Free calculators and simulators for data-driven cycling training.
Calculate Functional Threshold Power from 20-minute test, ramp test or direct input. Training zones auto-generated.
Calculate FTP →Calculate your W/kg, find your cycling category, estimate climbing speeds and analyze weight goals.
Calculate W/kg →Calculate Training Load — with a power meter or by estimating intensity. Includes recovery guide.
Calculate Load →Simulate fitness build (Fitness) over weeks. Visualize training phases and season preparation with real numbers.
Simulate Fitness →Finish time, splits and fuel per segment — physics-based with aerodynamics, rolling resistance and Newton-Raphson.
Plan pacing →FTP, Fitness, Fatigue, Form from your Strava activities — updated daily, no manual calculation needed.
Start for free →Data is free — the daily decision isn't. WattRun builds a plan around your number, fits it to your real week and tells you what to do today — with a reason, not just charts.