mm to um Converter - Millimeter to Micrometer

Millimeter (mm) to Micrometer (μm) (um)

Direct answer

1 mm = 1,000 um

um = mm × 1,000

Converter

Input

Result

1,000um

um = mm × 1,000

mm = um × 0.001

Example: 10 mm = 10 × 1,000 = 10,000 um.

Express both mm and um in the same base unit m (meter), then cancel the shared base unit.

1
Rewrite mm in the base unit
$1 mm = 0.001 m$
2
Rewrite um in the base unit
$1 um = 0.000001 m$
3
Forward conversion
$1 mm = \frac{0.001 m}{0.000001 m} \times 1 um = \frac{0.001}{0.000001} um = 1, 000 um$
4
Reverse conversion
$1 um = \frac{0.000001 m}{0.001 m} \times 1 mm = \frac{0.000001}{0.001} mm = 0.001 mm$

A guarded explanation for this pair page covering definition, principle, assumptions, and cautions.

Guarded output

AI text is for interpretation only. The page calculator remains the source of truth for numeric results.

1 mm = 1,000 um.

10 mm = 10,000 um.

100 mm = 100,000 um.

Use um = mm × 1,000.

1 um = 0.001 mm.

Use the conversion factor and round the result to the precision required by your calculation.