Fathoms to Chains Converter

Conversion Updated 15 Jun 2026

This Fathoms to Chains Converter lets you convert Fathoms (fth) into Chains (ch) in one step. Enter a value in fathoms and you'll instantly see the equivalent in chains, worked out with the formula ch = fth x 0.0909090909090909. It's handy whenever you need a quick, precise fathoms-to-chains conversion without doing the arithmetic by hand.

  • Conversion constants are fixed and do not vary by region.

Formula

ch = fth x 0.0909090909090909
  • To convert fathoms to chains, multiply your value by the fixed factor 0.090909090909 (so 1 fth = 0.090909090909 ch).
  • The factor comes from the internationally agreed definitions of each unit, so it never changes.
  • Displayed results are rounded for readability, but the full-precision value is used in the calculation.

Example

Inputs
  • Fathoms (fth): 100

Start with 100 fth. Multiply by 0.090909090909 to get 9.090909090909 ch.

Frequently asked questions

How do I convert fathoms to chains?
Multiply the number of fathoms by 0.090909090909. For example, 100 fth equals 9.090909090909 ch.
Are these conversion factors accurate?
Yes. The calculator uses internationally accepted definitions for each unit, so the conversion factor is exact.
Why can tiny differences appear after conversion?
Very small differences are only a display effect from rounding the output. The underlying calculation keeps full precision.