About Traxflows

Traxflows builds precise, free calculators for endurance athletes (runners, swimmers and cyclists) grounded in established exercise science (ACSM, Riegel, Daniels-Gilbert, Martin et al.), not guesswork.

Every calculator on this site uses the same validated formulas that coaches and sports scientists rely on, presented in a simple, ad-supported, sign-up-free interface. We also offer structured training plans for runners preparing for 5K to half marathon distances.