Grade (climbing)

Many climbing routes have a grade that reflects the technical difficulty—and in some cases the risks and commitment level—of the route. The first ascensionist can suggest a grade, but it will be amended to reflect the consensus view of subsequent ascents. While many countries with a strong tradition of climbing developed grading systems, a small number of grading systems have become internationally dominant for each type of climbing, which has contributed to the standardization of grades worldwide. Over the years, grades have consistently risen in all forms of climbing, helped by improvements in climbing technique and equipment.

In free climbing (i.e. climbing rock routes with no aid), the most widely used grading systems are the French numerical or sport system (e.g. f7c+), the American YDS system (e.g. 5.13a), and latterly the UIAA scale (e.g. IX+). These systems are focused on technical difficulty, which is the sole focus in the relatively risk-free activity of sport climbing. The American system adds an R/X suffix to traditional climbing routes to reflect the risks of climbing protection. Notable traditional climbing systems include the British E-grade system (e.g. E4 6a).

In bouldering (i.e. rock climbing on short routes), the most widely used systems are the American V-scale (or "Hueco") system (e.g. V14), and the French "Font" system (e.g. 8C+). The Font system often attaches an "F" prefix to further distinguish it from French sport climbing grades, which itself uses an "f" prefix (e.g. F8C+ vs. f8c+). It is increasingly common for sport climbing rock routes to describe their hardest technical movements in terms of their boulder grade (e.g. an f7a sport climbing route being described as having a V6 crux).

In aid climbing (i.e. the opposite of free climbing), the most widely used system is the A-grade system (e.g. A3+), which was recalibrated in the 1990s as the "new wave" system from the legacy A-grade system. For "clean aid climbing" (i.e. aid climbing equipment is used but only where the equipment is temporary and not permanently hammered into the rock), the most common system is the C-system (e.g. C3+). Aid climbing grades take time to stabilize as successive repeats of aid climbing routes can materially reduce the grade.

In ice climbing, the most widely used grading system is the WI ("water ice") system (e.g. WI6) and the identical AI ("alpine ice") system (e.g. AI6). The related sport of mixed climbing (i.e. ice and dry-tool climbing) uses the M-grade system (e.g. M8), with other notable mixed grading systems including the Scottish Winter system (e.g. Grade VII). Pure dry-tooling routes (i.e. ice tools with no ice) use the D-grade prefix (e.g. D8 instead of M8).

In mountaineering and alpine climbing, the greater complexity of routes requires several grades to reflect the difficulties of the various rock, ice, and mixed climbing challenges. The International French Adjectival System (IFAS, e.g.TD+)–which is identical to the "UIAA Scale of Overall Difficulty" (e.g. I–VI)–is used to grade the "overall" risk and difficulty of mountain routes (with the gradient of the snow/ice fields) (e.g. the 1938 Heckmair Route on the Eiger is graded: ED2 (IFAS), VI− (UIAA), A0 (A-grade), WI4 (WI-grade), 60° slope). The related "commitment grade" systems include the notable American National Climbing Classification System (e.g. I–VI).