Race Time Predictor
Predict finish times for 5K, 10K, half marathon and marathon from a recent race result using Riegel and Cameron formulas, with required pace tables and confidence notes.
| Race | Distance | Riegel 1.06 | Endurance adj. 1.08 | Pace / km |
|---|
Plan the pace: Pace calculator | estimate fitness: VDOT calculator | train intensity: Heart rate zones.
How to use
Enter a recent all-out race distance and finish time. The table predicts common road race times with the classic Riegel model and a slightly more conservative endurance-adjusted model.
Race Time Predictor helps athletes and everyday trainees get a clear, actionable number they can use in the gym, on the road or in the pool — without uploading any data. All calculations run locally in your browser.
Use the presets to learn the expected inputs, then adjust for your own session. Export or share the result when you want a training log or a quick plan for your next workout.
FAQ
What can I use Race Time Predictor for?
Predict finish times for 5K, 10K, half marathon and marathon from a recent race result using Riegel and Cameron formulas, with required pace tables and confidence notes. It is built for practical training decisions, not medical diagnosis.
How do I use Race Time Predictor correctly?
Start with an example or preset, then replace the values with your own measured weight, time, distance or heart rate. Small input errors can change the output a lot.
How accurate is Race Time Predictor?
Formulas and tables are widely used coaching estimates. Individual fitness, sleep, heat and technique still matter — treat the result as a guide and progress gradually.
Is my data uploaded?
No. Inputs stay in your browser. Optional session history uses localStorage on this device only.
Is this medical or coaching advice?
No. It is a free educational calculator. Consult a qualified coach or clinician for personalised programmes, especially if you have injuries or health conditions.
Can I share or export the result?
Yes. Most pages support copy, CSV download and a shareable result image so you can keep a log or send the plan to a training partner.