VO2 Max Calculator for Runners

Runners can estimate VO2 max from a recent race result using Jack Daniels' running formula. Enter your race distance and finish time to see your estimated maximal aerobic capacity and the fraction of VO2 max you sustained during the race.

Jack Daniels Formula

Daniels' method calculates race velocity, estimates oxygen cost at that pace, and determines what percentage of VO2 max you could sustain for the race duration. The formula works best for distances between about 1500 m and a marathon.

Using Race Results

Use a recent, all-out race effort for the most accurate estimate. A 5K or 10K time from the past few months is ideal. Training runs and time trials on measured courses also work well.

Frequently Asked Questions

What race distance should I use?

Any distance from 1500 m to a marathon works. Shorter races reflect speed; longer races reflect endurance. A 5K or 10K is a popular choice for reliable estimates.

How accurate is the Daniels formula?

It provides a solid estimate for trained runners but cannot replace laboratory testing. Individual running economy and pacing strategy can shift results by a few ml/kg/min.

What does VO2 max percent mean?

It shows what fraction of your maximal aerobic capacity you used during the race. Shorter, faster races use a higher percentage of VO2 max than longer endurance events.

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VO2 Max Runners Calculator