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

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Sam Karthan

Men · Americas

Ratings

Athlete ratings by board
BoardGenderRatingRankMove
ContinuousMen2,45940• new
OverallMen2,45940• new

Why this rank

The Overall rating is the time-decayed mean of this athlete’s best 3 in-window performance scores (highlighted below). Each score = base × difficulty × field-strength × quality.

Career results (200+ mile tier)

The Mammoth 200 · Sep 26, 2025 · 208mi continuouscounts toward rating
place 14 · 2d 20:13:37 · difficulty 1.01 · field 2.07 · quality 0.48
1,003
Bigfoot 200 Endurance Run · Aug 8, 2025 · 200mi continuouscounts toward rating
place 12 · 2d 11:58:54 · difficulty 2.65 · field 2.50 · quality 0.60
3,960
Tahoe 200 Mile Endurance Run · Jun 13, 2025 · 200mi continuouscounts toward rating
place 48 · 3d 10:49:28 · difficulty 2.35 · field 2.32 · quality 0.44
2,416