Race Predictor Calculator
Predict race finish times across distances using the Riegel formula. Enter a known race result to estimate times for 5K, 10K, half marathon, marathon, and ultra distances.
Inputs
Results
Known Race Pace
8:03
How to Use This Calculator
- Select your Known Race Distance from the dropdown.
- Enter your actual finish time for that race in Hours, Minutes, and Seconds.
- Review predicted finish times for 1 Mile, 5K, 10K, Half Marathon, Marathon, and 50K.
- Check the corresponding paces for each predicted distance.
- Use predictions to set realistic goal times before registering for a new race.
Related Calculators
Marathon Training Pace Calculator
Calculate training zone paces (easy, tempo, interval, repetition) from your goal marathon time using Daniels' VDOT methodology.
Age-Graded Performance Calculator
Calculate your age-graded running performance score. Compare your race time against age and gender standards to see how you rank and what your time equates to at any age.
Elevation-Adjusted Pace Calculator
Calculate your grade-adjusted pace for hilly courses using elevation gain and loss data. Based on physiological cost of running uphill and downhill.
Running Economy Calculator
Calculate your oxygen consumption (VO2) at a given running speed to assess running efficiency. Compare your economy against benchmarks.
Heat-Adjusted Pace Calculator
Calculate how heat and humidity affect your running pace. Get an adjusted target pace and heat risk assessment for hot weather running.