Runwise
Running calculators. Fast. Clean. Built for runners.
Six free tools No login required Results in one click
Pace Calculator
Convert between min/km, min/mile, and km/h /pace Race Time Predictor
Predict your half or marathon from a recent race /race-predictor Training Paces
Get your easy, tempo, and interval paces /training-paces HR Zone Calculator
Find your 5 heart rate training zones /hr-zones VO2 Max Estimator
Estimate your aerobic fitness from a race time /vo2max Parkrun Predictor
Predict your 5K time from recent training /parkrun