About the Climbing Grade Converter
The Climbing Grade Converter looks up a rock climbing route grade given in the Yosemite Decimal System (YDS), the scale most commonly used in the United States, and returns its widely used equivalent in the French sport grading scale and the UIAA scale used across parts of Europe. It is meant for translating grades between systems, not for calculating difficulty from scratch.
How It Works
Select a YDS grade from the dropdown, covering 5.6 through 5.14a with the letter increments (a, b, c, d) used at 5.10 and above. The calculator looks up that exact grade in a fixed conversion table and returns its French grade and UIAA grade, both drawn from commonly cited consensus equivalencies rather than any calculated conversion.
Examples
5.10a To French And UIAA
The calculator's default grade, YDS 5.10a, converts to French 6a+ and UIAA VI+, the commonly cited equivalent for a lower-end 5.10 sport or trad route.
5.12c To French And UIAA
Selecting YDS 5.12c returns French 7c+ and UIAA IX-, reflecting where that grade sits among the harder end of the 5.12 range in both other systems.
Advantages
- Gives both a French and a UIAA equivalent for a YDS grade in one lookup, useful when a guidebook or gym uses a scale you don't climb under regularly.
- Uses a fixed dropdown of standard YDS grades rather than free text entry, avoiding typos or invalid grade formats.
- Covers a wide range, 5.6 through 5.14a, spanning from beginner-friendly routes to advanced sport climbing grades.
Common Mistakes
- Treating the French or UIAA output as an exact numeric equivalent instead of a widely used approximation; the calculator's own note states the same numerical grade can feel different from crag to crag.
- Using this tool to convert a bouldering grade, such as the V-scale or Font scale, when it is built specifically for roped route grades (YDS), not bouldering.
- Assuming equal steps in YDS always correspond to equal steps in French or UIAA, when some adjacent YDS grades, like 5.10c and 5.10d, map to the same UIAA band while others span a full step.
Edge Cases to Watch For
- Only the 21 specific YDS grades in the dropdown, 5.6 through 5.14a, are supported, and there is no way to enter an intermediate or plus/minus modifier some climbers use informally, like 5.10+.
- The lookup falls back to the 5.10a row if a grade is not found in the table, so in principle any input that doesn't exactly match a listed key would silently return the 5.10a conversion rather than an error, though the dropdown format normally prevents this from happening.
- The table is not evenly spaced: 5.10c and 5.10d both convert to UIAA VII despite being different YDS grades, which shows the mapping reflects consensus difficulty judgments rather than a strict linear scale.
Common Use Cases
- US-trained climbers planning a trip abroad and wanting to gauge route difficulty from a French-graded guidebook or topo.
- Climbers cross-referencing an online route database that lists French or UIAA grades against the YDS grades used at their home gym or crag.
- Route setters or coaches quickly checking grade equivalents when writing training plans that reference international grading systems.