Millimeters to Inches Converter
Convert millimeters to decimal inches and fractional fractions accurately.
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How to Convert Millimeters to Inches
To convert millimeters to inches, divide the value in millimeters by 25.4 because exactly 1 inch equals 25.4 millimeters.
Formula: Inches = Millimeters ÷ 25.4. For example, to convert 50 mm to inches: 50 ÷ 25.4 = 1.9685 inches.
Use our interactive screen ruler on the homepage to measure physical objects directly in millimeters or inches without manual math.
Quick Conversion Reference Table
| Millimeters (mm) | Decimal Inches (in) | Fractional Inch Equivalent |
|---|---|---|
| 1 mm | 0.0394 in | ~1/32 inch |
| 5 mm | 0.1969 in | ~3/16 inch |
| 10 mm (1 cm) | 0.3937 in | ~13/32 inch |
| 25.4 mm | 1.0000 in | 1 inch exact |
| 50 mm | 1.9685 in | ~1 31/32 inch |
| 85.6 mm (Credit Card) | 3.3701 in | ~3 3/8 inch |
| 100 mm | 3.9370 in | ~3 15/16 inch |