Course in the calculator
UTMB Mont-Blanc · 170K
Chamonix, FRA · 2026 edition · 171.5 km · +10,312 m · −10,312 m · measured at Low confidence
Try a target time on this course0 km · 1,040 mhigh point 2,535 m171.5 km
Pick a finish time and OTRI says what it would score, from the course and the time alone: the course is measured every 50 m and costed by gradient, and your speed over that flat-equivalent distance is compared with the fastest anyone has sustained over that much ground. How a score is made. This is a course for trying a target time, not a race page; results are never expected here.