Climbing Grade Converter
Introduction: How to Use This Climbing Grade Converter
This tool lets you enter a climbing grade in the system you know best and see approximate equivalents in other major grading systems. It is designed for trip planning, reading foreign guidebooks, or comparing bouldering and route grades across regions.
- Select your source climbing system from the dropdown (for example, V-scale, YDS, French, UK, UIAA, or Australian).
- Type the grade you want to convert exactly as you would write it in a guidebook (for example,
V4,5.11b,6b+,E2 5b,VIII-, or22). - Run the conversion to see approximate equivalent grades in the other systems.
The output gives you a practical sense of how hard a climb is relative to what you already know. It is most useful for:
- Planning trips to areas that use a different grading system.
- Comparing grades between guidebooks written in different systems.
- Getting a rough feel for where your current limit falls in another system.
Conceptual Relationship Between Grade Systems
Although each grading system has its own history and style, they all try to express the same underlying idea: how physically, technically, and mentally difficult a climb is. A simple way to think about this is to break the challenge into three components:
Formula: R = M + E + P
where:
- R is the overall perceived route difficulty,
- M is the hardest individual moves or boulder problem,
- E is the endurance or pump factor over the length of the climb, and
- P is the psychological and protection factor (exposure, runouts, fall consequences).
Different systems weight these factors differently:
- V-scale (bouldering) is dominated by M (hardest moves) with relatively little weight on endurance or protection.
- Yosemite Decimal System (YDS) blends M and E, with only a rough, indirect nod to protection.
- French sport grades focus on overall sustained difficulty (M + E) for bolted routes.
- UK traditional grades try to separate M and P by combining an adjectival grade (overall seriousness) with a technical grade.
- UIAA and Australian grades sit conceptually between YDS and French systems, with their own regional traditions.
Worked Example: Converting a Familiar Grade
Suppose you climb comfortably around French 6b+ at your local sport crag and you are planning a trip to the United States. You want to know which YDS and V-scale grades will feel similar.
- Choose French Sport Grades as the source system.
- Enter
6b+as the source grade. - Run the conversion.
A typical cross-system chart will place French 6b+ roughly around:
- YDS: about 5.10d, sometimes up to 5.11a depending on the route style,
- V-scale: a sustained equivalent near V2, though the single hardest move can feel closer to V3–V4,
- UIAA: approximately VII,
- Australian: around 20.
If you normally onsight many 6b+ routes, you might expect to feel similarly comfortable on well-protected 5.10d and easy 5.11a sport routes in the US. The single hardest move on such a route can still feel like a V3 or V4 boulder problem, which is why crux move grades often sit above a route’s overall equivalent.
Typical Cross-System Grade Comparison
The exact mapping between systems is not universal, but the table below shows commonly accepted approximate equivalences around intermediate difficulty. Your converter uses a more detailed internal table than this simplified example, but the relationships are similar.
| V-Scale (Bouldering) | YDS (Sport/Trad) | French Sport | UK Tech / Adjectival | UIAA | Australian |
|---|---|---|---|---|---|
| V1 | 5.10b–5.10c | 6a+–6b | E1–E2 5b | VI+–VII- | 19–20 |
| V2 | 5.10d–5.11a | 6b+–6c | E2–E3 5c | VII–VII+ | 20–21 |
| V3 | 5.11b–5.11c | 6c+–7a | E3–E4 6a | VIII-–VIII | 22–23 |
| V4 | 5.11d–5.12a | 7a+–7b | E4–E5 6a | VIII+–IX- | 23–24 |
| V5 | 5.12b–5.12c | 7b+–7c | E5–E6 6b | IX–IX+ | 25–26 |
Use these ranges as a ballpark reference, not as strict rules. Individual routes can feel easier or harder than their nominal grade, especially when they favor or punish your personal strengths.
Interpreting your climbing-grade results
When you convert a grade, the output is an approximation of where that climb would sit in other systems if climbers in that region had graded it. Expect small disagreements between guidebooks, online databases, and local climbers. That is normal and reflects the subjective nature of grading.
A few practical tips:
- Treat the converted grade as a starting point when choosing climbs, then adjust up or down based on how stiff or soft you find the area.
- For bouldering vs. route comparisons, remember that a V-grade mainly describes the hardest move, while a route grade also includes how long and pumpy the climb is.
- On traditional climbs, the adjectival component in the UK system or reputation of a route ("serious", "bold") might matter more than its nominal difficulty when you decide whether it is appropriate.
