Inches to Millimeters (in to mm) Converter
Free length conversion tool
Result
0
mm
📝 How to Use
1️⃣
Enter length in inches or mm
2️⃣
See instant conversion
3️⃣
Copy result with one click
🔢 Conversion Formula
Millimeters
=
Inches
×
25.4
Inches
=
Millimeters
/
25.4
📊 Quick Reference Table
| Inches | Millimeters |
|---|---|
| 1/8 in | 3.175 mm |
| 1/4 in | 6.35 mm |
| 1/2 in | 12.7 mm |
| 3/4 in | 19.05 mm |
| 1 in | 25.4 mm |
| 2 in | 50.8 mm |
| 3 in | 76.2 mm |
| 4 in | 101.6 mm |
❓ Frequently Asked Questions
How many mm is 1 inch?
1 inch is exactly 25.4 millimeters. This is the international standard conversion factor.
How to convert inches to mm?
To convert inches to millimeters, multiply the inch value by 25.4. For example: 2 inches × 25.4 = 50.8 mm.
How many inches is 100 mm?
100 mm is approximately 3.937 inches. This is a common engineering measurement.