Free Running Tools

Free calculators to analyze your running performance and plan your training.

VO2Max & Race Time Predictor

Estimate your VO2Max from a recent race, predict finish times for other distances, and get training pace zones.

Get your Easy, Marathon, Threshold, Interval, and Repetition training paces from a race result.

Convert your 10K time to a marathon prediction. Based on the Peter Riegel formula.

Calculate your 5 heart rate zones with %MaxHR and Karvonen methods.

Enter your weight and goal time to calculate gel count, intake timing, and hydration plan automatically.

Enter your goal time and pacing strategy to get a 5km split table. Print it and tape it to your wrist on race day!

We analyze your fitness, goals, and schedule to build a personalized training plan and race strategy.