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Climbing Grade French → Yosemite Decimal Converter Calculator

Piecewise-linear lookup over the modern grade range.

Convert a French sport-climbing grade entered as a numeric proxy (e.g. 5.0 = French 5a, 6.0 = 6a, 6.5 = 6b, 7.0 = 7a, 7.5 = 7b, 8.0 = 8a) to its approximate Yosemite Decimal System (YDS) equivalent using the standard piecewise mapping (5a ≈ 5.7, 6a ≈ 5.10a, 6c ≈ 5.11c, 7a ≈ 5.11d, 7c ≈ 5.12d, 8a ≈ 5.13b).

Marcus Laurent By Marcus Laurent
Published Last reviewed 1 min read

Inputs

Results

Enter values and click Calculate to see results.
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How to use this calculator

  1. Fill in the inputs above using the units you already have.
  2. Values update automatically as you type — no submit button needed.
  3. Hover any result row for the underlying formula and intermediate values.

Formula

Piecewise lookup of YDS from French grade.

In depth

Convert a French sport-climbing grade entered as a numeric proxy (e.g. 5.0 = French 5a, 6.0 = 6a, 6.5 = 6b, 7.0 = 7a, 7.5 = 7b, 8.0 = 8a) to its approximate Yosemite Decimal System (YDS) equivalent using the standard piecewise mapping (5a ≈ 5.7, 6a ≈ 5.10a, 6c ≈ 5.11c, 7a ≈ 5.11d, 7c ≈ 5.12d, 8a ≈ 5.13b).