Tools
Calculators for athletes
Running pace, marathon times, heart rate zones, swimming, cycling, one-rep max and triathlon. Free, instant and no sign-up.
Running pace
Calculate your running pace per km and per mile, your speed and your splits for a 5K, 10K, half marathon or marathon. Free, instant results.
Open 5K, 10K, half and full marathonRace time predictor
Predict your marathon, half marathon, 10K and 5K finish times from a recent race result, with the target pace per kilometer for each distance.
Open Your 5 heart rate zonesHeart rate zones
Calculate your 5 heart rate training zones in BPM from your age or max heart rate, using the Karvonen method if you know your resting heart rate.
Open Pace per 100 m and critical swim speedSwim pace and CSS
Calculate your swim pace per 100 meters and your critical swim speed (CSS) from a 400 m and 200 m test, plus your personal swim training zones.
Open Zones in watts and W/kgFTP and power zones
Calculate your FTP from a 20-minute test and your 7 Coggan power zones in watts, plus your watts per kilogram (W/kg). Free cycling calculator.
Open km/h and ride timeAverage bike speed
Calculate your average cycling speed from distance and time, or how long a ride will take you at a given speed. Free bike speed calculator in km/h.
Open Your max and percentage chart1RM (one-rep max)
Calculate your one-rep max for squat, bench press or deadlift without maxing out, using the Epley and Brzycki formulas, plus a percentage chart.
Open Sprint, Olympic, 70.3 and IronmanTriathlon time
Estimate your finish time for a sprint, Olympic, half Ironman (70.3) or full Ironman triathlon from your swim, bike and run paces, transitions included.
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