# Rods to Fathoms (rd to ftm)

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

**1 rd = 2.75 ftm**

One rod equals approximately 2.75 fathoms. Since 1 rod = 16.5 feet and 1 fathom = 6 feet, divide 16.5 by 6. The rod measures land; the fathom measures sea depth. Both are English units derived from the foot, serving perpendicular directions.

## Formula

Convert Rods to Fathoms

## Conversion Table

| Rods (rd) | Fathoms (ftm) |
|---|---|
| 0.25 rd | 0.6875 ftm |
| 0.5 rd | 1.375 ftm |
| 1 rd | 2.75 ftm |
| 2 rd | 5.5 ftm |
| 4 rd | 11 ftm |
| 5 rd | 13.75 ftm |
| 10 rd | 27.5 ftm |
| 20 rd | 55 ftm |
| 40 rd | 110 ftm |
| 100 rd | 275 ftm |
| 160 rd | 440 ftm |
| 320 rd | 880 ftm |
| 500 rd | 1375 ftm |
| 1000 rd | 2750 ftm |

## Units

### Rod (rd)

Exactly 16.5 feet or 5.5 yards (5.0292 m). Also called a perch or pole. Historically used in land surveying.

### 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.

## Background

A rod is 2.75 fathoms. 4 rods (1 chain) = 11 fathoms. A 40-rod furlong = 110 fathoms. The rod and fathom are both foot-based but serve different environments: horizontal land and vertical sea.

## Good to Know

The rod and fathom are English measurement's land-sea pair. Both derive from the foot: the rod is 16.5 feet (horizontal land); the fathom is 6 feet (vertical depth). At the coast, one becomes the other. The rod walks the beach; the fathom wades into the water.

## FAQ

### How many fathoms is 1 rod?

One rod equals exactly 2.75 fathoms (16.5 feet / 6 feet per fathom).

### How many rods is 1 fathom?

One fathom equals approximately 0.3636 rods (about 4/11 of a rod).

### When is this conversion used?

In coastal surveys where land boundaries (rods) meet underwater features (fathoms).

## Non-Frequently Asked Questions

### Is a rod horizontal and a fathom vertical?

Traditionally yes. Rods measured along the ground; fathoms measured down into the water. But both are just lengths. A rod could measure depth and a fathom could measure land. The convention is environmental, not mathematical. Units do not know which direction they point.

### How many fathoms deep is 1 rod of earth?

A rod laid vertically into the ground = 2.75 fathoms = 5.03 m. That is deeper than most building foundations (1-3 m) but shallower than most wells (5-20 m). A rod of depth reaches the water table in many areas. The rod accidentally measures groundwater access depth.

### If you stood a rod upright in the ocean, how deep would it reach?

2.75 fathoms = about 5 m. Average ocean depth is about 2,024 fathoms (3,700 m). Your rod reaches 0.14% of average ocean depth. A rod in the ocean is a toothpick in a swimming pool. The ocean is deeper than the rod imagines.

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## See Also

- [Fathoms to Rods](https://www.unitconvertercalculator.com/length/fathoms-to-rods/)