Race Prediction – how fast should you run?
We’ve done it, we’re committed. We’ve signed up for a race. Handed over cash, told friends and family. Asked for sponsorship. It’s definitely happening! The question you’ll be asked most often, (by others, and you will ask yourself too), is: “what time do you want to get?”
Most of us have an inkling, and even if you really do just want to ‘get round’, it is a really good idea to have an idea about what time you want to ‘get round’ in. Whatever time you want to finish in, by knowing what that is, you can work out your pace so you can run or run/walk your way round a course with an even pace.
Running at the same pace the whole way is the best way to hit a time without blowing up and slowing down unintentionally. Going too fast at the start is a classic mistake. I relax and smile when I stick to my planned pace while others surge past me at the start, knowing I will pass them later as they’re walking at mile 18. A good rule of thumb is that for every minute too fast that you run the first half of a marathon, you’ll lose two minutes in the second half!
The best way to get a prediction and find your pace, is to do another event, and use online tools to work out your prediction for your chosen event.
How to make your prediction as accurate as possible
There are a couple of important ways to make your prediction as accurate as you can:
Use a distance as close to your target race distance as possible
So, to predict a marathon, a half marathon time will give you a more accurate prediction than a 5k time.
Use a recent result
Your school 800m time wont give you an accurate readout, unless maybe you’re at exactly the same fitness now. The tools work based on your current fitness.
Think about your experience
New runners often find that they can perform well in one race distance pretty quickly but may take a few goes running a different distance before they really learn how to run it. This is very common for your first marathon. In this case it’s best to be conservative, enjoy it, and you’ll always get a Personal Best for your first one anyway. Hopefully you’ll have a good experience with your brilliant pacing and come back for more!
A prediction isn’t a golden ticket to that PB you’ve always wanted. It presumes you continue to be fit and carry on training. You can’t just plug in a time, admire the prediction and put your feet up! So keep going, with the added motivation of that predicted time you could get!
So how fast can I go?
The million dollar question! Below is a table of quite conservative estimates of marathon times from half marathon times.
For more accurate predictions based on what you’ve already run, check out some online calculators. The Fetch marathon predictor works off half marathon time and the Fetch race predictor calculates any distance off any other distance race time. These are based off evidence of real runners’ performances over a range of times, rather than pure stats or elite performances only, and both link to other calculators if you’d like to investigate further.
A final word of caution. Not everyone will fit these perfectly. I personally don’t think I fit the calculators, and tend to run better over longer distances than my shorter distance results predict. So use them as a guide but don’t feel limited by them.
So good luck, enjoy it and I hope you run a PB / PR! Let me know how you get on and ask any questions in the comments below.
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You can get pace band temporary tattoos or pace pockets here: