There are several pace predictors that extrapolate your times across all distances based on the time you may have for one distance.  These predictors are only a guideline and must be used with a grain of salt.  Goal time predictors are not always perfect but they are a good place to start if you have a best time in another distance and want to guess what is reasonable for a marathon (or vice versa).  Use goal time predictor

Posted in: Goal Times and Effort