Hi ,
It looks like you're using an ad blocker. I understand. No-one likes ads.

But our site costs money to operate, and I need to eat.

Please consider enabling ads for our website, or making a voluntary donation. If you donate, I can turn off the ads for you for a period of time. Average donations are about £3.50 per month, so a tenner would give you three months ad free.

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Ian Williams aka Fetch
Want help calculating training paces, race predictions and age gradings? More calculators here

Training Calculator - Predict Your Marathon Time

In 1977, Pete Riegel devised a formula for predicting race times, based on your existing performances. The basic formula is t2 = t1 * (d2 / d1)1.06, but the "1.06" can be improved upon.

Specifically, when converting from half marathon to full marathon, it often provides what feels like an unobtainable time. From an analysis of over a thousand runners, we found that it was more than 5% out for two thirds of runners. We have produced a calculator that will give you a more realistic calculation - and it takes your gender into account. In our sample data, it got within 5% for three quarters of our sample.

If you like our calculator, please share it with your friends:
Enter your half marathon time here:

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Fetcheveryone is a free website for runners, cyclists, and swimmers. We offer a training log with detailed analysis, none of it hidden behind a paywall - we are funded by voluntary donations from happy users. Find races and runners near you, get advice, play games, share blogs, measure routes - and much more!

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