# Fathoms to Nautical Miles (ftm to nmi)

Source: https://www.unitconvertercalculator.com/length/fathoms-to-nautical-miles/

**1 ftm = 0.00098747300215983 nmi**

One fathom equals approximately 0.000988 nautical miles, or about 1/1,012 of a nautical mile. A nautical mile (1,852 m) contains about 1,012.7 fathoms. Both units are maritime, but they measure different things: fathoms measure depth vertically, nautical miles measure distance horizontally.

## Formula

Convert Fathoms to Nautical Miles

## Conversion Table

| Fathoms (ftm) | Nautical Miles (nmi) |
|---|---|
| 1 ftm | 0.00098747300215983 nmi |
| 5 ftm | 0.0049373650107991 nmi |
| 10 ftm | 0.0098747300215983 nmi |
| 50 ftm | 0.049373650107991 nmi |
| 100 ftm | 0.098747300215983 nmi |
| 500 ftm | 0.49373650107991 nmi |
| 1000 ftm | 0.98747300215983 nmi |
| 1013 ftm | 1.0003101511879 nmi |
| 5000 ftm | 4.9373650107991 nmi |
| 6000 ftm | 5.924838012959 nmi |
| 10000 ftm | 9.8747300215983 nmi |

## Units

### Fathom (ftm)

Exactly 6 feet (1.8288 m). Traditionally used to measure water depth in nautical contexts. Originally based on the span of outstretched arms.

### Nautical Mile (nmi)

Exactly 1852 meters by international agreement. Based on one minute of arc of latitude at the Earth's surface. The standard unit for maritime and air navigation.

## Background

About 1,013 fathoms make one nautical mile. The Challenger Deep at 6,011 fathoms is about 5.93 nautical miles deep. A shipping channel at 10 fathoms is about 0.0099 nautical miles deep. Both units live in the same maritime world but on perpendicular axes: depth vs. distance.

## Good to Know

On a nautical chart, fathoms run vertically (depth soundings) while nautical miles run horizontally (distance scales). The two units share the same sheet of paper but measure perpendicular dimensions. This is the only place where both units naturally coexist.

## FAQ

### How many nautical miles is 1 fathom?

One fathom equals approximately 0.000988 nautical miles (about 1/1,013 of a nautical mile). Since 1 fathom = 1.8288 m and 1 NM = 1,852 m.

### How many fathoms are in 1 nautical mile?

One nautical mile contains approximately 1,012.7 fathoms. Since 1 NM = 1,852 m and 1 fathom = 1.8288 m, divide 1,852 by 1.8288.

### Are fathoms and nautical miles both used at sea?

Yes, but differently. Fathoms measure depth (vertical). Nautical miles measure distance (horizontal). A chart might show '20 fathoms depth, 5 NM from shore.' Both are essential maritime units serving different purposes.

## Non-Frequently Asked Questions

### Why does the ocean use two different units for depth and distance?

Fathoms measure how deep (vertical). Nautical miles measure how far (horizontal). A ship sailing 100 nautical miles over 10 fathoms of water has traveled 100 NM horizontally and 0 NM vertically. Different axes, different units. Perfectly logical, thoroughly confusing.

### How many fathoms per nautical mile if I sank straight down?

One nautical mile is about 1,013.3 fathoms. If you could sink straight down at 1 NM, you would be at 1,013 fathoms - about 1,852 meters. That is roughly the depth of the continental slope. Serious diving territory.

### Is the ocean wider or deeper in nautical terms?

The Pacific Ocean is about 9,600 NM wide and about 5.95 NM deep (at the Mariana Trench). So it is about 1,613 times wider than it is deep. The ocean is basically a very thin, very wide sheet of water when measured in the same unit.

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## See Also

- [Nautical Miles to Fathoms](https://www.unitconvertercalculator.com/length/nautical-miles-to-fathoms/)