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What's the difference between running race predictor calculators?

Posted by George Parker on
Which Running Race Calculator to Choose

I'm currently trying to qualify for the NYC Marathon with a time standard in either the half marathon or marathon. I was curious what my "predicted" half marathon time currently is based on my December marathon performance. 

Well, it's no easy answer! I found 5 different calculation methods with very different results. Here are my thoughts on how to navigate the options and choose the best calculator for you. 

 

 

 

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