Quick Reference
Common MM to Inches Conversions
Find commonly used millimeter values and their inch equivalents, then open a dedicated conversion page for decimal, fractional and feet-and-inches results.
Maintained by mmtoinches.im · Updated
NIST describes the standard inch as exactly equivalent to 25.4 mm
. NIST length definition. Method and limitations.
A curated table of frequently used millimeter values converted to inches, with fractional and feet+inches display. Jump to detailed value pages or use the full chart for more.
Need more values?
Popular conversions
| mm | Inches (4 dp) | Nearest fraction | Feet + inches | Detail page |
|---|---|---|---|---|
| 1 | 0.0394 | 3/64" | 0 ft 0.04 in | View 1 mm page |
| 2 | 0.0787 | 5/64" | 0 ft 0.08 in | View 2 mm page |
| 5 | 0.1969 | 13/64" | 0 ft 0.20 in | View 5 mm page |
| 10 | 0.3937 | 25/64" | 0 ft 0.39 in | View 10 mm page |
| 12 | 0.4724 | 15/32" | 0 ft 0.47 in | View 12 mm page |
| 15 | 0.5906 | 19/32" | 0 ft 0.59 in | View 15 mm page |
| 20 | 0.7874 | 25/32" | 0 ft 0.79 in | View 20 mm page |
| 25.4 | 1.0000 | 1" | 0 ft 1.00 in | View 25.4 mm page |
| 30 | 1.1811 | 1 3/16" | 0 ft 1.18 in | View 30 mm page |
| 40 | 1.5748 | 1 37/64" | 0 ft 1.57 in | View 40 mm page |
| 50 | 1.9685 | 1 31/32" | 0 ft 1.97 in | View 50 mm page |
| 75 | 2.9528 | 2 61/64" | 0 ft 2.95 in | View 75 mm page |
| 100 | 3.9370 | 3 15/16" | 0 ft 3.94 in | View 100 mm page |
| 150 | 5.9055 | 5 29/32" | 0 ft 5.91 in | View 150 mm page |
| 200 | 7.8740 | 7 7/8" | 0 ft 7.87 in | View 200 mm page |
| 250 | 9.8425 | 9 27/32" | 0 ft 9.84 in | View 250 mm page |
| 300 | 11.8110 | 11 13/16" | 0 ft 11.81 in | View 300 mm page |
| 400 | 15.7480 | 15 3/4" | 1 ft 3.75 in | View 400 mm page |
| 500 | 19.6850 | 19 11/16" | 1 ft 7.69 in | View 500 mm page |
| 1000 | 39.3701 | 39 3/8" | 3 ft 3.37 in | View 1000 mm page |
Fractions are rounded to the nearest 1/64 inch and simplified; maximum rounding error is 0.1984375 mm. For higher precision or different denominators, use the fraction converter.
Sources and calculation notes
Find commonly used millimeter values and their inch equivalents, then open a dedicated conversion page for decimal, fractional and feet-and-inches results.
Method: Divide millimeters by 25.4 to obtain inches. The factor is exact; displayed decimal values are rounded. Fractional inches are rounded to the selected denominator.
Scope: A unit conversion does not establish a manufacturing tolerance or guarantee that similarly sized parts fit. Keep the original measurement and its uncertainty.
Content maintained by mmtoinches.im. Updated and reference notes reviewed . How we calculate and present measurements. Sources support the stated definitions; examples and calculators are not certification of a product or compliance with a standard.