Chain to Mile Converter
Length · unit-converter
Convert Chain to Mile with a fixed input and output unit, step-by-step formula line, and reference tables. All calculations use SI-based definitions (international yard, nautical mile, etc.).
Calculator
From: Chain (chain)
To: Mile (mi)
About Chain
The chain is a surveying unit equal to 66 feet (20.1168 meters) exactly. It appears in land measurement and legacy civil engineering records.
About Mile
The statute mile is a US customary and imperial unit equal to exactly 1,609.344 meters. It is widely used for road distances in the United States and the United Kingdom.
How to convert chains to miles
1 chain is equal to 0.0125 mile:
1 chain = (20.1168 m ÷ 1609.344 m) mi = 0.0125 mi
Each chain is defined as 20.1168 m and each mile as 1609.344 m, so one chain equals 20.1168 ÷ 1609.344 mi = 0.0125 mi.
Let d(chain) be the numeric value of the same length measured in Chain (chain), and d(mi) the value in Mile (mi). Then:
d(mi) = d(chain) × (20.1168 / 1609.344)
Equivalently, divide by how many chain fit into one mi (meters per mi divided by meters per chain):
d(mi) = d(chain) ÷ 80
Or: mile = chain ÷ 80
Examples
Example #1: Convert 20 chain to mile
20 chain = 20 chain × (20.1168/1609.344) mi = 0.25 mi
20 chain = 20 chain ÷ 80 = 0.25 mi
Example #2: Convert 50 chain to mile
50 chain = 50 chain × (20.1168/1609.344) mi = 0.625 mi
50 chain = 50 chain ÷ 80 = 0.625 mi
Summary
To convert Chain to Mile, multiply the value in chain by the ratio of meters per chain divided by meters per mi. Equivalently: value_mi = value_chain × (20.1168 / 1609.344). Numerically, 1 chain equals 0.0125 mi.
Relationship context
Both units belong to US customary / imperial length. Conversions often use simple ratios (for example inches and feet), while miles relate to yards and feet through fixed definitions. The numeric factor used here is traceable to the international inch (0.0254 m) and related definitions.
Conversion tables
| Chain (chain) | Mile (mi) |
|---|---|
| 0.1 | 0.00125 |
| 1 | 0.0125 |
| 2 | 0.025 |
| 3 | 0.0375 |
| 4 | 0.05 |
| 5 | 0.0625 |
| 6 | 0.075 |
| 7 | 0.0875 |
| 8 | 0.1 |
| 9 | 0.1125 |
| Chain (chain) | Mile (mi) |
|---|---|
| 10 | 0.125 |
| 20 | 0.25 |
| 30 | 0.375 |
| 40 | 0.5 |
| 50 | 0.625 |
| 60 | 0.75 |
| 70 | 0.875 |
| 80 | 1 |
| 90 | 1.125 |
| 100 | 1.25 |