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.