Plan your race. Predict your time. Pick your goal.
A growing toolkit for runners and triathletes — no signup, no math, no fluff.
Convert pace, finish time and distance for any race from 5K to ultra. Includes split times and predicted race times.
Open the calculatorType a recent race result and we predict your finish time at every standard distance — 5K, 10K, half marathon, marathon and beyond.
Open the predictorCombine your 1km run pace with station times to predict your HYROX finish — Pro, Open, Men, Women.
Open the HYROX calculatorPredict your finish time at any triathlon distance from sprint to ironman, with swim, bike, run and transition splits.
Open the triathlon calculatorTurn treadmill speed and incline into min/mile, min/km and outdoor-flat-equivalent pace.
Open the treadmill calculatorPick a target finish time and split strategy. Get first/second-half splits and every-5K targets to print on your wrist.
Open the marathon plannerConvert a recent race result to your Daniels VDOT score and get easy/marathon/threshold/interval training paces.
Open VDOT calculatorCompute your 5 training zones from max HR and resting HR. Works for running, cycling and triathlon.
Open HR zones calculatorConvert hill-running pace to flat-equivalent effort. Built for trail runners and ultra athletes.
Open GAP calculatorEstimate your FTP from a 20-minute test and get all 7 Coggan power zones. The cycling-training gold standard.
Open FTP calculatorCompute your Critical Swim Speed from a 400m + 200m test and get 5 training pace zones. Built for pool swimmers and triathletes.
Open swim CSS calculatorConvert your race time to a WMA age-grade percentage. Compare your performance to world records adjusted for your age — built for masters runners.
Open age-grade calculatorBuild your per-hour carbs, fluid and sodium plan for any race duration, weight and climate. Get gel and bottle counts you can pack the night before.
Open fueling plannerPlug in power, weight, gradient, surface and aero position. Get predicted speed, W/kg and split times over 40K and 100K — pure cycling physics.
Open watts → speedType a target time, current weekly km and weeks to race. Get a personalized week-by-week table with long runs, quality sessions, cutbacks and a 3-week taper.
Open plan generatorNo max-HR test? Pick a formula (Tanaka, Fox/Haskell or Gulati for women), enter your age and get all 5 training zones in BPM.
Open estimated HR zonesPlug in distance covered in a 12-minute Cooper run and get VO₂max in ml/kg/min, your fitness rating and the percentile you sit in for your age.
Open VO₂max calculatorWeigh yourself before and after a workout and we compute fluid loss per hour, dehydration percent and a per-hour replacement target you can drink.
Open sweat rate calculator