About This Calculator
This tool converts length between millimeters (mm) and inches (in) using the exact ratio 1 in = 25.4 mm. It is helpful in engineering, machining, carpentry, and global measurement applications.
How It Works
- Select the direction: Millimeters to Inches or Inches to Millimeters.
- Enter the value to convert.
- The calculator uses the standard formulas:
Inches = Millimeters ÷ 25.4
Millimeters = Inches × 25.4
Note: The conversion is exact and consistent with all major standards.
Millimeters and Inches Conversion Table
| Millimeters (mm) | Inches (in) |
|---|---|
| 10 mm | 0.3937 in |
| 25 mm | 0.9843 in |
| 50 mm | 1.9685 in |
| 100 mm | 3.9370 in |
| 150 mm | 5.9055 in |
| 200 mm | 7.8740 in |
Frequently Asked Questions
What is the conversion factor?
1 inch = 25.4 millimeters exactly, defined by international agreement.
Can I convert inches to millimeters?
Yes. This tool supports both directions using a toggle switch.
Is it suitable for technical and precision tasks?
Yes, the tool uses exact factors suitable for science, engineering, and machining.