Always useful if you’re a traveling climber, here are a few rock climbing grade comparison tables from a variety of sources:
ABC-of-Rock Climbing.com
Willerup.com
UK Climbing
It’s interesting to examine the wide variety of systems from different countries. In the US, the commonly known grading systems are YDS, UIAA, Australia, France, and the U.K. I was surprised to see systems for Poland, Belgium, Norway, Sweden, and East Germany as well.