Rock-climbing grades
The rating of climb is a subjective indication of the technical difficulty of the route.
All rating systems use the difficulty of the crux (the most difficult move or series of moves) to determine the rating. Here I present four most popular grade systems.
| UIAA | Polish | French | American |
| VI | VI | 6a | 5.10a |
| VI+ | VI+ | 6a+ | 5.10b |
| VII- | VI.1 | 6b | 5.10c |
| VII | VI.1+ | 6b+ | 5.11a |
| VII+ | VI.2 | 6c | 5.11b |
| VIII- | VI.2+ | 6c+ | 5.11c |
| VIII | VI.3 | 7a | 5.11d |
| VIII+ | VI.3+ | 7a+ | 5.12a |
| IX- | VI.4 | 7b | 5.12b |
| 7b+ | 5.12c | ||
| IX | VI.4+ | ||
7c | 5.12d | ||
| IX+ | VI.5 | ||
| 7c+ | 5.13a | ||
| X- | VI.5+ | 8a | 5.13b |
| X | VI.6 | 8a+ | 5.13c |
| 8b | 5.13d | ||
| X+ | VI.6+ | ||
| 8b+ | 5.14a | ||
| XI- | VI.7 | 8c | 5.14b |
| XI | VI.7+ | 8c+ | 5.14c |
| XI+ | VI.8 | 9a | 5.14d |