How many nautical miles is 1 furlong?

1 furlong equals approximately 0.108622 nautical miles. One furlong is exactly 201.168 meters, and one nautical mile is exactly 1,852 meters, giving a factor of 201.168 / 1852 ≈ 0.108622.

A furlong is a unit of length in the imperial system equal to 1/8 of a mile, or exactly 201.168 meters (660 feet). It is most commonly used today in horse racing.

What is a nautical mile?

A nautical mile is a unit of length used in maritime and air navigation, defined as exactly 1,852 meters. It corresponds to one minute of arc of latitude along any meridian.

How do I convert furlongs to nautical miles manually?

Multiply the number of furlongs by 0.108622. For example, 5 furlongs × 0.108622 = 0.54311 nautical miles.

Is the conversion factor exact?

Both base units have exact SI definitions (1 furlong = 201.168 m; 1 NM = 1852 m), so the factor 201.168 / 1852 is exact in decimal, rounded here to 6 significant figures.

Furlongs to Nautical Miles Converter

Enter a length in furlongs and get the equivalent in nautical miles with the formula and a reference table.

Furlongs to Nautical Miles

Length in Furlongs

Quick Reference Table

Furlongs	Nautical Miles

1 furlong = 201.168 m | 1 nautical mile = 1,852 m | Factor: 201.168 / 1852 ≈ 0.108622

Summary

This tool converts a length in furlongs to nautical miles using the exact conversion factor: 1 furlong = 0.108622 nautical miles. Enter any value and the result appears immediately alongside the formula and a worked example. A reference table for common furlong values is also included for quick lookup.

How it works

Enter the number of furlongs in the input field.
The tool multiplies your value by the conversion factor (1 furlong = 0.108622 NM).
The result in nautical miles is displayed instantly.
A worked formula shows each arithmetic step.
Browse the reference table for common pre-calculated values.

Use cases

Convert horse-racing course distances (measured in furlongs) to nautical miles.
Academic unit-conversion exercises and homework.
Cross-referencing historical land and sea distances.
Navigation and geography problems that mix imperial and maritime units.
Checking conversion formulas for technical documents.
Quickly building unit-conversion tables without a calculator.

Frequently Asked Questions

Last updated: 2026-10-05 · Reviewed by Nham Vu