Convert meters to nanometers or nanometers to meters, with formulas plus micrometer, millimeter, and scientific notation equivalents.
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m to Nanometers Formula
The calculator uses one of two formulas depending on the direction you select.
Meters to nanometers:
Nanometers to meters:
- m = length in meters
- nm = length in nanometers
One nanometer equals 10⁻⁹ meters. The conversion is exact, so no rounding is required other than what fits your display. Move the decimal point nine places: right when going from meters to nanometers, left when going the other way.
Reference Tables
Common conversions between meters and nanometers:
| Meters (m) | Nanometers (nm) |
|---|---|
| 1 m | 1,000,000,000 nm |
| 0.001 m (1 mm) | 1,000,000 nm |
| 0.000001 m (1 µm) | 1,000 nm |
| 7 × 10⁻⁷ m | 700 nm |
| 4 × 10⁻⁷ m | 400 nm |
| 1 × 10⁻⁹ m | 1 nm |
Typical lengths to help you sanity-check a result:
| Object | Approximate size |
|---|---|
| Hydrogen atom diameter | ~0.1 nm |
| DNA double helix width | ~2 nm |
| Virus particle | 20–300 nm |
| Visible light wavelength | 380–700 nm |
| Bacterium | 1,000–10,000 nm |
| Human hair diameter | ~80,000 nm |
Worked Examples
Example 1. Convert 0.00000045 m to nanometers.
0.00000045 × 1,000,000,000 = 450 nm. That falls inside the visible-light range (blue light).
Example 2. Convert 1,500 nm to meters.
1,500 ÷ 1,000,000,000 = 0.0000015 m, or 1.5 × 10⁻⁶ m (1.5 µm).
Example 3. Convert 0.5 m to nanometers.
0.5 × 1,000,000,000 = 500,000,000 nm.
FAQ
How many nanometers are in a meter? Exactly 1,000,000,000 (one billion).
How do I convert nm to m quickly? Divide by 10⁹, or shift the decimal point nine places to the left.
Why do wavelengths use nanometers? Visible light sits between roughly 380 and 700 nm. Using nanometers keeps the numbers small and readable instead of writing 3.8 × 10⁻⁷ m.
Is 1 nm the same as 1 millimicron? Yes. Millimicron is an older term for nanometer and is no longer used in SI.
