With the recent gym explosion, many new climbers can spend years inside before taking their skills onto real rock. This transition can be a difficult one, especially when it comes to bouldering. It's nearly impossible to find a V0 outside with perfectly sculpted jugs neatly spaced every six inches up the problem. This can lead to frustration; most gyms don’t grade their problems to replicate outdoor climbs. They couldn’t and still be beginner-friendly. And who likes to climb in a sandbagged, ego-crushing pit of plastic? You’d never buy a membership.

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If you’re wondering how that green V5 at your local gym might compare to the V5 crimp-fest you’ve been researching on Mountain Project, consult the chart below.

Gym to Outdoor Bouldering Grade Conversion Chart

Illustation: Claire Eckstrom

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