Inches to MM Converter
The Inches to MM Converter helps you quickly convert measurements from inches to millimeters. It is useful for engineering, construction, manufacturing, DIY projects, tools, hardware, printing and everyday measurements.
One inch is exactly equal to 25.4 millimeters. Enter your value above and the converter will calculate the result instantly. You can also use the swap button to convert millimeters back to inches.
Inches to MM Conversion Formula
The standard conversion formula is simple:
Millimeters = Inches × 25.4
For example, if you want to convert 5 inches to millimeters, multiply 5 by 25.4. The result is 127 millimeters.
Common Inches to MM Conversions
| Inches | Millimeters |
|---|---|
| 0.25 inch | 6.35 mm |
| 0.5 inch | 12.7 mm |
| 1 inch | 25.4 mm |
| 2 inches | 50.8 mm |
| 5 inches | 127 mm |
| 10 inches | 254 mm |
| 12 inches | 304.8 mm |
| 25 inches | 635 mm |
How to Convert Inches to MM
- Enter the inch value in the input box.
- The converter automatically calculates the millimeter value.
- Check the result displayed below the input fields.
- Use the swap button when you need to convert millimeters into inches.
- Use Reset to clear the current calculation.
MM to Inches Conversion
You can also convert millimeters to inches using the same calculator. The conversion formula is:
Inches = Millimeters ÷ 25.4
For example, 100 mm is approximately 3.937 inches.
Where Inches and Millimeters Are Used
Inches are commonly used in the United States and in many product specifications. Millimeters are widely used in engineering, manufacturing and technical measurements. You may often need to convert between the two units when working with screws, bolts, pipes, sheet metal, machine parts, tools and product dimensions.
Frequently Asked Questions
1 inch is exactly equal to 25.4 millimeters.
5 inches are equal to 127 millimeters.
10 inches are equal to 254 millimeters.
25 inches are equal to 635 millimeters.
Yes. Use the swap button and enter the millimeter value. The calculator will convert it into inches.
Yes. The converter supports decimal values such as 0.5, 1.25, 2.75 and 10.5 inches.