Free running tools
Calculators for pacing, race planning and training, built around Spanish half marathons. Free, no sign-up, and nothing leaves your browser.
Pace calculatorTurn a goal time into pace per km and splits for 5K, 10K, half and marathon.Race time predictorPredict your half marathon or marathon time from a recent 5K or 10K.Time limit checkerEnter your goal time and see which Spanish half marathons you can finish within the cut-off.Fuelling planPick a race and goal time to see when you reach each aid station and when to take gels.Training zones calculatorHeart rate zones and easy, threshold and interval paces from your age and a race result.Track lane calculatorHow far is a lap in lane 4? Convert laps to distance on 400 m tracks.