Convert mm to inches instantly with decimal and fraction results. Perfect for hardware, engineering, DIY projects, and international measurements.
Formula: Inches = MM ÷ 25.4
| Millimeters (mm) | Inches (decimal) | Inches (fraction) |
|---|---|---|
| 1 mm | 0.0394" | 3/64" |
| 2 mm | 0.0787" | 5/64" |
| 3 mm | 0.1181" | 1/8" |
| 4 mm | 0.1575" | 5/32" |
| 5 mm | 0.1969" | 13/64" |
| 6 mm | 0.2362" | 15/64" |
| 8 mm | 0.3150" | 5/16" |
| 10 mm | 0.3937" | 25/64" |
| 12 mm | 0.4724" | 15/32" |
| 15 mm | 0.5906" | 19/32" |
| 20 mm | 0.7874" | 25/32" |
| 25 mm | 0.9843" | 63/64" |
| 30 mm | 1.1811" | 1 3/16" |
| 40 mm | 1.5748" | 1 37/64" |
| 50 mm | 1.9685" | 1 31/32" |
| 100 mm | 3.9370" | 3 15/16" |
| 150 mm | 5.9055" | 5 29/32" |
| 200 mm | 7.8740" | 7 7/8" |
| 250 mm | 9.8425" | 9 27/32" |
| 300 mm | 11.8110" | 11 13/16" |
Converting millimeters to inches is straightforward using the exact conversion factor. Since 1 inch = 25.4 millimeters (this is an exact definition, not an approximation), you can convert by dividing the millimeter value by 25.4.
Inches = Millimeters ÷ 25.4In the US, measurements are often expressed in fractions rather than decimals. Common fractional increments include 1/16", 1/8", 1/4", 1/2", and their combinations. This calculator provides fractional equivalents rounded to the nearest 1/64" for practical applications.
To convert millimeters to inches, divide the millimeter value by 25.4 (since 1 inch = 25.4 mm exactly). For example, 50 mm ÷ 25.4 = 1.9685 inches.
The formula is: Inches = Millimeters ÷ 25.4. This is an exact conversion factor defined by international standards.
10 millimeters equals approximately 0.3937 inches, or roughly 25/64 of an inch.
Converting millimeters to inches is essential when working with tools, hardware, or materials from different countries. The US primarily uses inches while most other countries use the metric system.
Yes! The conversion factor (1 inch = 25.4 mm) is defined exactly by international agreement. This calculator provides results accurate to 4 decimal places.