Calculators built on the same sports science we use in the lab: your training zones, race predictions for running and triathlon, race fuelling and VO2max. Free, and no sign-up needed to use them.
Start with your zones, then plan your race.
Your 7 training zones for heart rate, run pace, bike power and swim pace from one threshold test. Find my zones →
Marathon, half, 10K and 5K predictions adjusted for course hills and race-day weather, with a pacing plan. Predict my run →
Full and half distance predictions for every leg, with bike power, run pace and fuelling targets. Predict my triathlon →
Carbohydrate, fluid and sodium per hour for your race, from your finish time, weight and sweat rate. Plan my fuelling →
Estimate your VO2max from a recent race or a 12-minute run test, and see what it means. Estimate my VO2max →
Calculators estimate. A lab test measures your thresholds, VO2max and fuelling, so every number is yours. Book a lab test →
