Millimeter to Micrometer Converter
Length · unit-converter
Convert Millimeter to Micrometer with a fixed input and output unit, step-by-step formula line, and reference tables. All calculations use SI-based definitions (international yard, nautical mile, etc.).
Calculator
From: Millimeter (mm)
To: Micrometer (um)
About Millimeter
The millimeter is a metric unit equal to one thousandth of a meter (0.001 m). It is used for precision engineering, 3D printing, and small tolerances.
About Micrometer
The micrometer (micron) is one millionth of a meter. It is used in microscopy, manufacturing tolerances, and fiber optics.
How to convert millimeters to micrometers
1 millimeter is equal to 1000.00000000000011 micrometer:
1 mm = (0.001 m ÷ 0.000001 m) um = 1000.00000000000011 um
Each millimeter is defined as 0.001 m and each micrometer as 0.000001 m, so one mm equals 0.001 ÷ 0.000001 um = 1000.00000000000011 um.
Let d(mm) be the numeric value of the same length measured in Millimeter (mm), and d(um) the value in Micrometer (um). Then:
d(um) = d(mm) × (0.001 / 0.000001)
Equivalently, divide by how many mm fit into one um (meters per um divided by meters per mm):
d(um) = d(mm) ÷ 0.001
Or: micrometer = millimeter ÷ 0.001
Examples
Example #1: Convert 20 mm to micrometer
20 mm = 20 mm × (0.001/0.000001) um = 20000 um
20 mm = 20 mm ÷ 0.001 = 20000 um
Example #2: Convert 50 mm to micrometer
50 mm = 50 mm × (0.001/0.000001) um = 50000 um
50 mm = 50 mm ÷ 0.001 = 50000 um
Summary
To convert Millimeter to Micrometer, multiply the value in mm by the ratio of meters per mm divided by meters per um. Equivalently: value_um = value_mm × (0.001 / 0.000001). Numerically, 1 mm equals 1000.0000000000001 um.
Relationship context
Both units are metric (SI) and tied to the meter. Converting between them uses powers of ten (or simple rational factors), so the relationship is exact in decimal arithmetic. The factor from Millimeter to Micrometer is 1.000000e+3 (1 mm = 1000.0000000000001 um).
Conversion tables
| Millimeter (mm) | Micrometer (um) |
|---|---|
| 0.1 | 100 |
| 1 | 1,000 |
| 2 | 2,000 |
| 3 | 3,000 |
| 4 | 4,000 |
| 5 | 5,000 |
| 6 | 6,000 |
| 7 | 7,000 |
| 8 | 8,000 |
| 9 | 9,000 |
| Millimeter (mm) | Micrometer (um) |
|---|---|
| 10 | 10,000 |
| 20 | 20,000 |
| 30 | 30,000 |
| 40 | 40,000 |
| 50 | 50,000 |
| 60 | 60,000 |
| 70 | 70,000 |
| 80 | 80,000 |
| 90 | 90,000 |
| 100 | 100,000 |