EXERCISE PHYSIOLOGY & TRAINING SCIENCE
Jack Daniels' VDOT Calculator
Extrapolate your latest race performance into scientific training paces, understand physiological adaptations, and time track intervals accurately with zero GPS drift.
Jack Daniels' VDOT Calculator & Track Interval Splits
Calculate your scientific VDOT fitness score based on Dr. Jack Daniels' Running Formula. Extrapolate training paces (Easy, Marathon, Threshold, Interval, Repetition) and track lap splits (200m, 400m, 800m, 1000m) with zero GPS error.
Recent Race Performance
| Zone / Intensity | Pace (min/km) | Speed | Purpose & Physiology |
|---|
When running intervals on a track, GPS watch distance often drifts due to tight corners. Use these exact lap split times with your stopwatch for 100% precision.
| Intensity | 200m | 400m (1 Vòng) | 800m (2 Vòng) | 1000m | 1200m (3 Vòng) | 1600m (4 Vòng) |
|---|
| Distance | Predicted Time | Avg Pace | Weekly Mileage Need |
|---|
Continue Optimizing Your Run With Connected Tools
Connect your calculation with pacing strategy, fueling plans, and lab-tested running gear.
Build 12-Week Plan with VDOT
Apply your exact VDOT paces into a structured 12-week schedule with Google / Apple Calendar sync.
Build 12W Plan →Yasso 800s Workout Planner
Test your aerobic engine with 10x800m repeats and an 8-week progressive track buildup.
Yasso 800s Tool →Print Wrist Pace Band
Print waterproof wristbands with custom split checkpoints to nail your race pacing.
Create Pace Band →Frequently Asked Questions: VDOT & Pacing
Giải đáp nhanh các thắc mắc phổ biến về công cụ và kỹ thuật chạy bộ.
What is Dr. Jack Daniels' VDOT in running?
VDOT is a measure of current running fitness developed by legendary coach Dr. Jack Daniels and mathematician Jimmy Gilbert. Rather than lab-tested VO2max alone, VDOT represents your 'effective VO2max'—combining cardiovascular capacity with running economy.
What do the 5 VDOT training paces (E, M, T, I, R) stand for?
Each zone targets specific physiological adaptations: Easy (E) builds aerobic mitochondria and recovery; Marathon (M) conditions fat-burning and pace discipline for 42K; Threshold (T) raises your lactate clearance threshold; Interval (I) develops VO2max power in 3–5 min repeats; and Repetition (R) sharpens biomechanics and neuromuscular speed.
Why should track workouts use split times instead of GPS pacing?
Due to continuous tight turns on standard 400m tracks, GPS smartwatches frequently suffer from signal drift and distance distortion of 5–10%. Timing your laps in seconds (200m, 400m, 800m) with a stopwatch guarantees 100% effort accuracy.