Chain to Millimeter Converter
Length · unit-converter
Convert Chain to Millimeter 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: Millimeter (mm)
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 Millimeter
The millimeter is a metric unit equal to one thousandth of a meter (0.001 m). It is used for precision engineering, 3D printing, and small tolerances.
How to convert chains to millimeters
1 chain is equal to 20116.79999999999927 millimeter:
1 chain = (20.1168 m ÷ 0.001 m) mm = 20116.79999999999927 mm
Each chain is defined as 20.1168 m and each millimeter as 0.001 m, so one chain equals 20.1168 ÷ 0.001 mm = 20116.79999999999927 mm.
Let d(chain) be the numeric value of the same length measured in Chain (chain), and d(mm) the value in Millimeter (mm). Then:
d(mm) = d(chain) × (20.1168 / 0.001)
Equivalently, divide by how many chain fit into one mm (meters per mm divided by meters per chain):
d(mm) = d(chain) ÷ 0.00004970969538
Or: millimeter = chain ÷ 0.00004970969538
Examples
Example #1: Convert 20 chain to millimeter
20 chain = 20 chain × (20.1168/0.001) mm = 402336 mm
20 chain = 20 chain ÷ 0.00004970969538 = 402336 mm
Example #2: Convert 50 chain to millimeter
50 chain = 50 chain × (20.1168/0.001) mm = 1005840 mm
50 chain = 50 chain ÷ 0.00004970969538 = 1005840 mm
Summary
To convert Chain to Millimeter, multiply the value in chain by the ratio of meters per chain divided by meters per mm. Equivalently: value_mm = value_chain × (20.1168 / 0.001). Numerically, 1 chain equals 20116.8 mm.
Relationship context
You are converting between US customary / imperial (Chains) and metric (SI) (Millimeters). Metric units are decimal; imperial units use inches, feet, yards, and miles tied to the international yard definition. Nautical miles are defined in meters (1 nmi = 1,852 m). This tool uses SI-based factors so results stay consistent with modern standards.
Conversion tables
| Chain (chain) | Millimeter (mm) |
|---|---|
| 0.1 | 2,011.68 |
| 1 | 20,116.8 |
| 2 | 40,233.6 |
| 3 | 60,350.4 |
| 4 | 80,467.2 |
| 5 | 100,584 |
| 6 | 120,700.8 |
| 7 | 140,817.6 |
| 8 | 160,934.4 |
| 9 | 181,051.2 |
| Chain (chain) | Millimeter (mm) |
|---|---|
| 10 | 201,168 |
| 20 | 402,336 |
| 30 | 603,504 |
| 40 | 804,672 |
| 50 | 1,005,840 |
| 60 | 1,207,008 |
| 70 | 1,408,176 |
| 80 | 1,609,344 |
| 90 | 1,810,512 |
| 100 | 2,011,680 |