Marathon Prediction Calculator: Just Tell Me How Fast I'll Run

Marathon racing is a combination of passion, drive, conditioning, and science.

This predictor calculates and predicts the time it might take you to run a marathon given a previous race time. Based on formulas by Pete Riegel and Mervyn Davies, I’ve created a Marathon Eight Ball. No shaking required.

I have pre-calculated several marathons and I will be adding more very soon. With these marathons I can estimate the fade and surge you can expect to experience from elevation changes along the course. Elevation is factored for every .05 miles and pace is affected accordingly. This prediction calculator only accounts for elevation along a given course. I have no way of accounting for weather, or your conditioning and training up to the race.

Again, this is merely a prediction. There are no promises or guarantees when you use this to estimate a finish time. These times are clearly very possible if you are conditioned and ready for the distance. You cannot expect to run a 36:25 5-miler and then run a solid 3:32 marathon! Conditioning, number of marathons completed, and training play a significant role in racing a marathon.