To convert nanometers to km, multiply by 1e-12.
The calculation uses 1 nm = 1e-12 km. Results are displayed to at most 10 significant digits. Definitions can be exact while a displayed decimal is rounded. Match the displayed precision to your original measurement.
The formula
value in km = value in nm × 1e-12
nm- Input unit: nanometers
km- Output unit: km
How to use this calculator
- Enter a value in nm.
- Multiply by the stored conversion factor.
- Read the result in km; divide by the same factor to convert back.
Worked examples
Worked conversion
1 nm × 1e-12 ≈ 1e-12 km.
Reverse conversion
1e-12 km ÷ 1e-12 ≈ 1 nm. Rounding intermediate values can change the last displayed digit.
Frequently asked questions
What factor does this converter use?
It uses 1e-12 km per nm.
Why can another converter show a slightly different answer?
Check the unit convention first (such as US versus Imperial or decimal versus binary), then compare rounding. Measurement uncertainty is separate from the unit conversion.
nm to km table
| nm | km (rounded) |
|---|---|
| 0 | 0 |
| 1 | 1e-12 |
| 2 | 2e-12 |
| 5 | 5e-12 |
| 10 | 1e-11 |
| 100 | 1e-10 |
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