Free sports tools
11 free tools — no signup needed
Calculate your running pace, speed, and split times
Predict race times based on recent performance
Calculate personalized training heart rate zones
Estimate your VO₂ max using Cooper, Rockport, beep test, or resting heart rate
Calculate calories burned running by weight, distance and intensity
Calculate MHR using Tanaka, 220−Age, Gellish, and Fox formulas
Convert min/km to km/h and back — with race finish times
Get your exact 5K and 10K finish times from pace or a known race time
Track weekly training load, ATL, CTL and TSB to avoid overtraining
Generate a week-by-week training plan for 5K or 10K races
Find out when to start training based on your race date and experience level
