What Is a VDOT Calculator?
A VDOT calculator turns a recent race result into a single fitness number — your VDOT — and uses it to prescribe training paces for every type of run. Developed from the work of renowned coach Jack Daniels, VDOT represents your effective running fitness based on race performance rather than a lab VO2 max test. Enter a race distance and time, and the calculator returns your VDOT along with easy, marathon, threshold, interval, and repetition paces.
How to Use the VDOT Calculator
- Select a race distance — 5K, 10K, half marathon, marathon, or another standard distance.
- Enter your finish time for that race.
- Calculate — see your VDOT and full set of training paces.
The Five Training Paces
| Pace Type | Purpose |
|---|---|
| Easy (E) | Build aerobic base and aid recovery |
| Marathon (M) | Race-specific endurance for long efforts |
| Threshold (T) | Improve lactate threshold; comfortably hard |
| Interval (I) | Boost VO2 max with hard repeats |
| Repetition (R) | Sharpen speed and running economy |
Why VDOT Works
VDOT lets runners of different abilities train at the right relative intensity. Because the paces are all derived from your current race fitness, they scale as you improve — re-test with a new race and your VDOT and paces update. Training too fast on easy days or too slow on hard days are common mistakes that VDOT-based paces help you avoid.
Race Time Equivalents
VDOT also predicts equivalent performances across distances. A given VDOT corresponds to a 5K, 10K, half, and marathon time, so a strong 5K implies a target marathon time at equal fitness. This helps set realistic race goals and spot whether endurance or speed is your limiter.
Frequently Asked Questions
What is VDOT in running?
VDOT is a measure of running fitness derived from race performance, popularized by coach Jack Daniels. It is used to assign training paces and predict equivalent race times across distances.
How do I find my VDOT?
Enter a recent race distance and finish time. The calculator computes your VDOT from that performance and lists your corresponding training paces.
What are the different training paces for?
Easy builds aerobic base, marathon pace develops race endurance, threshold raises your lactate threshold, intervals boost VO2 max, and repetitions sharpen speed and economy.
How often should I update my VDOT?
Re-test after a solid race or time trial, typically every 4–6 weeks during focused training, so your paces keep pace with your improving fitness.
Is this VDOT calculator free?
Yes — it is completely free, requires no signup, and gives both your VDOT and all training paces.