Limitations and assumptions of grade conversion
Climbing grades are notoriously subjective. Two climbers of different heights, styles, and strengths can have very different experiences on the same line. Any converter must therefore make simplifying assumptions. This calculator assumes the following:
- Average conditions. Grades are calibrated for typical dry rock and standard conditions, not unusual heat, humidity, or polish.
- Modern consensus. Old sandbagged routes or newly upgraded climbs may sit outside the ranges used here.
- Rounded difficulty. The tool rounds to the nearest commonly used grade rather than outputting fractional or in-between values.
- Route style neutrality. It does not explicitly distinguish between slabs, overhangs, crack climbs, or endurance pitches, even though these style differences can strongly affect your personal perception of difficulty.
- Trad vs. sport simplification. For UK, YDS, and Australian grades, the psychological and protection aspects are not modeled separately in the numerical conversion.
Because of these limitations, you should not use the output as a safety guarantee. Always back off or down-climb if something feels harder or more serious than the converted grade led you to expect.
About These Grade Conversions
The equivalences used in this calculator are based on widely circulated comparison charts from guidebooks, climbing magazines, and community consensus, along with the kinds of tables that appear in many climbing gyms. There is no single official conversion endorsed by all organizations, so every chart, including this one, represents an informed best effort.
When multiple reputable sources disagreed on specific crossover points, the mapping tends to follow the middle of the common range rather than the most aggressive or soft interpretation. The goal is a tool that feels reasonable to most climbers most of the time, not to settle grading debates.
When Conversions Are Most and Least Reliable
Conversions tend to be most reliable when:
- You are comparing modern sport crags between regions where grades have been updated and consensus is strong.
- You have a decent sample of routes at a given grade and can mentally average your experience.
- The routes are of similar style (for example, vertical face climbing on well-bolted limestone in two different countries).
They tend to be least reliable when:
- You are looking at single famous sandbags or historically undergraded areas.
- The comparison spans very different styles, such as short, powerful boulders versus long pumpy pitches.
- You are near the limits of current difficulty (cutting-edge grades), where consensus is still evolving and climbers are few.
- Protection quality or fall consequences dominate the experience, as on bold traditional lines.
Use the converter as one of several tools: combine it with local advice, guidebook descriptions, and your own judgment when choosing what to try.
How the converter maps grades
There is no arithmetic formula for grade conversion, because each system is an ordered list of named difficulty bands rather than a number line. This converter stores a single master table in which every row is one difficulty band and each column is the equivalent grade in each system. To convert, it finds the band whose entry matches your source grade, then reads the other systems from the same row, which keeps the systems aligned by real-world difficulty instead of by position in a list.
Climbing grade conversion questions answered
How accurate are climbing grade conversions?
They are approximate. Each system was developed independently for different rock, styles, and eras, so equivalents drift by roughly a grade in either direction. The conversions here follow standard comparison charts and align systems by difficulty band, but always cross-check with a local guidebook and climbers who know the area.
Why can a V-scale grade not map cleanly to a route grade?
Bouldering V-grades measure the difficulty of the hardest few moves, while route grades such as YDS, French, and UIAA blend hardest moves with length, sustained pumpiness, and how strenuous the whole pitch is. A short powerful boulder and a long pumpy pitch can share a nominal equivalent yet feel completely different, so treat boulder-to-route equivalents as the loosest of all.
What is the difference between UK technical and adjectival grades?
The UK uses two grades together. The adjectival grade (Diff, VS, HVS, E1, E2, and so on) describes the overall seriousness, including how sustained and how well protected the route is, while the technical grade (4c, 5a, 6a) describes the hardest single move. A bold, poorly protected route can carry a high adjectival grade with a modest technical grade.
Which grade should I trust when they disagree?
Trust the local guidebook and recent consensus for the specific crag, then use this converter to translate that into a system you know. Grades also drift over time and vary by rock type and wall angle, so use the conversion as a planning starting point rather than a promise of how a route will feel.
Sources: The cross-system alignment follows the widely used climbing grade comparison charts summarized in the grade (climbing) comparison tables and published conversion charts from guidebook publishers. Equivalents are approximate and vary by region, rock type, and route style.
Arcade Mini-Game: Climbing Grade Converter Calibration Run
Use this quick arcade run to practice separating useful scenario inputs from common planning mistakes before you rely on the calculator output.
Start the game, then use your pointer or arrow keys to catch useful inputs and avoid bad assumptions.
Enter a climbing grade to see equivalent difficulties across all rating systems.