Micrometers to nanometers (μm to nm) converter

What is a micrometers to nanometers converter?

A micrometers to nanometers converter is an online tool that translates a length expressed in micrometers (μm) into its equivalent in nanometers (nm), and back again. Both units belong to the metric system and sit at the small end of the scale: the micrometer, also called a micron, equals one millionth of a meter, while the nanometer equals one billionth of a meter. Because these magnitudes are hard to picture, a converter removes the guesswork and the risk of miscounting zeros when you move between the two.

The tool is bidirectional. Enter a value in either field and the other side updates immediately, so you can go from μm to nm or from nm to μm without changing any settings.

Where these units are used

Micrometers and nanometers show up wherever very small dimensions matter:

• Microscopy and biology: cell sizes, bacteria, and tissue thickness are often quoted in micrometers, while structures such as viruses or membranes are described in nanometers.
• Semiconductors and electronics: chip feature sizes and film thicknesses span both ranges, and engineers routinely convert between them.
• Materials science: surface roughness, coatings, and particle sizes are measured at this scale.
• Optics and photonics: wavelengths of light fall in the hundreds of nanometers, so optical specifications mix nm and μm.

How does the converter work?

Because a micrometer is one millionth of a meter and a nanometer is one billionth of a meter, one micrometer always contains exactly one thousand nanometers. The converter applies this fixed factor, multiplying or dividing your input as needed. The relationship is exact, so there is no rounding error built into the conversion itself.

Formula for conversion

To convert micrometers to nanometers, multiply by 1000:

$\text{nm} = \text{μm} \times 1000$

To convert nanometers to micrometers, divide by 1000:

$\text{μm} = \text{nm} \div 1000$

The converter also supports imperial units. One inch equals exactly 25.4 millimeters, so:

$\text{nm} = \text{in} \times 25{,}400{,}000$

Conversion table

The table below lists common micrometer values alongside their nanometer equivalents.

Examples

Example 1: One micrometer to nanometers

Convert 1 micrometer to nanometers by multiplying by 1000:

$1 \text{ μm} \times 1000 = 1000 \text{ nm}$

Example 2: Nanometers back to micrometers

Convert 1000 nanometers to micrometers by dividing by 1000:

$1000 \text{ nm} \div 1000 = 1 \text{ μm}$

Example 3: A two-micrometer particle

A particle measuring 2 micrometers across converts to:

$2 \text{ μm} \times 1000 = 2000 \text{ nm}$

Example 4: Converting an inch

If you switch the source unit to inches, 1 inch equals 25.4 mm, which is:

$1 \text{ in} \times 25{,}400{,}000 = 25{,}400{,}000 \text{ nm}$

Notes

• The micrometer to nanometer factor is exactly 1000, with no approximation.
• The micrometer is frequently written as “micron” in older texts and industrial specifications; the two terms mean the same thing.
• Keep an eye on the zeros: it is easy to be off by a factor of ten or a hundred when converting by hand, which is exactly what this tool prevents.
• Mixing the source and target units (for example, inches and nanometers) is fully supported, so you can move between metric and imperial scales in one step.

Frequently asked questions

How many nanometers are in one micrometer?

There are exactly 1000 nanometers in one micrometer. Multiply any micrometer value by 1000 to get nanometers.

How do I convert nanometers back to micrometers?

Divide the number of nanometers by 1000. For example, 1000 nm equals 1 μm and 100,000 nm equals 100 μm.

Is a micron the same as a micrometer?

Yes. “Micron” is an older name for the micrometer. Both equal one millionth of a meter, so 1 micron is 1000 nanometers.

How many nanometers are in 100 micrometers?

Multiply 100 by 1000 to get 100,000 nanometers.

Can this converter handle imperial units like inches?

Yes. If you select inches as the source unit, the converter applies the exact factor of 25.4 mm per inch, so 1 inch equals 25,400,000 nanometers. To work entirely in metric length, you can also use our length converter.

Why are these tiny units useful?

Micrometers and nanometers describe dimensions far too small for everyday rulers, such as cells, light wavelengths, and chip features. Working at the right scale keeps scientific and engineering measurements precise.