How board grades compare to the gym and outside

Sooner or later every board climber has the same moment of confusion. They cruise V5s on the board, walk over to the gym boulders and get shut down by a V5, then go outside and find a V5 on rock is a different beast again. Same number, three very different experiences. Here is why, and how to read across them without losing your mind.

Why the same number feels different

A grade is meant to describe difficulty, but difficulty depends entirely on context, and the three contexts could hardly be more different.

Board problems on a steep setting are concentrated and powerful. Short sequences, demanding holds, a fixed steep angle. They reward finger strength and pulling power, and they punish nothing else, because there is no slab, no reachy commercial volume, no real height. A board V5 is often a few very hard moves and little else.

Gym boulders are set by humans to be enjoyable and varied. A setter might dial a problem softer to suit the wall, throw in big friendly volumes, or build movement that flows rather than just pulls hard. Gym grades also drift between gyms and between setters, so two gyms can disagree by a full grade on what they call the same number.

Rock owes you nothing. Outdoor grades evolved over decades and tend to be conservative, built on bad feet, awkward bodies, conditions and the need to actually read the rock yourself. There is no setter making it flow and no colour telling you where to go.

The rough pecking order

There is no exact conversion, and anyone who gives you a tidy table is overselling it. But as a loose generalisation that most climbers recognise:

• Steep board grades tend to run stiff for their number, especially if you climb above the reference angle.
• Gym grades sit in the middle and vary a lot between gyms and setters.
• Outdoor grades are usually the most demanding for the number, because the rock and conditions add difficulty no plastic does.

So it is common to climb a grade or so harder on a board than you do outside, and to find gym grades somewhere in between. None of this means one is right and the others wrong. They are measuring different things.

What board climbing does and does not transfer

The board builds the engine. Finger strength, contact strength, body tension and the ability to pull hard on steep ground all carry over directly, and a strong board climber usually has the raw power to climb hard everywhere. That is real and worth having.

What the board does not build is the rest of climbing. Slab technique, smearing, reading a wall you have never seen, placing your own feet on rock, managing fear above a pad or a bolt, and the patience to work out beta with no LEDs to follow. Those only come from time on the gym wall and outside. A climber who only ever boards often arrives at the crag strong and clueless, which is a frustrating place to be.

How to read across the scales

The practical answer is to keep separate expectations and not let one scale wound your ego on another. Track your board grades against board grades, your gym ticks against the gym, and your outdoor sends against rock. Comparing across them tells you almost nothing useful and mostly just makes you feel bad.

If you want the board to help your outdoor climbing, point it at your weaknesses rather than your max grade. Use it to get strong, then spend the time on rock and on the varied gym wall to turn that strength into actual climbing ability. The number is just shorthand. What matters is that you are getting better at the thing in front of you.