CLICK HERE to jump straight down to the race time predictor calculator
If you are looking for a quick way to guess your next race time from a previous race, time trial or flat out training run, use this race time predictor to get an estimate. Just enter your previous race with the time, and choose the type of future race. You only need to enter the minutes field, but you can fine tune with hours and seconds too. This race time predictor calculator has the added bonus of showing your predicted pace for your target race too!
For example, enter your recent 10K time to get a half marathon predictor of finish time and target pace. The yellow boxes are the fields you can enter.
This race predictor calculator uses the ratio of your two race distances to the power of 1.06. However, the calculations used for the marathon time predictor are slightly different from the shorter run calculations, instead using the power of 1.1 which I find gives a more true-to life result, especially for the first couple of marathons which are normally a huge learning process. Those with large amounts of miles might find they can perform better on marathon day and those with low consistency will perform slower.
As you can imagine, any race time predictor calculator assumes you have trained for your event. If the furthest you’ve ever run is 5K, entering that time and asking for a marathon time prediction will only give you an expectation of what you might be capable of after many seasons of training. The closer your target race distance is to your recent race distance, the more realistic the race predictor calculation is likely to be. For example, if you want a half marathon time prediction, a recent 10K or 10 Mile time will give you a better target half marathon time than if you’d used a recent 5K time.
For more specific conversions of time and distance speed to pace, try the running pace calculator.
Race Time Predictor Calculator
Use this race time predictor to estimate your next race time from a previous race:
