Training · Free tool
VO₂ Max Calculator
VO₂ max is the highest rate at which your body can use oxygen during hard exercise — the single best lab number for aerobic fitness. You do not need a lab to get a good estimate. Enter a recent race result, a 12-minute Cooper test, or your max and resting heart rate, and this calculator returns your estimated VO₂ max, the equivalent VDOT, and — if you add your age and sex — where that sits against general fitness norms.
Three ways to estimate VO₂ max
From a race: a recent all-out race is the most useful input for a runner. This tool uses the Daniels–Gilbert model — the same performance-to-fitness relationship behind VDOT — to turn your distance and finish time into a VO₂ max value.
From a Cooper test: run as far as you can in exactly 12 minutes on a flat course or track, then enter the distance. It is a quick field test that needs no race.
From heart rate: if you know your true maximum and resting heart rates, the ratio between them estimates VO₂ max (Uth and colleagues). It is the roughest of the three, but it needs no running test at all.
VO₂ max, VDOT, and your race times
For the race method, the number you get is your VDOT — Jack Daniels’ shorthand for a runner’s current fitness. Two runners with the same VDOT should race similar times across distances, which is why VDOT drives equivalent-performance predictions and training paces.
To turn this into paces or predicted times, use the race-time predictor, the pace chart, or the training-plan generator linked below.
How accurate is it?
These are estimates for general guidance, not a laboratory measurement. Field formulas typically land within a few points of a lab test for trained runners, and the race method is the most reliable when the effort was a genuine all-out race in good conditions. Heat, hills, pacing, and altitude all pull the estimate around.
The fitness-category band uses general population reference ranges by age and sex, so treat it as a broad guide rather than a precise percentile.
Frequently asked questions
What is a good VO₂ max for my age?
It depends on age and sex — a VO₂ max in the high 40s to 50s is strong for most adult recreational runners, and elite distance runners often exceed 70. Add your age and sex above to see which general band your estimate falls into.
Is VO₂ max the same as VDOT?
They are closely related. The race-based estimate here is your VDOT — a fitness value derived from race performance. It behaves like a VO₂ max but is anchored to how fast you actually race rather than to a gas-exchange test.
Which method should I use?
If you have a recent all-out race, use that — it is the most reliable for runners. Use the Cooper test if you can do a 12-minute time trial, and the heart-rate method only if you know your true max and resting rates.
Can I improve my VO₂ max?
Yes. Consistent aerobic volume plus regular threshold and VO₂-max-pace intervals raise it over weeks and months. The training-plan generator builds those sessions into a plan.