Micrometers to Nanometers
Convert micrometers to nanometers instantly — one micrometer is 1000 nanometers.
| Micrometers | Nanometers |
|---|---|
| 1 µm | 1000 nm |
| 2 µm | 2000 nm |
| 3 µm | 3000 nm |
| 5 µm | 5000 nm |
| 10 µm | 10000 nm |
| 25 µm | 25000 nm |
| 50 µm | 50000 nm |
| 100 µm | 100000 nm |
How to use
- Enter a value in the Micrometers field.
- The Nanometers figure appears immediately — no button to press.
- Typing in the Nanometers field converts back to Micrometers the same way.
- Use the reference table for the values that come up most often.
Micrometers to Nanometers formula
To convert micrometers to nanometers, multiply by 1000.
nm = µm × 1000
Put another way, one micrometer is exactly 1,000 nanometers.
Why this factor: the micrometer and the nanometer are both defined against the meter, so dividing one definition by the other gives 1000 directly. Both definitions are set out in full below.
To go the other way, divide by 1000 — or use the Nanometers to Micrometers converter, which is the same calculation reversed.
Worked example
Given 12 µm, multiplying by 1000 yields 12000 nm.
12 µm × 1000 = 12000 nm
The converter above does this for any value you type, in either direction.
What is a micrometer?
A micrometer, or micron, is one millionth of a meter — the scale of cells, fibers and semiconductor features.
Definition: Exactly 1×10⁻⁶ meter by SI prefix definition. Symbol µm.
Where it is used: Filtration ratings, particulate sizes (PM2.5 is 2.5 µm), fiber diameters, optical wavelengths.
Worth knowing: Often written 'micron' in industry. A human hair is roughly 70 µm across.
What is a nanometer?
A nanometer is one billionth of a meter — the scale of molecules and visible light wavelengths.
Definition: Exactly 1×10⁻⁹ meter by SI prefix definition.
Where it is used: Semiconductor process nodes, optical coatings, and wavelengths (visible light is roughly 380–750 nm).
Micrometers vs Nanometers
The micrometer and the nanometer belong to the same family of units, so converting between them is usually a matter of shifting a decimal point or applying a small whole-number factor.
Frequently asked questions
How many nanometers are in a micrometer?
One micrometer equals 1000 nanometers.
What is the formula to convert micrometers to nanometers?
Multiply the number of micrometers by 1000. To reverse it, divide by 1000 instead.
How do I convert nanometers back to micrometers?
Divide by 1000, which is the same as multiplying by 0.001.
How many nanometers are in 10 micrometers?
10 µm works out to 10000 nm.
Is there anything to watch out for with micrometers?
Often written 'micron' in industry. A human hair is roughly 70 µm across.
How is the micrometer defined?
Exactly 1×10⁻⁶ meter by SI prefix definition. Symbol µm.