# Chains to Rods (ch to rd)

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

**1 ch = 4 rd**

One chain equals exactly 4 rods (perches/poles). This is a fundamental relationship in the English land measurement system: the chain was deliberately designed as 4 rods. Both units come from the same surveying tradition, and this conversion appears frequently in historical property descriptions.

## Formula

Convert Chains to Rods

## Conversion Table

| Chains (ch) | Rods (rd) |
|---|---|
| 0.25 ch | 1 rd |
| 0.5 ch | 2 rd |
| 1 ch | 4 rd |
| 2 ch | 8 rd |
| 5 ch | 20 rd |
| 10 ch | 40 rd |
| 20 ch | 80 rd |
| 40 ch | 160 rd |
| 80 ch | 320 rd |
| 100 ch | 400 rd |
| 200 ch | 800 rd |
| 500 ch | 2000 rd |
| 1000 ch | 4000 rd |

## Units

### Chain (ch)

Exactly 66 feet or 4 rods (20.1168 m). Invented by Edmund Gunter for land surveying. 80 chains make one mile. Still used in US public land surveys.

### Rod (rd)

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

## Background

Since 1 rod = 16.5 feet and 1 chain = 66 feet, the ratio is exactly 66/16.5 = 4. A furlong (10 chains) equals 40 rods. One mile (80 chains) equals 320 rods. Old deeds often mix chains and rods in the same boundary description, making this conversion practically important for historical land research.

## Good to Know

The chain-rod relationship (4:1) is one of the few clean ratios in the imperial system. Gunter designed his chain to be compatible with the existing rod, just as he designed it to create clean acre calculations. The chain was a masterpiece of backward compatibility.

## FAQ

### How many rods are in 1 chain?

One chain equals exactly 4 rods (also called perches or poles). This is an exact defining relationship: 1 chain = 4 rods = 66 feet.

### How do I convert chains to rods?

Multiply the number of chains by 4. For example, 15 chains = 60 rods. The conversion is exact with no rounding needed.

### Why does 1 chain equal 4 rods?

The chain (66 feet) was designed as 4 rods (4 x 16.5 feet) to maintain compatibility with existing rod-based land measurements. The rod was already established when Gunter introduced his chain around 1620.

## Non-Frequently Asked Questions

### If I have a rod and a chain, which wins in a fight?

A chain (66 feet / 4 rods) is four times longer than a rod (16.5 feet). But a rod (also called perch or pole) is a solid stick, while a chain is flexible metal links. In a hypothetical unit fight, the rod has better structural integrity but shorter reach. We do not endorse unit violence.

### Why are there exactly 4 rods in a chain?

Because 4 x 16.5 feet = 66 feet = 1 chain. Gunter designed the chain as 4 rods to make area calculation simple: 1 rod x 1 furlong = 1 rood (quarter acre), 1 chain x 1 furlong = 1 acre. Everything connects through the rod.

### Is a fishing rod the same as a surveying rod?

No. A fishing rod is for catching fish. A surveying rod (perch/pole) is exactly 16.5 feet and measures land. One rod feeds you; the other tells you where to farm. Both are useful sticks but in very different ways.

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## See Also

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