Race Time Predictor & Training Paces
Predict 5K to marathon times and get easy, tempo and interval paces · free, no signup
See Race Time Predictor & Training Paces in action
Race Time Predictor & Training Paces
Enter a recent race (1 mile to marathon) and see predicted times for other distances using the Riegel formula, plus your VDOT fitness score and five training paces (easy, marathon, threshold, interval, repetition) by Jack Daniels's model, per km and per mile.
Use it to set realistic goals and run the right pace on every training day.
Key features
Race predictions
1 mile to marathon.
VDOT score
Fitness estimate.
Training paces
Per km and per mile.
Printable
Copy the table.
How to use it
- Pick your recent distance and time.
- Read predicted times.
- Use the training paces.
Worked example
Example
A 25:00 5K gives a 10K of about 52:10, a half marathon of about 1:55 and training paces of 6:20 /km easy.
Who uses this tool
Runners
Pace every session.
Tips for the best results
- Use a recent, all-out effort.
Common mistakes to avoid
- Predicting a marathon from a 5K without long-run training.
Why use AZRS QuickFix?
It is 100% free, needs no signup and has no watermark or usage limits. The tool runs in your browser, so what you type stays on your device, and it works on phones, tablets and desktops. New tools are added every week — bookmark this page or browse the full QuickFix toolbox.
Frequently asked questions
How accurate are predictions?
Good for similar distances; the further the target, the more your endurance training matters.
Is it free and private?
Yes. It is free with no signup. Everything runs in your browser and anything saved stays on your own device.