Running Calculators
Quick tools for planning race efforts, workouts, and training targets.
Pace Calculator
Calculate pace per mile, pace per kilometer, and speed from distance and time.
Race Time Predictor
Use a recent result to estimate finish times for other race distances.
VO2 Max Calculator
Estimate running VO2 max and fitness band from a recent race result.
Marathon Split Calculator
Generate mile and kilometer checkpoints from a finish goal or target pace.
Heart Rate Zones
Estimate training zones from age, max heart rate, and resting heart rate.