How to Convert Nanometres to Kilometres (nm to km)
Length conversions come up when reading overseas furniture specs, cycling the Round Island Route in kilometres while a foreign app shows miles, or checking marine distances in the Singapore Strait in nautical miles. This guide shows how to convert nanometres into kilometres by hand, with examples and a quick-reference table.
The conversion
To convert nanometres to kilometres, multiply the value by 1.000000e-12. To go the other way, divide by the same number (or multiply by 1.000000e+12). Because the factor is tiny, scientific notation keeps the numbers manageable.
Kilometres = nanometres × 1.000000e-12
Worked examples
- 3 nm = 3.000000e-12 km
- 12.5 nm = 1.250000e-11 km
- 75 nm = 7.500000e-11 km
Nanometres to Kilometres table
| Nanometres | Kilometres |
|---|---|
| 1 nm | 1.000000e-12 km |
| 2 nm | 2.000000e-12 km |
| 5 nm | 5.000000e-12 km |
| 10 nm | 1.000000e-11 km |
| 20 nm | 2.000000e-11 km |
| 25 nm | 2.500000e-11 km |
| 50 nm | 5.000000e-11 km |
| 100 nm | 1.000000e-10 km |
| 250 nm | 2.500000e-10 km |
| 500 nm | 5.000000e-10 km |
| 1,000 nm | 1.000000e-9 km |
Common questions
Is nm to km exact?
The factors used here are the internationally defined values where they exist; results are rounded for display only.
How do I convert back?
Use the Kilometres to Nanometres converter.
Mistakes to avoid
Forgetting squared and cubed units
Area and volume factors are the length factor squared or cubed, so 1 m² is about 10.76 sq ft, not 3.28.
Dropping the units
A bare number without a unit is easy to misread later. Always write the unit with the result.
Multiplying when you should divide
Converting to a smaller unit gives a bigger number, and converting to a larger unit gives a smaller one. If your answer moves the wrong way, you have inverted the factor.
Background
Unit conversion is simply multiplication by a fixed ratio. The ratio between two units of the same quantity never changes, so once you know it you can convert any value in either direction.
Singapore adopted the metric system in the 1970s, replacing imperial units and traditional Chinese measures in most official uses. Metric units are now standard in schools, trade and government, but older units survive in property, markets and imported goods.
Many conversion factors are exact by definition. The inch has been defined as exactly 2.54 centimetres since 1959, and the pound as exactly 0.45359237 kilograms, so conversions involving them can be as precise as you need.
For any value, use the Nanometres to Kilometres Converter or browse all length converters.
Run your own numbers: Nanometres to Kilometres Converter