Race Time Predictor: 5K, 10K, Half & Marathon
THE DRYDEN / RUNNING TOOLS EVERY STRIDE COUNTS
RACE TIME PREDICTOR
One race in.
Every race predicted.
Enter a recent race result to predict your times over other distances, with the pace to aim for in each.
Got a goal time? Plan exactly how fast to run each kilometre or mile.
Race split calculatorBEHIND YOUR NUMBER
A little understanding
goes a long way.
How are predictions made?
We use Pete Riegel’s formula, which scales a known race time to a new distance.
T2 = T1 × (D2 ÷ D1)^1.06
We also estimate your VDOT, Jack Daniels’ measure of running fitness, from the same result.
Why might my marathon be slower?
Predictions assume you have trained for the new distance. For the marathon, most runners need 50+ km a week and regular long runs to match the prediction.
Is this calculator for me?
It suits anyone who runs, from beginners to club runners. Results are estimates based on standard formulas. Heat, hills, wind and how you feel on the day all change real performance.
YOUR RUN. A CLEARER PLAN.Calculations happen on your device.