Inches to Millimeters Converter
Convert inches to millimeters instantly with precise calculations. Perfect for engineering, manufacturing, and precision measurements.
📊 Quick Reference
1/4 in
6.35 mm
1/2 in
12.7 mm
1 in
25.4 mm
2 in
50.8 mm
12 in
304.8 mm
💡 How to Use This Tool
Convert inches to millimeters instantly with our easy-to-use converter. Follow these simple steps:
Enter Inches
Type the inch value you want to convert in the input field.
View Result
The equivalent value in millimeters appears instantly as you type.
Copy Result
Click "Copy Result" to copy the converted value to your clipboard.
Reference Table
Use the quick reference section for common conversions.
📖 About Inches to Millimeters Converter
What is Inches to Millimeters Conversion?
Converting inches to millimeters is essential when working with precision measurements. Inches are commonly used in the United States, while millimeters are the standard metric unit for small measurements worldwide.
The Conversion Formula
One inch equals exactly 25.4 millimeters. Therefore:
Millimeters = Inches × 25.4
For example, 2 inches × 25.4 = 50.8 millimeters.
Common Use Cases
- Engineering & Manufacturing: Converting blueprint measurements for precision machining
- 3D Printing: Converting dimensions for accurate prints
- Woodworking: Measuring lumber and hardware in different unit systems
- Electronics: Component specifications often use both units
- Jewelry Making: Precise sizing for rings, chains, and settings
Quick Reference Table
| Inches | Millimeters |
|---|---|
| 1/8 in | 3.175 mm |
| 1/4 in | 6.35 mm |
| 1/2 in | 12.7 mm |
| 1 in | 25.4 mm |
| 2 in | 50.8 mm |
Privacy & Security
This converter runs entirely in your browser. Your data never leaves your device. All calculations happen locally for complete privacy.
❓ Frequently Asked Questions
Version History
Initial release
Jan 24, 2026