Obstacle Race Training Calculator

Obstacle course racing demands two separate fitness qualities that most runners under-train for grip and upper-body endurance, so this calculator scores your readiness across both dimensions rather than treating it as a pure running plan. Your target weekly mileage is set at 1.5x race distance, and your current weekly volume is estimated by tripling your longest comfortable single run — the gap between those two numbers, divided by your remaining weeks (minus a 2-week taper at the end), gives a recommended weekly mileage increase. For grip and upper-body readiness, the calculator sets a pull-up benchmark of roughly one pull-up for every two obstacles on the course — a rough proxy for the fact that OCR courses lean heavily on grip-dependent obstacles like rope climbs, monkey bars, and rig traverses — and compares that target against your current max pull-up set to compute a strength gap percentage. Your training days get split roughly 50% running, 30% strength work, and the remainder to obstacle-specific practice (crawling, climbing, carrying), apportioned by largest remainder so the three session counts always add up to exactly the number of days you said you have.

On a 1- or 2-day week that split leaves no separate obstacle day at all and the calculator reports 0 — the honest answer being to fold obstacle-specific work into your strength sessions rather than pretend a fourth priority fits. The overall readiness score weights running-distance progress at 40%, strength progress at 35%, and remaining prep time at 25%, capped at 100. The estimated obstacle fail rate is a simple heuristic comparing your pull-up capacity against the obstacle count — it's meant to highlight whether grip strength is your limiting factor, not a literal prediction of which obstacles you'll fail. Since these figures don't know your specific race's obstacle mix (a rope-heavy Spartan Beast differs from a crawl-heavy Tough Mudder), treat the strength targets as a floor to train toward, not a guarantee of clearing every obstacle.