About Traxflows

Traxflows brings together free calculators and training plans for runners, swimmers and cyclists. The idea is simple: clear, fast, reliable tools, with no sign-ups and no clutter, to help you train with method.

What we're built on

The calculators don't use made-up numbers. They rest on recognised formulas from exercise physiology and sports science — the ACSM metabolic equation for treadmill/road conversion, the Riegel formula for race prediction, the Daniels-Gilbert VDOT method for training paces, and the Martin model for cycling power and speed. Every page explains how the calculation is done, so you always know where the result comes from.

Who's behind it

Traxflows is built by an endurance coach, with the same standard applied to coaching athletes: train with structure, progress with clarity. The training plans sold on the site come from that work.

How we're funded

The site is free and supported by advertising and the sale of training plans. That keeps the tools open to everyone, with no barriers.

Get in touch

Have a suggestion, found a bug, or want to know more? See the Contact page.