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Interactive Tool · Running & Endurance

Race Time Predictor

Predict your race finish time using the Riegel formula — based on a recent race result.

Home/Tools/Race Time Predictor
Your Recent Race
Target Race
Predicted Finish Time

Training Paces

Training Gear

Shop: Race Training Plans Shop: GPS Watches
Riegel Formula: T2 = T1 × (D2/D1)^1.06. Developed by Pete Riegel (1977). Accurate within ~2% for most runners.
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Recommended Gear

Race-Ready Essentials All links use our Amazon Associates tag — thank you for supporting TSP.

Nike Alphafly 3 — The fastest legal racing shoe available
~$285 Check Price on Amazon →
Program: Amazon Associates
Maurten 320 Drink Mix — Carb-loading protocol used by elite marathon runners
~$60/6-pack Check Price on Amazon →
Program: Amazon Associates
Nathan VaporAiress 2 Vest — Race-weight hydration — minimal bounce, 2L bladder
~$120 Check Price on Amazon →
Program: Amazon Associates
Garmin Forerunner 965 — Real-time race predictor, course maps, HRV tracking
~$600 Check Price on Amazon →
Program: Amazon Associates

Affiliate Disclosure: As an Amazon Associate we earn from qualifying purchases at no extra cost to you.