Free tools
Free tools for triathletes and endurance athletes. No sign-up required.
Pace Converter
Convert between pace and speed units for swim, bike, and run.
Race Time Predictor
Predict marathon, half marathon, and 10K times from a recent race result.
Triathlon Split Calculator
Get target swim, bike, and run splits for Sprint to Ironman distances.
FTP Calculator
Estimate your Functional Threshold Power and cycling power zones.
Running Zone Calculator
Get VDOT training paces from a recent 5K, 10K, half, or marathon time.
Swim CSS Calculator
Calculate Critical Swim Speed and swim training zones from time trials.
TSS Calculator
Calculate Training Stress Score for cycling, running, and swimming.
Race Nutrition Planner
Calculate calorie, carb, hydration, and sodium needs for race day.
Sweat Rate Calculator
Measure fluid loss during exercise to dial in your hydration strategy.
Race Weight Calculator
Find your ideal racing weight for running, cycling, and triathlon.
Weekly Volume Planner
Generate a week-by-week triathlon training plan with automatic periodization.
Brick Workout Generator
Get bike-to-run brick workouts tailored to your race distance and fitness.
Race Day Checklist
Generate a printable triathlon gear and packing list for race day.