Nanometers to Micrometers Converter
Enter a length in nanometers and the converter returns micrometers immediately, rounded to four decimals. A micrometer is 1,000 nanometers, and the guide shows the rule with wavelength examples.
Related converters
Created by the Reeliy Editorial Team. Last updated: Oct 19, 2026
How many nanometers are in a micrometer?
A micrometer (μm, also called a micron) contains exactly 1,000 nanometers (nm). The micrometer is 10-6 m and the nanometer is 10-9 m, so they sit three powers of ten apart in the metric system.
1 μm = 1,000 nm 1 nm = 0.001 μmExact: both units are defined from the meter with SI prefixes.
Nanometers and micrometers in practice
Both units live in the world of the very small, but each has a preferred territory. Nanometers are used for wavelengths of ultraviolet and visible light, for the size of viruses and large molecules, and for the thickness of optical coatings. Micrometers describe cells, dust, pollen, filter pores and the infrared wavelengths used in telecommunications.
A single document often switches between them. A laser may be specified at 1550 nm while the fiber core diameter is given in micrometers, or a spectrometer may report in nanometers while a microscope manual talks in microns. The conversion keeps both on one scale.
How to convert nm to μm
micrometers = nanometers ÷ 1,000
- Enter the value in nanometers in the first box.
- The micrometer value is shown in the second box and refreshes as you type.
- By hand, divide by 1,000: move the decimal point three places to the left.
Worked examples
Green light. A wavelength of 550 nm is 550 ÷ 1,000 = 0.55 μm.
Fiber optics. Long-distance fiber commonly carries light near 1550 nm, which is 1550 ÷ 1,000 = 1.55 μm.
Ultraviolet. A 193 nm deep-ultraviolet source corresponds to 0.193 μm.
Back again. A 2.5 μm particle is 2.5 × 1,000 = 2,500 nm; the micrometers to nanometers converter covers that direction.
Nanometers to micrometers conversion table
| Nanometers (nm) | Micrometers (μm) |
|---|---|
| 1 | 0.001 |
| 10 | 0.01 |
| 50 | 0.05 |
| 100 | 0.1 |
| 250 | 0.25 |
| 400 | 0.4 |
| 500 | 0.5 |
| 550 | 0.55 |
| 700 | 0.7 |
| 1,000 | 1 |
| 2,500 | 2.5 |
| 10,000 | 10 |
Precision and related converters
The answer is limited to four decimal places, so the smallest step the converter can show is 0.0001 μm, which equals 0.1 nm. An input of 0.4 nm gives 0.0004 μm, and anything much smaller rounds to 0. If you need to keep more digits, divide by 1,000 yourself and keep the full result.
To move to a bigger unit, see nanometers to millimeters. The opposite direction for this pair is the micrometers to nanometers converter, and more length tools are collected under dimension converters.
Frequently asked questions
How many nm are in a μm?
There are exactly 1,000 nanometers in one micrometer.
How do I convert nanometers to micrometers?
Divide by 1,000. For example, 750 nm ÷ 1,000 = 0.75 μm.
Is a micrometer the same as a micron?
Yes. Micron is the traditional name for the micrometer, which is 10-6 of a meter. Both appear in science and industry.
What is 1550 nm in micrometers?
1550 nm is 1.55 μm. That is a standard infrared wavelength for optical-fiber communication.
References
Cite this converter and page
If you use this page in your work, you can cite it as:
Reeliy Editorial Team. (2026). Nanometers to Micrometers Converter. Reeliy. https://reeliy.com/converters/convert-nm-to-micrometer“Nanometers to Micrometers Converter.” Reeliy, 2026, https://reeliy.com/converters/convert-nm-to-micrometer.