Methodology

VDOT calculator

Enter one race result. Get your VDOT fitness score, Easy / Marathon / Threshold / Interval / Repetition paces, and equivalent race times from 1500m to the marathon. Implements Daniels & Gilbert (1979).

Interactive · km/mi · Daniels' VDOT model

 Prediction

Race time predictor

Predict your time at every common distance from a single race result. Compares the Daniels VDOT model with Pete Riegel's empirical formula side-by-side, and explains when each one is right.

Interactive · km/mi · Daniels + Riegel

 Pace

Running pace calculator

Work out pace, finish time, or distance from any two of the three. Switch between min/km and min/mile, see your km/h and mph, and get an even-pace split table for the distance you're targeting.

Interactive · km/mi · pace, time, distance

 For fun

How do you compare to the pros?

Enter one race result and see where you'd be on the course when the world-record holder finishes. A humbling, screenshot-worthy reality check across 5K to marathon.

Interactive · km/mi · shareable

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