A metric SI-prefix conversion — “nano” means one billionth, making this useful for wavelengths of light and atomic-scale measurements.
How it works
Multiplying nanometers by 0.000000001 (one billionth) gives meters; multiplying meters by 1,000,000,000 gives nanometers back.
What this does not include
This does not include torque units — this site’s separate nm-to-ft-lb calculator uses “Nm” to mean newton-meters, a completely different quantity from nanometers despite the similar abbreviation.
How to use this calculator
- Enter a value in either nanometers or meters — the other field fills in automatically.
Frequently asked questions
Why is this conversion needed for light wavelengths?
Visible light wavelengths fall in the 380-700 nanometer range, a scale far too small to conveniently express in meters without many leading zeros.
Isn’t “Nm” also used for torque?
Yes, confusingly — newton-meters (torque) and nanometers (length) share a similar abbreviation but measure completely different physical quantities; this calculator is specifically for the length unit.
What’s a practical use for nanometers?
Describing wavelengths of light, the size of viruses and molecules, and semiconductor manufacturing process nodes.
