VDOT is a pseudo-VO2max value that reflects your current running performance. Coach Jack Daniels created it as a practical training tool. Unlike lab VO2max tests, VDOT is calculated entirely from race results and accounts for running economy, making it a reliable fitness indicator.

Which race distance gives the most accurate VDOT?

Any distance from 1500m to the marathon works well, provided the race was run at maximum effort on a flat course in good conditions. The 5K and 10K are the most popular choices because they are common and repeatable.

How often does VDOT change?

VDOT typically improves every 4–8 weeks in a structured training block, then plateaus. Beginners may see faster gains. Retest after each race or time trial to update your training paces.

Why are my easy-pace and marathon-pace so different from race pace?

Easy runs should be done at a conversational effort (typically 60–75% of max heart rate). Running easy paces faster than prescribed is one of the most common training mistakes — it increases injury risk without proportional fitness gain.

What is the difference between Threshold and Interval pace?

Threshold pace (T pace) targets your lactate threshold — a comfortably hard effort you could sustain for about an hour. Interval pace (I pace) is closer to VO2max effort, run for 3–5 minute repeats with recovery jogs between. Both are prescribed by Jack Daniels as distinct quality sessions.

Are these paces for outdoor running or treadmill?

These paces are calibrated for outdoor flat running. On a treadmill, increase the incline by 0.5–1% to approximate outdoor effort. Track workouts should align closely with the prescribed paces.

Running VDOT Calculator

Name: Running VDOT Calculator
Availability: InStock
Author: Nham Vu

Enter a recent race time to get your VDOT fitness score, predict equivalent race times at other distances, and find your personalized training paces.

Your Race Input

Race Distance

Finish Time

Format: mm:ss or h:mm:ss

Enter a race time on the left and click Calculate VDOT.

Summary

Enter a recent race time to get your VDOT fitness score, predict equivalent race times at other distances, and find your personalized training paces.

How it works

Select the race distance you ran and enter your finish time (hh:mm:ss or mm:ss).
The calculator looks up your VDOT value from Jack Daniels' performance tables.
Equivalent race times are predicted for all standard distances using the same VDOT.
Five training pace zones are derived from your VDOT: Easy, Marathon, Threshold, Interval, and Repetition.
Use the training paces to structure your weekly workouts and build aerobic fitness safely.

Use cases

Determine your current running fitness level with a single number.
Set realistic race time goals for an upcoming event.
Find the correct easy-run pace so you do not overtrain.
Calculate threshold and interval paces for quality workouts.
Track VDOT improvement over a training cycle.
Compare fitness across different race distances.
Plan a marathon training block with scientifically grounded paces.
Confirm whether a race result was a true performance-equivalent effort.

Frequently Asked Questions

Last updated: 2026-06-09 · Reviewed by Nham Vu