Understanding Climbing Grades: A Guide to the Different Grading Systems

One of the first questions I hear from new climbers is, “What do climbing grades actually mean?” Whether you’re at an indoor wall, clipping bolts on a sport route, or standing beneath a traditional line on a mountain crag, you’ll see grades everywhere.

Grading systems are designed to measure difficulty, but they’re far from universal. The system changes depending on where you are and what type of climbing you’re doing — and understanding these systems helps you choose routes that challenge you safely and realistically.

In this post, I’ll break down the main climbing grading systems used in the UK and internationally, explain what they represent, and offer advice on how to interpret grades as you develop your climbing.

Why Do We Use Climbing Grades?

Grades are a way to communicate the difficulty of a climb — a language climbers use to describe how hard, sustained, or committing a route feels. They help you make informed decisions, plan training, and track progress.

But grades are subjective. Conditions, height, reach, technique, and even weather can influence how difficult a climb feels. Grades should guide your choices, not define your ability. The most important thing is understanding what each grading system measures.

UK Traditional (Trad) Grading System

In the UK, traditional climbing uses a unique dual grading system that combines technical difficulty and overall seriousness.

• The adjectival grade reflects the overall challenge — including how sustained, exposed, or well-protected the route is. Examples: Moderate (M), Difficult (D), Very Difficult (VD), Severe (S), Hard Severe (HS), Very Severe (VS), Hard Very Severe (HVS), then E1, E2, E3... and so on.

• The technical grade describes the difficulty of the hardest single move or short sequence on the route. Examples: 4a, 4b, 4c, 5a, 5b, 5c, 6a...

  
  

Together, they give a more complete picture. For example:

• VS 4c — A challenging but well-protected climb with moderately difficult moves.

• VS 4a — Technically easier but more committing, possibly with fewer gear placements or sustained climbing.

  
  

It’s one of the most detailed systems in the world and helps UK climbers prepare mentally and physically for what’s ahead.

Sport Climbing Grades (French System)

Sport climbing, which relies on fixed bolts for protection, uses the French grading system — the most widely recognised internationally.

It runs from 1 (very easy) to 9b+ (elite level), and each number is broken down with a, b, or c sub-grades, plus optional “+” or “–” modifiers. Examples: 5a, 6b+, 7c, 8a...

These grades reflect the overall physical and technical difficulty of a climb — not its danger. Because bolts provide consistent protection, the French system focuses purely on how hard it is to reach the top.

If you’re sport climbing indoors or outdoors in the UK, this is the system you’ll encounter most often.

Bouldering Grades

Bouldering routes (often called “problems”) are much shorter but more intense, so they have their own grading systems. In the UK, you’ll see two main types:

Fontainebleau (Font) System

The Font system, developed in Fontainebleau, France, is the international standard. It uses numbers and letters, like the French sport system, but starts higher: Examples: 3, 4, 5+, 6A, 6B+, 7B, 8B...

Font grades measure the difficulty of the hardest sequence of moves, not endurance. It’s widely used in the UK for both indoor and outdoor bouldering.

V-Grade System

Popular in the US (and occasionally used in UK gyms), the V-scale starts at V0 and goes up indefinitely — V1, V2, V3...

Roughly, Font 6A+ ≈ V3, but the crossover isn’t perfect. Indoor walls sometimes list both systems to help climbers compare grades across styles and regions.

Indoor Wall Grading

Indoor gyms often use a simplified version of outdoor grading systems. Sport-style routes tend to follow the French system (5a–8a+), while boulder problems usually use Font or V grades.

Because setting styles vary between gyms, indoor grades are more about relative difficulty within that wall rather than an exact measure. A 6b at one gym might feel like a 6a or 6c elsewhere — so take them as a guideline, not gospel.

As I often tell climbers I coach: focus on progression, not the number.

Alpine and Winter Grades

If you venture into winter or alpine climbing, grades get even more complex. In the UK, winter routes use a dual system:

• Roman numerals (I–XII) for overall seriousness and commitment.

• Arabic numerals (3–9) for the hardest technical move.

Example: V,6 — a sustained, serious winter route with technical ice or mixed moves.

These grades take into account not only physical difficulty but also conditions, protection quality, and remoteness — things that play a major role in mountain safety.

Converting Between Systems

It’s common to need grade comparisons, especially when travelling or training indoors. Here’s a rough guide:

UK Tech	French (Sport)	Font (Boulder)	V-Grade
4c	5a–5b	4–4+	V0–V1
5a	5c–6a	5–5+	V1–V2
5b–5c	6a+–6b+	6a–6b	V2–V4
6a+	6c–7a	6b+–6c	V4–V6

Remember, grades are just subjective approximations — not exact science. The best way to learn how grades feel is to climb lots of routes across different areas and styles.

How to Use Grades Effectively

1. Use them as a guide, not a target. They help you find suitable routes but shouldn’t limit your confidence.

2. Climb across a range of grades. Working easier routes helps refine technique and build endurance.

3. Don’t obsess over the number. Conditions, style, and mental state can all make a route feel easier or harder.

4. Celebrate progress. Improvement often shows up as smoother movement or efficiency — not just higher grades.

As I tell clients during courses: grades are useful tools, but the real reward comes from how you climb, not what you climb.

Final Thoughts

Understanding climbing grades helps you choose routes that challenge you appropriately, plan your progression, and communicate clearly with partners. But remember — grades are only one part of the story. The experience, the learning, and the adventure matter far more than a number or letter in a guidebook.

Climb for the movement, the problem-solving, and the moments that make you feel alive. The grades will take care of themselves.