Length and Area
chtomi
Convert chains (ch) to miles (mi).
Factor1 ch = 0.0125 mi
Converter
ch
Accepts numbers or expressions, e.g. 150 + 14.7
Result
mi
Rendered to 6 significant figures.
Formula
Formula
mi = ch × 0.0125
Multiply any value in chains by 0.0125 to obtain the value in miles.
Worked example
Convert 80 ch to mi.
- 01Start with 80 ch.
- 02Multiply by the conversion factor: 80 × 0.0125 = 1 mi.
Result80 ch = 1 mi
Conversion table
| ch | mi |
|---|---|
| 1 | 0.0125 |
| 2 | 0.025 |
| 5 | 0.0625 |
| 10 | 0.125 |
| 20 | 0.25 |
| 50 | 0.625 |
| 100 | 1.25 |
| 200 | 2.5 |
| 500 | 6.25 |
| 1000 | 12.5 |
Reference values rounded to 5 significant figures for display.
FAQ
What is the conversion factor from ch to mi?
1 ch equals 0.0125 mi. To convert, multiply the value in chains by 0.0125.
How do I convert 1 ch to mi?
1 ch = 0.0125 mi. For any value, multiply by 0.0125.
How do I convert mi back to ch?
Divide by the same factor — or equivalently, multiply by 80. So 1 mi = 80 ch.
When would I need to convert chain (Gunter's chain) to mile?
Length conversions appear in piping, layout, and mechanical drawings — particularly when reconciling imperial fittings or instrument lengths with metric plant drawings.
Is the conversion exact?
The factor shown is precise to at least 7 significant figures. For most process-engineering work this is far better than instrument accuracy. For metrology or trade applications, refer to the relevant national standard (NIST, BIPM, ISO 80000).