9a+ to V Scale: Complete Guide to Bouldering Grade Conversion
Contents
- Key Takeaways
- Understanding 9a+ to V Scale Conversion
- What Is the 9a+ Grade?
- How the V Scale Works
- Direct Comparison: 9a+ and V Scale Equivalents
- Bouldering Grading Systems and Their Context
- Origins of the V Scale and Font Scale
- Bouldering Grades Around the World
- Role of Route Setters and Consensus
- Conclusion
- Sources
When climbers talk about grades like 9a+, they’re describing some of the most difficult sport routes in the world. These grades measure the physical and technical challenge of a climb, but they can be hard to compare across styles. Bouldering, for example, uses the V scale, which focuses on short, powerful sequences rather than long endurance climbs.
A 9a+ route on the French sport scale is roughly 5.15a on the YDS, and it has no exact match on the bouldering V scale. Routes at this level often contain crux sequences that climb like very hard boulder problems. If you mean a Font 9A+ boulder, that would be about V18, a grade first proposed in 2025.
Understanding how these grading systems align gives climbers a clearer picture of what each grade means in practice. It connects two parts of the climbing world that often feel separate and helps build realistic expectations for performance and training goals.
Key Takeaways
- A French sport 9a+ is about 5.15a. It has no exact V equivalent, though a Font 9A+ boulder would be about V18.
- Each grading system measures difficulty differently based on route style.
- Comparing scales helps climbers gauge skill and progress across disciplines.
Understanding 9a+ to V Scale Conversion
Climbers use different grading systems to measure route difficulty. The 9a+ grade on the French sport scale and the top of the V scale for bouldering both describe elite-level climbs, but they apply to different climbing styles and problem lengths.
What Is the 9a+ Grade?
The 9a+ grade is from the French sport-climbing scale. It measures the difficulty of long, roped routes that demand endurance, strength, and precise technique. This grade represents one of the hardest levels in sport climbing, just below 9b and well above 8c.
A 9a+ route usually includes sustained overhangs, small holds, and complex sequences. Climbers who complete these routes often train for years to build the required power and efficiency.
The French system is open-ended, meaning grades can increase as harder climbs are established. For context, 9a+ roughly equals 5.15a on the Yosemite Decimal System used in North America, according to the UIAA’s grade comparison table. It marks a level reached by only a small number of professional climbers worldwide.
How the V Scale Works
The V scale (or Hueco scale) is the main system used for bouldering grades in North America. It starts at V0 for beginner problems and extends to V17 for the hardest confirmed boulder problems. In 2025, Elias Iagnemma proposed the first V18, Exodia.
Each step up the scale reflects a noticeable increase in difficulty. The scale focuses on short, powerful sequences rather than endurance. Because bouldering routes are shorter, the grading emphasizes single, intense moves or short combinations.
The V scale is open-ended like the French system. As new climbs push physical limits, higher grades appear. This allows climbers to compare boulder problems across gyms and outdoor areas using a consistent reference.
Direct Comparison: 9a+ and V Scale Equivalents
Comparing 9a+ to the V scale involves estimation because sport climbing and bouldering test different skills. Standard charts convert French sport grades to the YDS, not to V grades.
| French Grade | YDS | Context |
|---|---|---|
| 9a | 5.14d | Action Directe (1991) is a contender for the first 9a |
| 9a+ | 5.15a | Elite-level difficulty |
| 9b | 5.15b | Near world-class limit |
| 9c | 5.15d | Silence (2017) was the first route proposed at this grade |
These conversions help climbers understand how sustained route difficulty compares to short boulder intensity. While not exact, they offer a useful reference when discussing performance across climbing disciplines.
Bouldering Grading Systems and Their Context
Climbers use grading systems to measure the difficulty of bouldering problems and sport climbing routes. These systems, created in different regions, help compare climbs and track progress even when styles and rock types vary.
Origins of the V Scale and Font Scale
The V Scale began at Hueco Tanks State Historic Site in Texas in the late 1980s. John Sherman developed it to classify the difficulty of bouldering problems there. The scale starts at V0 for easy climbs and increases without limit as problems become harder.
The Fontainebleau (Font) Scale originated in the Fontainebleau Forest near Paris, France. It uses grades such as 5A, 6C, or 8B+, combining numbers and letters to show fine differences in difficulty.
While both scales measure similar physical and technical challenges, they arose from different climbing cultures. The V Scale focuses on power and movement, while the Font Scale reflects the technical precision and style of European bouldering.
| Scale | Origin | Example Grades | Typical Use |
|---|---|---|---|
| V Scale | Hueco Tanks, USA | V0–V17 | North America |
| Font Scale | Fontainebleau, France | 3–9A | Europe and international |
Bouldering Grades Around the World
Climbing regions often use different grading systems. The V Scale dominates in North America, while the Font Scale is common across Europe. Japan, Australia, and South Africa also adopt one of these systems or create local variations.
For sport climbing, the French scale (e.g., 6a–9c) is standard, while the Yosemite Decimal System (YDS) is used mainly in the United States for roped climbs. Each system attempts to describe physical effort, technical moves, and mental challenge, though direct conversions are never exact.
Because rock type and style vary, granite slabs, sandstone roofs, limestone walls, grades reflect local standards. A V5 at Hueco Tanks may feel different from a V5 in Switzerland or Japan.
Many climbers refer to an educational breakdown of climbing-grade difficulty from authoritative organizations to better understand how different grading systems compare across climbing styles.
Role of Route Setters and Consensus
A route setter assigns an initial grade based on personal assessment of difficulty. In climbing gyms, setters often test climbs with others to refine the grade before public release. Outdoor problems rely on the first ascensionist’s suggested grade, which later climbers may confirm or adjust.
Consensus develops through repeated ascents and community feedback. Over time, grades stabilize as climbers compare experiences and styles.
This process helps maintain fairness and consistency across gyms and outdoor areas. It also reflects how climbing grades evolve with improvements in training, technique, and understanding of movement.
Conclusion
The 9a+ grade on the French sport climbing scale represents an extremely advanced level of difficulty. It equals roughly 5.15a on the YDS. It has no exact match on the V scale used in bouldering, because route and boulder grades measure different things.
Because the V scale measures short, powerful problems and the French scale measures longer, sustained climbs, direct conversion is not exact. Still, climbers use these comparisons to understand the physical and technical demands across styles.
| French Grade | YDS | Description |
|---|---|---|
| 9a | 5.14d | Elite difficulty |
| 9a+ | 5.15a | Near the top of current standards |
| 9b | 5.15b | Among the hardest known climbs |
Climbers often rely on both scales when training for specific goals. Knowing that a 9a+ route combines boulder-level crux moves with sustained endurance helps set expectations for strength, endurance, and technique.
These grading systems continue to evolve as new climbs push the limits of performance. Accurate comparisons between 9a+ and V-scale grades help maintain consistency and understanding within the climbing community.
