VDOT Calculator — Score & Race Predictions | prommer.net
Calculate your VDOT from any race result. Get personalized training paces for Easy, Marathon, Threshold, Interval, and Repetition zones plus race time predictions.
VDOT Running Calculator
Enter any recent race result to calculate your VDOT score, get training paces for all 5 Daniels zones, and predict equivalent race times across distances.
Enter any recent race result to calculate your VDOT score, get training paces for all 5 Daniels zones, and predict equivalent race times across distances.
What is VDOT?
VDOT is a concept developed by legendary running coach Jack Daniels and Jimmy Gilbert in 1979. It represents your effective VO2max — a single number that captures both your aerobic capacity and your running economy.
Unlike a laboratory VO2max test, which only measures oxygen uptake, VDOT is derived from your actual race performance. Two runners with identical VO2max values may have very different VDOT scores because one may be more economical (efficient) in their running form.
Your VDOT score serves as the foundation for calculating appropriate training paces across all five of Daniels' training zones. A higher VDOT indicates better running fitness — either through greater aerobic capacity, better running economy, or both.
The 5 Training Zones Explained
Jack Daniels identified five distinct training intensities, each targeting specific physiological adaptations:
| Zone | Intensity | Purpose | Typical Workout |
|---|---|---|---|
| Easy (E) | 59-74% VO2max | Builds aerobic base, promotes recovery | 30-60 min easy run |
| Marathon (M) | ~79% VO2max | Race-specific marathon endurance | Marathon-pace long runs |
| Threshold (T) | ~88% VO2max | Improves lactate clearance | 20 min tempo or cruise intervals |
| Interval (I) | ~98% VO2max | Develops maximal oxygen uptake | 5×1000m with equal rest |
| Repetition (R) | Mile race pace | Improves speed and running economy | 8×200m or 6×400m with full rest |
Already know your VDOT? Apply it to your training plan with our VDOT Training Paces calculator →
How to Use These Paces
Easy runs should feel easy. The most common mistake runners make is running Easy pace too fast. You should be able to hold a conversation comfortably. If in doubt, go slower — the physiological benefits are nearly identical across the Easy range.
Threshold pace is "comfortably hard." You can speak in short phrases but not hold a conversation. Tempo runs at this pace typically last 20-30 minutes, or you can break them into cruise intervals (e.g., 4×8 min with 1 min rest).
Interval pace should feel controlled. Hard but not all-out. Each repeat should feel similar — if the last ones are significantly slower, you started too fast or the rest was too short.
Repetition pace is about form, not fitness. Run fast with good mechanics. Full recovery between reps (2-3 min for 400s). If you can't maintain pace and form, the workout is done.
Accuracy & Limitations
The VDOT model works best when:
- Your race was recent (within 4-6 weeks) and on a flat course
- The distance was between 1500m and the marathon
- You were fully rested and tapered for the race
- Conditions were cool and calm (heat and wind reduce performance)
Predictions between adjacent distances (e.g., 10K to half marathon) tend to be more accurate than large jumps (e.g., 1500m to marathon). The model assumes equal training for all distances — a runner who only trains for the 5K may find their marathon prediction optimistic.
For distances beyond the marathon, additional factors like nutrition strategy, fueling tolerance, and muscular fatigue become dominant, making the model less reliable.
Frequently Asked Questions
VDOT scores typically range from 30 to 85. A score of 30-34 represents a beginning runner, 40-44 is intermediate, 50-54 is competitive (sub-20 min 5K for men), 60+ enters elite territory, and scores above 75 are world-class. The score depends on age, sex, and training background — what matters most is improvement over time.
The VDOT model assumes equal aerobic fitness across all distances. In practice, the marathon requires specific adaptations — glycogen storage, fat oxidation efficiency, and mental endurance — that shorter races don't test. If your training is primarily speed-focused, your actual marathon potential may lag behind the prediction. The gap closes with marathon-specific training.
Recalculate every 4-6 weeks or after a new personal best. Your VDOT changes as your fitness improves (or declines). Using an outdated VDOT means your training paces may be too slow (missing the stimulus) or too fast (risking overtraining). A 5K time trial is the quickest way to update your VDOT.
Use your most recent race result from the last 4-6 weeks. If you have multiple recent results, use the one that gives the highest VDOT — this best represents your current fitness. Significantly different VDOT values from different distances may indicate an imbalance in your training (e.g., more speed work than endurance).
VO2max is a laboratory measurement of maximum oxygen consumption (ml/kg/min). VDOT is an 'effective VO2max' derived from race performance that also accounts for running economy — how efficiently you convert oxygen into forward motion. Two runners with identical VO2max values can have different VDOT scores. VDOT is more practical for training prescription because it reflects real-world performance.