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Calcimator

Route Grade Converter

Convert climbing route grades between YDS, French, UIAA, British, and V-scale systems. Instantly translate difficulty ratings across international grading standards.

Inputs

Results

YDS Grade

5.10a

French Grade

6a

Input SystemYDS
UIAA GradeVI
British GradeE2 5c
V-Scale (Bouldering)V3
How to Use This Calculator
  1. Select the grading system you are converting from: YDS (5.x), French (6a/7b), UIAA (VII), British, or V-scale for bouldering.
  2. Enter the grade value using the numeric selector — the scale maps each grade to a comparable difficulty level.
  3. Read all equivalent grades simultaneously in YDS, French, UIAA, British, and V-scale.
  4. Use the French or UIAA equivalent when traveling to European crags or using guidebooks in those systems.
  5. Compare the Difficulty Level (1–10) to get an intuitive sense of where the route sits overall.
  6. Cross-reference with the Climbing Calorie calculator to estimate session effort at the converted grade.

What each input means

Grade System
Select the grading system you are converting from: 0 = YDS, 1 = French, 2 = UIAA, 3 = British, 4 = V-Scale.
Grade Index (Difficulty Level)
Numeric difficulty index from 0 (easiest, ~5.4 YDS) to 16 (hardest, ~5.12c YDS). Each step maps to a specific grade in every system.

What each result means

Input System
The grading system you selected as input.
YDS Grade
Yosemite Decimal System grade, the standard in North America.
French Grade
French sport climbing grade, widely used in Europe.
UIAA Grade
International Mountaineering and Climbing Federation grade using Roman numerals.
British Grade
British adjectival and technical grade used in the UK.
V-Scale (Bouldering)
Hueco V-scale for bouldering, approximate equivalent at this difficulty level.

How this is calculated

Worked example, using the default values

  1. Identify Input Parameters
    Grade System = 0, Grade Index (Difficulty Level) = 6 = 2 input(s) provided
  2. Calculate YDS Grade
    5.10a = 5.10a
  3. Calculate French Grade
    6a = 6a
  4. Calculate Input System
    YDS = YDS
  5. Calculate UIAA Grade
    VI = VI

Engine last updated . Checked against 2 independently-derived tests — how we verify calculators.

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