What Is the UIAA Grading System?
The UIAA grading system (from Union Internationale des Associations d'Alpinisme, the international mountaineering federation) uses Roman numerals to grade rock climbing routes from I to XII+. It is the standard system in Germany, Austria, Switzerland, Italy, the Czech Republic, Slovakia, Poland, and much of Eastern Europe.
The UIAA system has roots in the late 19th and early 20th century alpine tradition. It was designed to cover not just sport and trad climbing but the entire spectrum from easy walking terrain to extreme technical rock. The lower grades (I–III) describe scrambling and easy alpine terrain; technical climbing begins around IV–V.
From grade VI upward, modifiers are applied: a minus sign (–) for the easier half of the grade, no modifier for the middle, and a plus sign (+) for the harder half. So the sequence runs: VI–, VI, VI+, VII–, VII, VII+, and so on. This is the reverse of the Fontainebleau convention where + always means harder-within-grade and – is not used.
How It Differs from Other Systems
The main differences between UIAA and Fontainebleau/YDS:
- Roman numerals instead of Arabic numbers or decimals
- Both + and – modifiers used (Fontainebleau only uses +)
- Covers alpine terrain (grades I–III) not addressed by sport-focused systems
- Coarser at the top — fewer grade distinctions above XI than Fontainebleau offers in the 9a–9c range
- Historically calibrated on limestone crags in the Alps and Dolomites, which can feel different from granite or sandstone
Is UIAA Open-Ended?
Yes. When the system was first formalized, VI was considered the top of the scale. As climbing progressed, VII, VIII, IX, and beyond were added. Today XII+ corresponds to Font 9c — the hardest route ever climbed. If a route harder than 9c is ever established, a new UIAA grade would presumably follow.
Complete UIAA Grade Table
| UIAA | Fontainebleau | Yosemite (YDS) | Australian | Level |
|---|---|---|---|---|
| I | — | 5.0 | 1 | Scramble |
| II | 3 | 5.2 | 8 | Scramble |
| III | 4 | 5.4 | 10 | Beginner |
| IV | 5 | 5.5 | 12 | Beginner |
| V | 5+ | 5.7 | 14 | Beginner |
| V+ | 6a | 5.9 | 17 | Intermediate |
| VI– | 6a+ | 5.10a | 18 | Intermediate |
| VI | 6b | 5.10b | 19 | Intermediate |
| VI+ | 6b+/6c | 5.10c/d | 20–21 | Intermediate |
| VII– | 6c+ | 5.11a | 22 | Intermediate |
| VII | 7a | 5.11c | 23 | Advanced |
| VII+ | 7a+ | 5.11d | 24 | Advanced |
| VIII– | 7b | 5.12a | 26 | Advanced |
| VIII | 7b+ | 5.12b | 27 | Advanced |
| VIII+ | 7c | 5.12c | 28 | Advanced |
| IX– | 7c+ | 5.12d | 29 | Advanced |
| IX | 8a | 5.13a | 30 | Elite |
| IX+ | 8a+ | 5.13b | 31 | Elite |
| X– | 8b | 5.13c | 32 | Elite |
| X | 8b+ | 5.13d | 33 | Elite |
| X+ | 8c | 5.14a | 34 | Elite |
| XI– | 8c+ | 5.14b | 35 | Elite |
| XI | 9a | 5.14c | 36 | World class |
| XI+ | 9a+ | 5.14d | 37 | World class |
| XII– | 9b | 5.15a | 38 | World class |
| XII | 9b+ | 5.15b | 39 | World class |
| XII+ | 9c | 5.15d | 40 | World class |
History and Usage of UIAA Grades
The UIAA system evolved from the Welzenbach scale, created by German alpinist Willo Welzenbach in the 1920s. Welzenbach's scale ran from I to VI and was originally designed for the Alps, where the tradition of Roman numeral grading was deeply embedded. The UIAA adopted and standardized this system in 1968, extending the open-ended top as new routes pushed the limits.
The critical addition of + and – modifiers came in the 1970s and 80s, as sport climbing from France started influencing the wider European scene. Without more granular grades, German and Austrian route guides couldn't differentiate sufficiently between routes in the VII–IX range.
Regional Quirks
Even within UIAA territory, regional traditions vary. Some areas in Eastern Germany use the Saxon system (a different Roman numeral scale calibrated more conservatively, with its own IXc as the top grade). The Swiss sometimes add extra modifiers. Always check local guidebooks or ask local climbers about area-specific conventions.
UIAA vs Fontainebleau: Which Is Better?
Neither — they serve different traditions. Fontainebleau has become the de facto international standard for sport climbing because France dominated sport climbing's early years. UIAA remains dominant in alpine and trad contexts across Central and Eastern Europe. Most modern climbers who travel internationally learn to read both systems fluently, which is why a good grade converter is essential.
Convert UIAA Grades to Fontainebleau, YDS or Australian
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Open Grade Converter →Frequently Asked Questions
Why does UIAA use Roman numerals?
Roman numerals were standard in European scientific and technical literature in the early 20th century when the system was developed. They also make it visually clear that UIAA grades are distinct from other systems — a VII looks nothing like a 7a or 5.11c.
Is UIAA VII the same as Font 7a?
Yes, approximately. UIAA VII ≈ Font 7a ≈ 5.11c YDS. But "approximately" is the key word — these are consensus equivalences, not exact conversions. A route graded VII in the Dolomites might feel slightly different from a Font 7a in Ceuse due to rock type, style, and local grading traditions.
What's the difference between UIAA and the Saxon system?
The Saxon (Sächsische) system used in Saxony (eastern Germany) is a separate grading tradition that also uses Roman numerals but has a different calibration. Saxon IXc roughly corresponds to UIAA XI–XII. Routes in the Elbe Sandstone Mountains use Saxon grades exclusively. Don't confuse the two when planning trips to that area.
Which system should I learn if I'm a beginner?
Learn whichever system is used at your local climbing gym or crag. In North America, that's YDS. In France, Spain, or the UK, it's usually Fontainebleau. In Germany, Austria, or the Dolomites, UIAA. Once you know one system, converting to others is straightforward.