Running Calculators
Free running calculators: pace per mile/km, race finish time predictor, training heart rate zones, VO2 max, and weekly mileage tools.
Race Time Predictor
Predict your finish time for any race distance based on a recent race result. Uses the Riegel formula — the gold standard for running time prediction.
Running Pace Calculator
Calculate your running pace from distance and time. Convert between pace per kilometer, pace per mile, and speed in km/h or mph.
Running Training Zones Calculator
Calculate your 5 running training zones by pace or heart rate from your recent 5K time. Structure your training for optimal improvement and race readiness.