Running VO2 Max Calulator
VO2 Max sounds like something only serious athletes care about. It's not. It's just a number that tells you how fit your heart and lungs are — and estimating yours takes about thirty seconds. Enter a recent race time or your heart rate data below and the calculator does the rest.
VO2 Max Estimator
Choose a method to estimate your aerobic capacity.
Distances under 5K produce less reliable VO2 Max estimates. A 5K or longer gives a much better result.
Best sourced from a maximal effort test or a hard race — not a formula.
Uses the Tanaka formula (208 − 0.7 × age). Estimated max HR: .
Measure first thing in the morning before getting up, over 3–5 days, and average the results.
Check your numbers — resting HR should be lower than your max HR, and both should be in a realistic range.
Your VO2 Max estimate
Based on the Jack Daniels / Oxygen Power formula. Based on the Uth–Sørensen–Overgaard–Pedersen formula.
Compared to s aged .
Add your age above for a more accurate classification.
| Category | VO2 Max range |
|---|---|
Race method: Jack Daniels Oxygen Power formula. Heart rate method: Uth et al. (VO2max ≈ HRmax/HRrest × 15.3). Both are estimates — lab testing remains the gold standard.
Fill in your details on the left and your VO2 Max estimate will appear here.
How it works
How this works
VO2 Max is a measure of how much oxygen your body can use while running flat out. The higher the number, the more aerobic horsepower you have. It's the metric that sits behind most fitness scores on GPS watches and is widely used as a benchmark for cardiovascular fitness.
The calculator estimates your VO2 Max using one of two methods. The race-based method uses the Jack Daniels Oxygen Power formula — it takes your finishing time for a known distance and works backwards to estimate the aerobic capacity required to run it. The heart rate method uses a simpler ratio between your maximum and resting heart rate, developed by exercise physiologists Uth, Sørensen, Overgaard, and Pedersen.
Neither is as accurate as a lab test on a treadmill with a mask strapped to your face, but both give you a meaningful ballpark from information you probably already have.
Why it's useful
Why is working out VO2 Max helpful?
Your VO2 Max estimate is most useful as a reference point, not a verdict. If you've just started running and you're curious where you sit compared to others your age, this gives you a starting point. If you've been training for a few months and want to know whether it's actually working, running the calculator again and comparing the number is a reasonable (if rough) way to see progress.
The classification table — poor through to superior — is based on normative data broken down by age and sex. Most recreational runners land somewhere in the fair-to-good range, which is perfectly fine. The number doesn't tell you how enjoyable your runs are, how consistent you've been, or whether you're actually improving as a runner day to day. It's one data point.
If your watch already gives you a VO2 Max estimate, this can be a useful sense-check. Don't be surprised if they differ slightly — they're all working from slightly different formulas.
Frequently asked
FAQs about this VO2 Max Calculator
What's a good VO2 Max for a beginner runner?
Anywhere from the low 30s to low 40s (mL/kg/min) is typical for recreational runners who are reasonably active. Elite distance runners sit in the 60s and 70s, but that's not a useful comparison. What matters more than the raw number is the direction it moves as your training becomes more consistent.
Why does my watch show a different number?
Wearables estimate VO2 Max using their own proprietary algorithms — usually a combination of pace, heart rate, and heart rate variability — and they're calibrated differently across brands. A small gap between your watch and this calculator is normal. A large gap usually means one set of inputs is off: a maximal heart rate that's been estimated rather than measured, for example, or a race time that wasn't a genuine hard effort.
Can I use this to set a race goal?
Not directly, but it's related. A higher VO2 Max generally supports faster race times, and the race-based method essentially works in reverse — it derives your VO2 Max from a time you've already run. If you want to go from VO2 Max to a predicted finish time, the race predictor tool is the better starting point for that.