Hi ,
It looks like you're using an ad blocker.

The revenue generated from the adverts on the site is a critical part of our funding - and it's because of these ads that I can offer the site for free. But using the site for free AND blocking the ads doesn't feel like a great thing to do, which is why this box is so large and inconvenient. Some sites will completely block your access, but I'm not doing that - I'm appealing to your good nature instead. Did you know that you can allow ads for specific sites, whilst still blocking them on others?

Ian Williams aka Fetch


Here's a handy bunch of tools to help you with your training. Got a suggestion for a tool?

Race Time Predictors

Race Times
Just done a race? Want to know what your equivalent time would be for a different distance?

Marathon Prediction
Most standard predictors (including the one above) predict marathon times that many of us struggle to achieve. This article offers a more accurate prediction, and advice on how to beat it.

VO2Max Estimation
Uses a recent race performance to calculate your VO2Max, and then generates equivalent race times.

Tanda Marathon Calculator
Calculate your marathon time based on your training volume and pace.

Riegel Calculator
Fine tune the predictions in your training log by recalculating your Riegel number.

Race Splits
Want to know your split times at each mile or km marker in the race?

Age Grading / WAVA

Calculate an age grade / WAVA score
Find out what WAVA score a given race performance would achieve.

Reverse Age-grading / WAVA
Enter an age grade and an age, to see what times you'd need to run.

Age-grading (WAVA) analysis
See your PB's in WAVA order, and the performances you'd need at various distances to match your best WAVA.

Training Tools

Heart Rate Zones
Uses your resting and max heart rates to calculate percentage zones for HRM training.

Training Pace
Enter a race time, and find out how fast to run in training.


Find out what time of day the person you're cheering for is due to come past your face.

Your BMI
Want to calculate your BMI? Our BMI calculator does what it says.

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