Free Training Calculators
Evidence-based tools to optimize your training. No registration required.
VO₂ Max Training Zones
Enter your VO₂ max value to calculate your 5 training zones (Zone 1-5) with heart rate and pace targets.
Calculator available on the Turkish version — English version coming soon.
Race Pace Predictor
Know your 10K time? Predict your half marathon and marathon finishing times using the Riegel formula.
Heart Rate Zones
Calculate your 5 heart rate training zones based on max heart rate (HRmax) or heart rate reserve (Karvonen method).
This topic is covered in depth in the THRESHOLD book.
THRESHOLD — On Fatigue, Endurance, and the Limits of the Body
540 pages · 22 chapters · 275 scientific references