MM to Inches Converter
Convert millimeters to inches using the exact international relationship 1 inch = 25.4 millimeters. Divide the millimeter measurement by 25.4 to calculate inches.
Quick conversion table
| Millimeters | Inches |
|---|---|
| 1 mm | 0.0394 in |
| 2 mm | 0.0787 in |
| 5 mm | 0.1969 in |
| 10 mm | 0.3937 in |
| 20 mm | 0.7874 in |
| 25 mm | 0.9843 in |
| 25.4 mm | 1 in |
| 50 mm | 1.9685 in |
| 100 mm | 3.937 in |
| 250 mm | 9.8425 in |
| 500 mm | 19.685 in |
| 1000 mm | 39.3701 in |
How to use the MM to Inches Converter
- Enter the measurement in millimeters.
- The converter divides the millimeter value by exactly 25.4.
- Choose the number of decimal places you want to display.
- Use the quick-value buttons for common millimeter measurements.
- Review the conversion table for frequently used mm to inch values.
- Copy the result or use Swap to convert inches back to millimeters.
Examples
1 mm to inches
1 mm ÷ 25.4 = approximately 0.03937 inches.
10 mm to inches
10 mm ÷ 25.4 = approximately 0.3937 inches.
25.4 mm to inches
25.4 millimeters equals exactly 1 inch.
50 mm to inches
50 mm ÷ 25.4 = approximately 1.9685 inches.
100 mm to inches
100 mm ÷ 25.4 = approximately 3.937 inches.
Frequently asked questions
How many inches are in 1 millimeter?
One millimeter equals approximately 0.0393701 inches.
What is the formula for mm to inches?
Divide the number of millimeters by 25.4.
Is 25.4 mm exactly 1 inch?
Yes. The international inch is defined as exactly 25.4 millimeters.
How many inches is 10 mm?
10 millimeters is approximately 0.3937 inches.
How many inches is 20 mm?
20 millimeters is approximately 0.7874 inches.
How many inches is 50 mm?
50 millimeters is approximately 1.9685 inches.
How many inches is 100 mm?
100 millimeters is approximately 3.937 inches.
Are millimeter and millimetre the same unit?
Yes. Millimeter is the common US spelling and millimetre is the international British spelling. Both mean one thousandth of a meter.
Can I convert inches back to millimeters?
Yes. Use the Swap button or open the dedicated Inches to MM Converter.
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