A nautical mile is exactly 1,852 meters.
Nautical miles to Chains Converter — nmi to ch
Convert Nautical mile (nmi) to Chain (ch) using the exact conversion factor (1 nautical mile = 92.06235584 chain). See the formula, worked examples, conversion table, history, and common uses.
Nautical miles to Chains converter
Converter
Length Converter
Convert SI, imperial, US customary, astronomical, scientific, and historical length units.
Context values
Some unit families need one extra value for a physically accurate result.
A surveyor's chain is 66 feet.
Result = input x 1852 / 20.1168.
Length uses the meter as the base unit.
Reserved above the conversion cards and below the converter.
About Converting Nautical miles to Chains
Nautical mile and Chain both measure length. Nautical mile is most often used for marine and aviation distance and navigation.
Formula
chains = nautical miles × 92.0623558419
This factor comes from each unit's defined relationship to the category's base unit: 1 nautical mile equals 1852 base units, and 1 chain equals 20.1168 base units, so dividing one by the other gives the direct nautical mile-to-chain factor of 92.0623558419.
Simple example
1 nmi × 92.06235584 = 92.06235584 ch
1 nautical mile = 92.06235584 chains.
Real-world example
10 nmi × 92.06235584 = 920.6235584 ch
10 nautical miles = 920.6235584 chains.
Conversion table
| Nautical mile (nmi) | Chain (ch) |
|---|---|
| 1 nmi | 92.06235584 ch |
| 5 nmi | 460.3117792 ch |
| 10 nmi | 920.6235584 ch |
| 21.0975 nmi | 1,942.285552 ch |
| 42.195 nmi | 3,884.571105 ch |
| 100 nmi | 9,206.235584 ch |
Reverse conversion: Chain to Nautical mile
92.06235584 ch × 0.01086220302 = 1 nmi
92.06235584 chains = 1 nautical miles.
nautical miles = chains × 0.0108622030238
For a page dedicated to this direction, see Chain to Nautical mile.
Understanding the Nautical mile
Nautical mile (nmi) measures distance. The international nautical mile is defined as exactly 1,852 meters, standardized in 1929. It is classified as a Non-SI unit accepted for use with SI (maritime/aviation).
Where it's used: Used internationally in maritime navigation and aviation.
Uses of the Nautical mile today
- Marine and aviation distance and navigation
- Basis for the knot (nautical miles per hour)
History of the Nautical mile
The nautical mile was historically defined as one minute of latitude along a meridian, directly tying sea navigation to the Earth's geometry, which made it practical for chart-based navigation using a ship's known latitude. The International Hydrographic Bureau standardized it at exactly 1,852 meters in 1929, a value close to the traditional latitude-based definitions used by different countries.
Historical origin. Nautical mile was not the invention of a single named person; it developed through the process described above.
Understanding the Chain (ch)
A surveyor's chain is 66 feet.
Nautical mile — sources
- BIPM SI Brochure — Non-SI units accepted for use with SI — Lists the nautical mile among accepted non-SI units.
Reserved between the cards and the FAQ so the page stays balanced.
Frequently asked questions
How many chains are in 1 nautical mile?
1 nautical mile equals 92.06235584 chains, using the exact defined conversion factor rather than an estimate.
How do I convert nautical mile to chain?
Multiply the nautical mile value by 92.06235584. The converter above does this instantly to whatever precision you set.
How do I convert chain back to nautical mile?
Use the reverse factor: 1 chain equals 0.010862203 nautical miles. You can also use the swap control in the converter above to flip the direction instantly.
What is a nautical mile?
Nautical mile (nmi) measures distance. The international nautical mile is defined as exactly 1,852 meters, standardized in 1929. It is classified as a Non-SI unit accepted for use with SI (maritime/aviation).
What is a chain?
Chain (ch) is a unit of length.
Is the nautical mile to chain conversion exact?
Yes. The international nautical mile is defined as exactly 1,852 meters, standardized in 1929. That fixed definition is what the converter above uses, so any rounding you see is a display choice, not a limitation of the math.
Where is the nautical mile still used today?
Used internationally in maritime navigation and aviation.