What is VDOT?
VDOT is a metric developed by legendary running coach Jack Daniels. It represents your current running fitness level. Unlike a laboratory $\text{VO}_2\text{Max}$ test, which measures your pure oxygen uptake, VDOT accounts for your running economy and psychological factors by using a real-world race result to determine your score.
Once you know your VDOT, you can mathematically predict your finish time for any other distance and, more importantly, determine your exact training paces to maximize your workouts without overtraining.
Understanding Training Paces
Training at the right intensity is crucial. Daniels identifies five specific paces based on your VDOT:
- Easy (E): Run at ~65% of your aerobic capacity. Builds cellular adaptations and injury resistance. Makes up the bulk of your mileage.
- Marathon (M): Run at ~80%. Used primarily to practice race-day pacing and nutrition.
- Threshold (T): Run at ~88%. "Comfortably hard." Improves your body's ability to clear blood lactate.
- Interval (I): Run at ~97.5%. Hard intervals (like 800m repeats) designed to boost your $\text{VO}_2\text{Max}$.
- Repetition (R): Run at ~110%. Very fast, short bursts (like 200m or 400m) with full recovery to improve speed and running economy.
Equivalent Race Times
If you run a 5K in 20:00, your VDOT is roughly 49.8. Our calculator can take that VDOT and reverse-engineer what a 49.8 runner should theoretically run for a Half Marathon or a full Marathon.