What VDOT actually measures
VDOT is Jack Daniels' 'pseudo-VO₂max' from Daniels' Running Formula. It folds aerobic capacity together with running economy, so two runners with the same lab VO₂max but different economy get different, more useful values.
It comes from the Daniels & Gilbert (1979) equations for the oxygen cost of running at a given velocity and the fraction of VO₂max sustainable for a given race duration. One race result solves for the VDOT that fits.
The five training paces
Easy runs sit at 59–74% VO₂max. Marathon pace is 75–84%. Threshold is 83–88% VO₂max, the comfortably hard tempo you could race for about an hour. Interval pace is 95–100% VO₂max, run as 3–5-minute reps. Repetition pace is 105–120% VO₂max, short fast reps with full recovery.
One race, every pace
Given your VDOT, the model inverts the velocity equation at each intensity to produce all five paces. Use a recent, all-out race of at least 5 km. Shorter efforts are skewed by anaerobic contribution, so 5 km, 10 km or a half marathon give the most stable VDOT.
Re-testing and limits
VDOT is a snapshot. Re-race every 4–8 weeks and all five paces move with it. A hilly, hot or poorly paced race reads low. The equations were fitted to well-trained distance runners over 1500 m to the marathon, so VDOT loses precision for sprints and ultras.
How to run a VDOT time trial
A rested, all-out 5 km on a track or flat course gives a clean number.
- 1
Warm up thoroughly
10–15 minutes of easy jogging, then a few strides.
- 2
Pick a flat, accurate course
A 400 m track or a flat, measured road loop. Avoid hills, wind and heat.
- 3
Run an all-out 5 km
Hold the hardest pace you can keep even to the finish.
- 4
Enter the time
Select 5 km and type your finish time for your VDOT and all five paces.
Worked example
A runner races 5 km in 20:00 (4:00 /km):
| Race input | 5 km in 20:00 |
| VDOT | ≈ 49.8 |
| Easy pace | 4:54–5:53 /km |
| Threshold pace | 4:16–4:28 /km |
| Interval pace | 3:51–4:01 /km |
Every pace derives from the single VDOT of 49.8.
Frequently asked questions
What is a good VDOT?
A recreational runner often sits at a VDOT of 35–45, a competitive club runner 50–60, and elite distance runners exceed 70–85. A VDOT of 50 is roughly a 19:57 5 km. The useful comparison is your own trend.
VDOT vs pace zones, what's the difference?
VDOT is the single fitness number. Pace zones are its output: five training paces, Easy, Marathon, Threshold, Interval and Repetition, each tied to a band of VO₂max. One input, five zones.
How do I improve my VDOT?
Improve VDOT with consistent training, mostly easy aerobic running (59–74% VO₂max) plus regular threshold and interval work. Re-run an all-out 5 km or 10 km every 4–8 weeks to update VDOT and all derived paces.
What's the difference between Threshold and Interval pace?
Threshold pace is 83–88% VO₂max, a comfortably hard tempo you could race for about an hour. Interval pace is 95–100% VO₂max, run as 3–5-minute reps to develop maximal aerobic power.
Which race distance should I enter?
Enter a recent, all-out race of at least 5 km. A 5 km, 10 km or half marathon gives the most stable VDOT because it is paced aerobically. Efforts under 1500 m carry a large anaerobic component and over-estimate VDOT.
Is VDOT the same as VO₂max?
No. Lab VO₂max measures oxygen uptake only. VDOT folds in running economy, so two runners with identical VO₂max can have different VDOTs. That is why VDOT predicts race pace better.
Sources
- Jack Daniels, Daniels' Running Formula (3rd ed.). VDOT tables and the five training-intensity paces (E, M, T, I, R).
- Daniels & Gilbert (1979). “Oxygen Power: Performance Tables for Distance Runners.” The %VO₂max-vs-duration and VO₂-vs-velocity equations behind VDOT.
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- VDOT Explained: How Jack Daniels Turns One Race Into Every Training PaceWhat VDOT is, how Jack Daniels' Running Formula turns one race into easy, marathon, threshold, interval and repetition paces, and where it misleads.
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