How many rods are in 1 chain?

One chain contains exactly 4 rods.

Why 4 rods per chain?

Gunter designed his chain (66 feet) as 4 rods (4 x 16.5 feet). This made field measurement systematic: measure 4 rods to get 1 chain, 10 chains to get 1 furlong, 8 furlongs to get 1 mile.

Rods to Chains (rd to ch) Converter

1 rd = 0.25 ch

1 Rod equals 0.25 Chains (1 rd = 0.25 ch). Convert Rods to Chains with formula, table, and examples.

One rod equals exactly 0.25 chains (1/4 of a chain). Four rods make one chain. This is the fundamental relationship in English land surveying: the rod is the chain's building block, and 4 rods = 1 chain = 100 links.

How to Convert Rods to Chains

ch = rd ÷ 4

Divide the value in Rods by 4

Take your value in Rods
Divide by 4
Read the result in Chains

Common Rods to Chains Conversions

Rods (rd)	Chains (ch)	Status
0.5 rd	0.125 ch
1 rd	0.25 ch
2 rd	0.5 ch
4 rd	1 ch
5 rd	1.25 ch
10 rd	2.5 ch
20 rd	5 ch
40 rd	10 ch
80 rd	20 ch
100 rd	25 ch
160 rd	40 ch
320 rd	80 ch
500 rd	125 ch
1,000 rd	250 ch

Good to Know About Rods to Chains Conversion

The rod-chain-furlong-mile hierarchy is the imperial system's most elegant internal structure: 4-10-8 (rods to chains to furlongs to miles). Gunter designed the chain to create decimal arithmetic within a non-decimal system. The 4:1 rod-to-chain ratio was his starting point.

Rods to Chains: What You Need to Know

4 rods = 1 chain. 40 rods = 1 furlong = 10 chains. 320 rods = 1 mile = 80 chains. The rod-to-chain ratio of 4:1 is the simplest relationship in the imperial distance hierarchy.

What is a Rod? rd

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

Imperial land surveying historical

Learn more about Rod →

What is a 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.

Imperial land surveying US public land

Learn more about Chain →

Going the other way? Use our Chains to Rods converter.

Rods to Chains FAQ

One rod equals exactly 0.25 chains (1/4 of a chain). Four rods make one chain.
One chain contains exactly 4 rods.
Gunter designed his chain (66 feet) as 4 rods (4 x 16.5 feet). This made field measurement systematic: measure 4 rods to get 1 chain, 10 chains to get 1 furlong, 8 furlongs to get 1 mile.

Non-Frequently Asked Questions About Rods to Chains

Questions nobody should ask - but someone did.

It is one of the simplest. 4 rods = 1 chain, 10 chains = 1 furlong, 8 furlongs = 1 mile. The chain system is internally elegant: base-4 (rods), base-10 (chains to furlongs), base-8 (furlongs to miles). It is a mixed-radix system that somehow works.
The chain itself was the answer. A Gunter's chain was exactly 4 rods (66 feet) long with 100 links. The surveyor did not count rods; they laid the chain. The chain was a self-measuring instrument. Brilliant engineering for the 1620s.
100 rods / 4 = 25 chains. 100 rods of fence encloses 25 chains of boundary. In modern terms, that is about 503 m of fence. Enough for a 125 m x 125 m paddock, or about 1.56 hectares. Medieval fencing math still works.