our complete Inches to Millimeters guide with formula, FAQ, and background info.