20 mm to µm — 20 millimetres in micrometres
Exact 20 × 1,000 = 20,000
20 millimetres in other units
| Nanometres | 20,000,000 | nm |
|---|---|---|
| Micrometres | 20,000 | µm |
| Centimetres | 2 | cm |
| Metres | 0.02 | m |
| Kilometres | 0.00002 | km |
| Inches | 0.78740157 | in |
| Feet | 0.0656168 | ft |
| Yards | 0.02187227 | yd |
| Miles | 0.000012427424 | mi |
| Nautical miles | 0.000010799136 | nmi |
mm to µm at a glance
| Millimetres | Micrometres |
|---|---|
| 1 mm | 1,000 µm |
| 2 mm | 2,000 µm |
| 3 mm | 3,000 µm |
| 5 mm | 5,000 µm |
| 10 mm | 10,000 µm |
| 20 mm | 20,000 µm |
| 25 mm | 25,000 µm |
| 50 mm | 50,000 µm |
| 100 mm | 100,000 µm |
| 250 mm | 250,000 µm |
| 500 mm | 500,000 µm |
| 1,000 mm | 1,000,000 µm |
How to convert millimetres to micrometres
Multiply by 1,000 — one millimetre is 1,000 micrometres. That factor is exact: it comes from the definition of the units rather than from a measurement, so it will not change and does not need rounding.
Working 20 × 1,000 = 20,000
In words: twenty thousand micrometres.
What these units are
The millimetre and the micrometre are covered in the length unit guide, along with every other unit on this page.
Questions
How many micrometres are in a millimetre?
One millimetre is 1,000 micrometres. This figure is exact — it comes from the definition of the unit, not a measurement.
What is 20 millimetres in micrometres?
20 millimetres is 20,000 micrometres. The working is 20 × 1,000 = 20,000.
Is an inch exactly 2.54 centimetres?
Yes, exactly. Since 1959 the international inch has been defined as 25.4 millimetres, so the figure is a definition rather than a measurement. Every foot, yard and mile figure on this page follows from it and is equally exact.
Why is a nautical mile different from a mile?
It is tied to the Earth rather than to a body part. One nautical mile is one minute of latitude, fixed at exactly 1,852 metres, which makes chart work straightforward for anyone navigating by degrees.
How do I write my height in metric?
Convert the whole thing to inches first, then multiply by 2.54. Five foot ten is 70 inches, which is 177.8 cm. Converting the feet and the inches separately is where the arithmetic usually goes wrong.
Meter or metre?
Both name the same unit. "Metre" is the international spelling used by the SI and most English-speaking countries; "meter" is standard in the United States. Either spelling will find this page.