Rock Climbing and Difficulty Grading:

In North America both sport and traditional rock climbs are graded using the YDS (Yosemite Decimal System). This climbing grade system starts at 5.0 (similar to climbing a steep ladder) and progresses in difficulty all the way up to 5.15 (a smooth overhanging cliff). The grade of a rock route is based on the crux, the most difficult move. Usually the first climber to complete a route assigns a grade which may then change as more people make the ascent.

Crux Calculator:

This project gives you the rough equivalent of any climbing grade in all of the major grading systems. This web app was designed and developed by Maxwell Lasky and is currently still in beta testing.

Crux Calculator utilizes the following technologies:


Please select which grade type you will be inputting: