How to Convert Nanometres to Nautical miles (nm to nmi)
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 nautical miles by hand, with examples and a quick-reference table.
The conversion
To convert nanometres to nautical miles, multiply the value by 5.399568e-13. To go the other way, divide by the same number (or multiply by 1.852000e+12). Because the factor is tiny, scientific notation keeps the numbers manageable.
Nautical miles = nanometres × 5.399568e-13
Worked examples
- 3 nm = 1.619870e-12 nmi
- 12.5 nm = 6.749460e-12 nmi
- 75 nm = 4.049676e-11 nmi
Nanometres to Nautical miles table
| Nanometres | Nautical miles |
|---|---|
| 1 nm | 5.399568e-13 nmi |
| 2 nm | 1.079914e-12 nmi |
| 5 nm | 2.699784e-12 nmi |
| 10 nm | 5.399568e-12 nmi |
| 20 nm | 1.079914e-11 nmi |
| 25 nm | 1.349892e-11 nmi |
| 50 nm | 2.699784e-11 nmi |
| 100 nm | 5.399568e-11 nmi |
| 250 nm | 1.349892e-10 nmi |
| 500 nm | 2.699784e-10 nmi |
| 1,000 nm | 5.399568e-10 nmi |
Common questions
Is nm to nmi 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 Nautical miles to Nanometres converter.
Mistakes to avoid
Rounding the factor too early
Using 3 instead of 3.28 for feet per metre introduces an error of almost 9% before you have started.
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.
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
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.
A conversion table is handy for common values, but a calculator is faster and avoids interpolation errors for anything in between.
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.
For any value, use the Nanometres to Nautical miles Converter or browse all length converters.
Run your own numbers: Nanometres to Nautical miles Converter