Running calculators
Seven tools that cover the questions runners ask most. Every one shows its formula and its limits.
Pace calculator
Pace, time or distance from the other two.
Open calculatorRace time predictor
One race in, predicted times from the mile to the marathon.
Open calculatorTraining paces
Easy, marathon, threshold and interval paces from a recent race.
Open calculatorHeart rate zones
Five zones from your max heart rate, using the Norwegian model.
Open calculatorSplit calculator
Even or negative splits for any goal time.
Open calculatorTreadmill pace
Speed and incline converted to outdoor pace.
Open calculatorHeat adjustment
How much to slow down in heat and humidity.
Open calculator