Nautical Miles to Fathoms
Convert nautical miles to fathoms instantly. 1 nmi = 1012.6859142607 ftm. Includes the exact factor, a conversion table of common values and the definition of both units.
How to convert nautical miles to fathoms
To convert nautical miles to fathoms, multiply by 1012.6859142607. The relationship is fixed, so the same factor works for any quantity — there is nothing to look up and nothing that changes with temperature, location or context.
ftm = nmi × 1012.6859142607
Nautical Miles to Fathoms conversion table
The values people look up most often, rounded for reading. Use the calculator above for anything in between.
| Nautical Miles | Fathoms |
|---|---|
| 1 nmi | 1,012.69 ftm |
| 2 nmi | 2,025.37 ftm |
| 3 nmi | 3,038.06 ftm |
| 5 nmi | 5,063.43 ftm |
| 10 nmi | 10,126.86 ftm |
| 20 nmi | 20,253.72 ftm |
| 25 nmi | 25,317.15 ftm |
| 50 nmi | 50,634.3 ftm |
| 100 nmi | 101,268.59 ftm |
| 500 nmi | 506,342.96 ftm |
| 1,000 nmi | 1,012,685.91 ftm |
What is a nautical mile?
One minute of latitude, fixed at exactly 1,852 m. Used at sea and in the air.
What is a fathom?
Six feet. The traditional unit for water depth on nautical charts.
The formula
ftm = nmi × 1012.6859142607
Every result on this page comes from this formula. Nothing is rounded until the final display, so figures match a spreadsheet to the cent.
How to use the Nautical Miles to Fathoms
- Type the number of nautical miles you want to convert.
- Read the result in fathoms straight away — there is no button to press.
- Check the table below for the values that come up most often, or reverse the conversion with the linked fathoms to nautical miles page.
Nautical Miles to Fathoms — frequently asked questions
How many fathoms are in a nautical mile?
One nautical mile equals 1012.6859142607 ftm. ftm = nmi × 1012.6859142607
What is the formula to convert nautical miles to fathoms?
The formula is ftm = nmi × 1012.6859142607. It is an exact definition rather than an approximation, so the conversion never drifts no matter how large the number.
How do I convert fathoms back to nautical miles?
Divide instead of multiplying: one fathom is 0.000987473 nmi. The reverse converter is linked in the related tools list.
Is this conversion exact?
Yes. Both units are defined against the same base unit by international agreement, so the factor is exact — any rounding you see is only in the display, which you can widen by entering more decimal places.
Is this nautical miles to fathoms free to use?
Yes. Every calculator on the site is free, needs no sign-up, and runs entirely in your browser, so your figures never leave your device.
What people search for
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About this calculator
Written and reviewed by The Samsung Calculator editorial team. Every calculator is written against a published formula, reviewed against at least one independent reference implementation, and dated when it changes.
Last reviewed August 15, 2026 · Calculation runs client-side · No data collected · Report an error