Rock Climbing Grade Converter

Convert between all major roped and bouldering grade systems worldwide

Rock climbing grades are the universal language of the vertical world — and yet every country seems to speak a different dialect. Whether you're planning a sport climbing trip to France, comparing notes with a friend from Australia, or trying to make sense of a trad route graded in the British system, a grade converter is an essential tool in every climber's kit. Our Rock Climbing Grade Converter makes instant, accurate conversions between all major international grade systems for both roped climbing and bouldering, complete with difficulty band labels so you always know exactly how hard a route is relative to global climbing standards. The Yosemite Decimal System (YDS) is the dominant grading scale in North America, ranging from 5.0 (easy beginner routes) up to 5.15d (the current cutting edge of human possibility). The "5" prefix indicates fifth-class technical rock climbing requiring a rope; above 5.10, the scale subdivides into a, b, c, and d increments for finer precision. Most gym climbers in the US and Canada are familiar with YDS grades even if they don't know them by name — the tape on the gym walls almost always uses this system. The French sport climbing grade is the international lingua franca for bolted sport routes worldwide. Used across Europe, South America, Asia, and Australia, it runs from 1 through 9c and uses a combination of numbers, letters (a, b, c), and plus signs (6a+, 7b+) for subdivision. When you see a Céüse or Kalymnos trip report with grades like 7b or 8a, that's the French system. It's also the system used in official IFSC World Cup competitions, making it the closest thing climbing has to a universal standard. The UIAA grade (named for the Union Internationale des Associations d'Alpinisme) uses Roman numerals and is the traditional grading scale of Central Europe, particularly Germany, Switzerland, and Eastern Europe. It runs from I through XIII+ and features +/- increments for greater precision. UIAA grades are most commonly encountered in alpine and trad climbing contexts, especially for classic mountaineering routes where the system originated. The British trad grading system is famously unique: it uses two separate grades simultaneously. The adjectival grade (Moderate, Difficult, Very Difficult, Severe, Hard Severe, Very Severe, Hard Very Severe, then E1 through E11) rates the overall seriousness and commitment of the route, including factors like gear quality and fall consequences. The technical grade (3a through 9b) rates the difficulty of the single hardest move on the route. A route graded "E3 6b" therefore demands Hard Very Severe commitment with a 6b crux. This dual system captures what pure movement-difficulty scales cannot: the real-world danger and psychological challenge of a route. The Australian Ewbank system uses a single ascending integer, starting from 1 for the easiest scrambles and currently reaching into the upper 30s for world-class routes. Named after climbing pioneer John Ewbank, it's notable for its open-ended top (no maximum), its single clean number, and its use across Australia and New Zealand. The South African system is structurally similar to Ewbank and the two often share equivalent numbers at moderate grades. For bouldering, two systems dominate: the Hueco V-Scale (American) and Fontainebleau (Font, French). The V-Scale was developed at Hueco Tanks in Texas by legendary boulderer John Sherman, and runs from V-easy (beginners) through V17 (world record problems). Fontainebleau, developed in the famous sandstone forest south of Paris, runs from 3 through 9A and uses a similar letter/number/plus system to the French roped scale. Both systems are widely used in gyms and outdoor bouldering areas globally. Grades across all systems are inherently approximate and subjective. A route's grade reflects a community consensus formed over many ascents by different climbers with different body types, strengths, and styles — which means any conversion chart, including this one, represents a best-approximation rather than a precise mathematical equivalency. Use the difficulty band labels (Novice through Super Elite) alongside the specific grade conversions to get the clearest picture of where a route sits on the global scale of climbing difficulty.

Understanding Climbing Grade Systems

Formulas

Reference Tables

Worked Examples

How to Use the Rock Climbing Grade Converter

Frequently Asked Questions

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