Marathon Predictions from Half Marathon times

22 watchers
Apr 2013
1:46pm, 19 Apr 2013
2,124 posts
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2H+30 is pretty right for me. I struggled to get under 2h for a half and last year did 1h58 followed by 4h35 at Brighton a few weeks later, which I thought I probably could have done a few minutes faster. I suppose, the faster you are, the smaller the "add on" figure should be. Lord Fetch's patented predictor also suggests my marathon time (which I was quite proud of at the time) was just slightly rubbish by about 5 minutes.
Sep 2013
11:13am, 9 Sep 2013
13,073 posts
  • 0
It's taken me a while to find this thread, is there a link to the improved calculator from elsewhere in the site? I looked for it under training-calculators but couldn't find it
Mar 2017
8:12am, 7 Mar 2017
44 posts
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Maintained by fetcheveryone
Try this improved calculator for predicting marathon times from half marathon:

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