Free tools — no signup needed
Get your exact 5K and 10K finish times from pace or a known race time
Calculate calories burned running by weight, distance and intensity
Calculate personalized training heart rate zones
Calculate MHR using Tanaka, 220−Age, Gellish, and Fox formulas
Convert min/km to km/h and back — with race finish times
Predict race times based on recent performance
Calculate your running pace, speed, and split times
Estimate your VO₂ max using Cooper, Rockport, beep test, or resting heart rate
