Free tools
Free calculators for endurance athletes.
Quick, accurate tools for pacing and training. No sign-up, no email. When you're ready to turn a target into a real plan, Gritup builds one around your week.
Pace calculator
Turn any distance and finish time into pace per km and mile, speed, and a full split table.
Open toolTraining pace calculator
From a recent race, get your easy, marathon, threshold, interval, and rep paces, using the Daniels VDOT method.
Open toolRace time predictor
Predict your 5K, 10K, half, or marathon time from a result at another distance.
Open toolHeart rate zone calculator
Find your five training zones from your max or resting heart rate, so easy days stay easy.
Open toolSteps to miles calculator
Convert any step count to miles and kilometres, for walking or running, tuned to your stride.
Open toolDistance converter
Kilometres to miles and back, with one-tap presets for 5K, 10K, half, and marathon.
Open toolCalories burned running
Estimate the calories you burn on a run from your weight and distance, per mile and per km.
Open toolBeyond the calculator
Numbers are a start. A plan is the finish.
Gritup turns your paces and zones into a periodised, week-by-week plan that adapts to your life, for running, cycling, swimming, and triathlon.