How this calculator works
The SI prefix micro means 10^-6. One micrometre is therefore 0.000001 m, 0.001 mm or 1000 nm exactly. A micron is the older name for the same length. Enter either side or select another unit to compare a microscope measurement with a drawing dimension.
Formula
nm = um x 1000; um = nm / 1000; mm = um / 1000; inches = um / 25400.
Worked example
A 12.5 um layer is 12500 nm, 0.0125 mm and about 0.000492126 inches. A 250 nm feature is 0.25 um.
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Frequently asked questions
Is a micron the same as a micrometre?
Yes. Both names refer to 10^-6 metres.
Is this a micrometer instrument calculator?
It converts lengths. It does not interpret the thimble or sleeve markings on a mechanical micrometer.
How many micrometres make a mil?
Exactly 25.4 um make one thousandth of an international inch.