Convert millimeters to inches
in = mm × 0.0393701. 12 mm = 0.472441 in.
in = mm × 0.0393701 — 1 mm is 0.0393701 in
Common values, converted exactly
| millimeters (mm) | inches (in) |
|---|---|
| 1 mm | 0.0393701 in (≈ 1/16) |
| 2 mm | 0.0787402 in (≈ 1/16) |
| 3 mm | 0.11811 in (≈ 1/8) |
| 5 mm | 0.19685 in (≈ 3/16) |
| 6 mm | 0.23622 in (≈ 1/4) |
| 10 mm | 0.393701 in (≈ 3/8) |
| 12 mm | 0.472441 in (≈ 1/2) |
| 15 mm | 0.590551 in (≈ 9/16) |
| 20 mm | 0.787402 in (≈ 13/16) |
| 25 mm | 0.984252 in (≈ 1) |
| 50 mm | 1.9685 in (≈ 1 15/16) |
| 100 mm | 3.93701 in (≈ 3 15/16) |
To convert millimeters to inches, apply in = mm × 0.0393701. For example, 12 mm = 0.472441 in, and 1 mm is 0.0393701 in.
One inch is exactly 25.4 mm. Fractional inches are the usual answer in workshop use, so the table below gives the nearest 1/16 alongside each decimal, marking with ≈ any value that falls between the marks rather than on one.
Everything on this page is computed in your browser from the exact definitions above — the table is not a stored list of pre-rounded answers, and neither is the converter. For a unit not covered here, the full unit converter handles length, weight, volume, temperature and cooking measures.
How many inches is 12 mm?
12 mm = 0.472441 in. in = mm × 0.0393701, so any amount converts the same way — the table on this page lists the values most often looked up.
What is the formula for converting millimeters to inches?
in = mm × 0.0393701. One inch is exactly 25.4 mm. Fractional inches are the usual answer in workshop use, so the table below gives the nearest 1/16 alongside each decimal, marking with ≈ any value that falls between the marks rather than on one.
Is the millimeters to inches conversion exact?
The underlying relationship is an exact definition, not a measurement. The decimal factor shown (0.0393701 in) is a rounding of it, so results here are given to six significant figures — enough for any practical use, and you can see the exact definition above.
How do I convert inches back to millimeters?
Use the reverse of the same relationship; the inches to mm page has its own table and converter.