Free · No signup · No wearable required
Race Time Predictor
Predict your finish time from a recent race in seconds — and see the performance drivers behind the number.
Powered by PIRX’s proprietary machine-learning prediction engine — a multi-method ensemble that fits your individual endurance profile, not a single static formula.
Predict any distance
Enter any recent race — even a non-standard one like a 3.7 K time trial — then pick a preset or a custom target distance to project. Both the race you ran and the distance you want to predict accept any value in km, miles, or metres.
Your recent race
Free · instantEnter a race you’ve run recently. The closer it is in distance to your target, the tighter your supported range.
Format: MM:SS (e.g. 20:00) or H:MM:SS for longer races.
Or jump to a popular distance
Run a site or coach athletes?
Add this predictor to your own site — free, one snippet, no signup.
Embed on your site →Last updated: June 24, 2026