VO₂max Calculator
How big is your engine? Estimate your VO₂max from a recent all-out run — or roughly from your resting heart rate.
Know your engine — then build it
Your VO₂max is your engine's ceiling. Get the free weekly hybrid template — 3 runs, 2 lifts, mapped out — plus new tools as they drop.
Want it tracked automatically? The app estimates your VO₂max continuously from your training data — get your Hybrid Level in the app → (free, 2 min).
What your VO₂max actually tells you
What is VO₂max?
VO₂max is the maximum amount of oxygen your body can take in and use per minute, measured in millilitres per kilogram of body weight per minute (ml/kg/min). It's the ceiling of your aerobic engine — the single best summary number for cardiovascular fitness.
What is a good VO₂max?
For men in their 20s–40s, roughly 35–42 is average, 42–50 is good and 55+ is excellent; women typically run about 5 points lower. Elite endurance athletes reach 70–85+. VO₂max also declines naturally with age — roughly 10% per decade after 30 — but consistent training slows that decline dramatically.
How accurate is estimating VO₂max from a race time?
Surprisingly accurate — if the race was a true all-out effort. Race-based estimates like the Daniels/Gilbert VDOT formula typically land within a few ml/kg/min of a lab test. The resting-heart-rate method is far rougher and should be treated as a ballpark only. A lab test with breath-by-breath gas analysis remains the gold standard.
Can I improve my VO₂max — and how fast?
Yes. Beginners often gain 10–20% within a few months of consistent endurance training. High-intensity intervals — for example 4 × 4 minutes near 90–95% of max heart rate — are the most time-efficient driver, while easy aerobic volume builds the base. The fitter you already are, the slower further gains come.
Why does VO₂max matter for hybrid athletes?
A bigger engine means you recover faster between sets, hold pace under fatigue and absorb more weekly training volume without breaking down. It's also one of the strongest known predictors of long-term health and all-cause mortality — for a hybrid athlete, cardio isn't optional, it's half the job.