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Displacement Unit Converter: mm, in, mil, µm
Type a value in any box and the others update. For a displacement limit or a dial-gauge reading in mm when the spec, the gauge or the report uses inches (or the other way round).
Length / displacement
1 in = 25.4 mm exactly; 1 mil = 0.001 in. Nothing you type is uploaded or saved.
mm to inches table
| mm | in | mil |
|---|
| 0.01 mm | 0.0004 in | 0.4 mil |
| 0.02 mm | 0.0008 in | 0.8 mil |
| 0.05 mm | 0.0020 in | 2.0 mil |
| 0.1 mm | 0.0039 in | 3.9 mil |
| 0.2 mm | 0.0079 in | 7.9 mil |
| 0.25 mm | 0.0098 in | 9.8 mil |
| 0.3 mm | 0.0118 in | 11.8 mil |
| 0.5 mm | 0.0197 in | 19.7 mil |
| 1 mm | 0.0394 in | 39.4 mil |
| 1.5 mm | 0.0591 in | 59.1 mil |
| 2 mm | 0.0787 in | 78.7 mil |
| 2.5 mm | 0.0984 in | 98.4 mil |
| 3 mm | 0.1181 in | 118.1 mil |
| 5 mm | 0.1969 in | 196.9 mil |
| 10 mm | 0.3937 in | 393.7 mil |
Inches to mm table
| in | mil | mm |
|---|
| 0.0005 in | 0.5 mil | 0.013 mm |
| 0.001 in | 1.0 mil | 0.025 mm |
| 0.002 in | 2.0 mil | 0.051 mm |
| 0.005 in | 5.0 mil | 0.127 mm |
| 0.01 in | 10.0 mil | 0.254 mm |
| 0.015 in | 15.0 mil | 0.381 mm |
| 0.02 in | 20.0 mil | 0.508 mm |
| 0.03 in | 30.0 mil | 0.762 mm |
| 0.04 in | 40.0 mil | 1.016 mm |
| 0.05 in | 50.0 mil | 1.270 mm |
| 0.0625 in (1/16) | 62.5 mil | 1.588 mm |
| 0.1 in | 100.0 mil | 2.540 mm |
| 0.125 in (1/8) | 125.0 mil | 3.175 mm |
| 0.25 in (1/4) | 250.0 mil | 6.350 mm |
The conversion factors
The inch is defined as exactly 25.4 mm, so every factor here is exact and the only rounding is in the display: 1 mm = 0.03937008 in = 39.37008 mil, 1 mil (thou) = 0.001 in = 0.0254 mm = 25.4 µm, 1 µm = 0.001 mm, 1 cm = 10 mm. The mm table is rounded to 0.0001 in and 0.1 mil, the inch table to 0.001 mm; the converter shows up to six decimals.
This page converts units only; the displacement limit comes from your spec or the anchor manufacturer. To check readings taken during a hold against a limit, use the displacement under load check; to time the hold, the proof-load hold timer; for loads, the force unit converter.
Record the results in the full report workbook
The Fastener & Anchor Pull-Test Report Templates pack has a 40-row proof-test report with automatic PASS/FAIL, ultimate-load statistics, a calibration log, a unit converter, a printable procedure checklist and a standards index. $49 one-time, from Quality Tester Solutions LLC, the company behind Force-Test pull testers.