To convert mm to chains, multiply by 0.00004970969538.
The calculation uses 1 mm = 0.00004970969538 ch. Results are displayed to at most 10 significant digits. Definitions can be exact while a displayed decimal is rounded. Match the displayed precision to your original measurement.
The formula
value in ch = value in mm × 0.00004970969538
mm- Input unit: mm
ch- Output unit: chains
How to use this calculator
- Enter a value in mm.
- Multiply by the stored conversion factor.
- Read the result in ch; divide by the same factor to convert back.
Worked examples
Worked conversion
1 mm × 0.00004970969538 ≈ 0.00004970969538 ch.
Reverse conversion
0.00004970969538 ch ÷ 0.00004970969538 ≈ 1 mm. Rounding intermediate values can change the last displayed digit.
Frequently asked questions
What factor does this converter use?
It uses 0.00004970969538 ch per mm.
Why can another converter show a slightly different answer?
Check the unit convention first (such as US versus Imperial or decimal versus binary), then compare rounding. Measurement uncertainty is separate from the unit conversion.
mm to ch table
| mm | ch (rounded) |
|---|---|
| 0 | 0 |
| 1 | 0.00004970969538 |
| 2 | 0.00009941939076 |
| 5 | 0.0002485484769 |
| 10 | 0.0004970969538 |
| 100 | 0.004970969538 |
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