Johnson Power Rankings
The world authority on 200+ mile ultramarathon running — weekly, data-driven, course-difficulty-adjusted.

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Marion Guillemant

Women · Americas · provisional rating

Ratings

Athlete ratings by board
BoardGenderRatingRankMove
ContinuousWomen968146• new
OverallWomen968146• new

Why this rank

The Overall rating is the time-decayed mean of this athlete’s best 2 in-window performance scores (highlighted below). Each score = base × difficulty × field-strength × quality.

Career results (200+ mile tier)

Cocodona 250 Mile Race · May 4, 2026 · 250mi continuouscounts toward rating
place 153 · 4d 15:02:19 · difficulty 2.45 · field 2.30 · quality 0.29
1,652
Tahoe 200 Mile Endurance Run · Jun 14, 2024 · 200mi continuouscounts toward rating
place 50 · 3d 10:29:31 · difficulty 2.35 · field 2.02 · quality 0.46
2,201