Calculators
Free tools for triathlon, duathlon and running. Everything runs in your browser, with no sign-up.
The planner
Race-day planner
Pacing for your real course: terrain-adjusted splits from your GPX files, notes for every climb, a fuelling plan and a printable race card.
- 1 Race & courses Pick your race and drop in the bike and run GPX files.
- 2 Goals & pacing Set a goal time and how you want to pace each leg.
- 3 Your plan Splits for every climb, what to eat when, and a race card.
Calculators & tools
- Run Pace converter Pace ↔ speed ↔ finish time, per km or mile, with times for common race distances.
- Any sport Race time predictor Predict your time over other distances from one recent run, swim or ride.
- Swim Critical swim speed (CSS) Your threshold swim pace and training paces from a 400 m + 200 m test.
- Bike Bike power ↔ speed What speed your watts give, or what watts a speed needs, on the flat or a climb.
- Training Heart rate zones Training zones from max and resting heart rate, or from a threshold test, for run and bike.
- Fuelling Sweat rate & fuelling Your sweat rate from a weigh-in, plus fluid and carbohydrate per hour for your race.
- Fuelling Carb loading How much carbohydrate to eat in the days before your race and at race breakfast.
- Race day Race-day checklist A packing list that fits your race, swim, transition setup and the weather. Tick off and print.