Route Grade Converter
Convert climbing route grades between YDS, French, UIAA, British, and V-scale systems. Instantly translate difficulty ratings across international grading standards.
About this calculator
Climbing grades are informal consensus ratings, not physical measurements, and every country built its own scale before anyone tried to reconcile them. This calculator maps a single difficulty index (0-16, from 5.4 through roughly 5.12c on the Yosemite Decimal System) to its approximate equivalent on four other scales used around the world: French sport grades, UIAA, British trad grades, and the Hueco V-scale for bouldering. The Grade System selector only labels which scale you're reading from — the actual conversion always runs off the numeric Grade Index, so picking a different system does not change any of the five output grades, only which one is highlighted as your reference.
That matters most at the edges: British grades combine a technical grade with an adjectival risk rating that has no clean numeric equivalent, and V-scale is a bouldering scale being cross-walked onto roped-climbing difficulty, so treat any V-scale readout as a rough intuition check rather than a route-setting decision. Comfort on one scale doesn't transfer perfectly to another — regional grading culture, route style, and how sandbagged a given crag is all shift the real-world difficulty at a nominally 'equivalent' grade, so use this as a starting orientation when traveling or reading a foreign guidebook, then confirm on the rock.
Inputs
Results
YDS Grade
5.10a
French Grade
6a
How to Use This Calculator
- Select the grading system you are converting from: YDS (5.x), French (6a/7b), UIAA (VII), British, or V-scale for bouldering.
- Enter the grade value using the numeric selector — the scale maps each grade to a comparable difficulty level.
- Read all equivalent grades simultaneously in YDS, French, UIAA, British, and V-scale.
- Use the French or UIAA equivalent when traveling to European crags or using guidebooks in those systems.
- Use the Grade Index (0-16) as your single source of truth — a higher index always means a harder route across every scale shown.
- 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. Note: it labels the input only — every conversion is driven by the Grade Index below.
- 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
- Identify Input ParametersGrade System = 0, Grade Index (Difficulty Level) = 6 = 2 input(s) provided
- Calculate YDS Grade5.10a = 5.10a
- Calculate French Grade6a = 6a
- Calculate Input SystemYDS = YDS
- Calculate UIAA GradeVI = VI
Engine last updated . Checked against 2 independently-derived tests — how we verify calculators. Built by Paul Gunder, a software engineer, not a licensed financial, medical, or legal professional.
Frequently Asked Questions
Why doesn't changing the Grade System change the output grades?
The Grade System field only labels which scale the Grade Index number represents — it does not feed into the conversion math. All five equivalent grades are looked up directly from the Grade Index (0-16), so switching the label from YDS to French, for example, relabels your input but leaves every displayed conversion exactly the same.
How accurate is the YDS-to-French conversion?
It follows the widely used approximate equivalence tables climbers reference when guidebooks list foreign grades, but no cross-system table is exact. Route style, movement type, and regional grading conventions all shift where a climb actually sits, so treat the mapping as a reasonable starting estimate rather than a precise transformation.
Why is the V-scale conversion labeled approximate?
V-scale grades bouldering problems — short, powerful sequences without rope protection — while the other four scales grade roped, sustained routes. The two disciplines test different things, so mapping one onto the other is an intuition-level cross-reference at best, not a like-for-like difficulty match.
What does the British grade actually represent?
British trad grades pair two ratings: an adjectival grade (like HVS or E4) describing overall risk and commitment, and a technical grade (like 5a) describing the hardest single move. This calculator shows both together because neither number alone captures UK trad difficulty the way a single YDS or French number does.
Why might a route feel harder than its converted grade suggests?
Grading is subjective and regional — a crag known for sandbagging will consistently feel stiffer than its number suggests, and route style (crimpy vs. juggy, sustained vs. bouldery) affects perceived difficulty differently for different climbers. Use the conversion as an orientation point, then calibrate to the specific area's reputation.
Related Calculators
The questions that sit next to this one — chosen by subject, including calculators filed under a different category.
Rope Length Calculator
Calculate the minimum rope length needed for a climbing route based on wall height, anchor setback, knot allowance, and safety margin. Includes rappel length and recommended standard rope size.
Climbing & MountaineeringFall Factor Calculator
Calculate the fall factor from fall distance and rope paid out. Estimate impact force and severity rating to understand climbing fall dynamics.
Climbing & MountaineeringClimbing Calorie Calculator
Estimate calories burned while rock climbing based on body weight, session duration, route difficulty, and wall angle. Compare energy expenditure across difficulty levels.
More in Sports, Outdoors & Recreation.