Use the 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.
- Free to use
- No signup
- Nothing to install
- Runs in your browser
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.Open the Race Time Predictor & Training Paces
Illustration. Open the tool for the real thing.
See it in action
Sample input: Hours = 0; Minutes = 25; Seconds = 0
What is the 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.
3 steps to your result
Open the tool and follow along. Nothing to install.
What you get
1 mile to marathon.
Fitness estimate.
Per km and per mile.
Copy the table.
AZRS tools are free to open and use.
It opens in your browser, so there is nothing to download.
Used for
Pick one to see how it fits.
How it compares
A plain look at this tool next to the usual alternative.
| This fitness tool | Desktop software | |
|---|---|---|
| Install | Nothing to install | Usually an app or program to install |
| Account | No signup | Depends on the product |
| Cost | Free to use | Free or paid, depends on the product |
| Where it runs | In your browser tab | On your computer |
Questions people ask
How accurate are predictions?
Good for similar distances; the further the target, the more your endurance training matters.
Is it free and private?
No charge and no signup. Pick your recent distance and time. Read predicted times. It all runs in the browser, with saved items kept on your device. Includes Race predictions; VDOT score.
Why is my marathon prediction slower than I hoped?
Marathon training needs long runs, which a short race time cannot show. The prediction assumes you have trained for the longer distance.
How do I use the Race Time Predictor & Training Paces?
1. Pick your recent distance and time. 2. Read predicted times. 3. Use the training paces.
Any tips for good results?
Use a recent, all-out effort. Use a race on a flat course in normal weather for the most useful prediction. Re-enter a new race result every few months so your paces keep up with your fitness.
More free tools
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Try the Race Time Predictor & Training Paces now
Predict 5K to marathon times and get easy, tempo and interval paces. Free to use.
Try it free