Sport science calculators.
Formula-based tools covering training, nutrition, and performance testing. Nothing here is stored or sent anywhere, every calculation happens right in your browser.
Stopwatch
Time a run, a hold, or any open-ended set, with lap tracking for splits along the way.
Start → TrainingRep Counter
A simple digital clicker for your sets. Tap to count, no setup needed.
Start counting → TrainingRest Timer
Pick 30, 60, or 90 seconds and go. A simple countdown for resting between sets.
Start → TrainingTempo Trainer
A visual guide for lifting tempo, like 3/3/3/1. Set your phases and follow the moving marker through each rep.
Start → TrainingInterval Timer
Set your work and rest periods and rounds, then go. Useful for circuits, Tabata-style training, or any rounds-based workout.
Start timer → TrainingWorkout Quiz
Answer 3 quick questions about your sport, age, and goal to get a full mini workout, warm-up to cool-down.
Take the quiz → NutritionCalories & Macros
Get an estimate of your daily calorie needs, adjusted for your goal, with a protein, fat, and carb breakdown.
Calculate → TrainingHeart Rate Training Zones
Find your 5 personalised training zones in BPM, using the Karvonen method if you know your resting heart rate.
Calculate → EnduranceRace Time Predictor
Enter one recent race result and get predicted times for 5K, 10K, Half Marathon, and Marathon distances.
Predict my times → Strength1RM & RPE Calculator
Estimate your one-rep max from a recent working set, plus find your training weight from reps and RPE.
Calculate → EnduranceVO2 Max Calculator
See where your VO2 max ranks for your age and sex, from Low to Superior, using published exercise science norms.
Calculate →Want a full programme built around your own numbers, not just an estimate?
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