Free Tool
TCC 5km Race
Prediction Teaser
Enter your Maximal Aerobic Speed. Get your predicted 5km time. Take it to Parkrun this Saturday and see how close the model gets.
MAS-based prediction
The only 5km race predictor anchored in Maximal Aerobic Speed — your actual aerobic ceiling, not a lookup table.
VDOT vs TCC side by side
See both predictions for your MAS value and understand why they differ — especially at longer durations.
Fitness categorisation
Find out where your aerobic fitness sits — from Novice through to Elite — based on your MAS.
Ready to try it?
Launch the 5km teaser
Opens in your browser — phone or desktop. Slide to your MAS value and get your predicted 5km time instantly. No sign-up. No credit card. Takes 10 seconds.
Open the 5km Teaser
Don't know your MAS? Run a field-based aerobic fitness test — time trial, beep test, YOYO IR1, Bronco etc — and use the TCC MAS Determination Spreadsheets to determine an accurate MAS value.
Want more than 5km?
The full Race Prediction Calculator
The 5km teaser is a sample of the TCC Race Prediction Calculator — the full tool gives you MAS-based predictions across 2km, 5km, 10km, 21.1km, and 42.2km, with VDOT comparison at every distance. Built for runners, team sport athletes, and coaches who want predictions grounded in physiology, not guesswork.
Learn More