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VO2 max calculator: estimate your cardio fitness
Estimate your VO2 max — the gold-standard measure of cardiovascular fitness — without a lab test. Uses the George et al. (1997) non-exercise prediction formula from age, sex, BMI, and activity level.
VO2 max calculator
Your result
Near average for your age group
About this tool
What VO2 max measures — and why it matters
VO2 max (maximal oxygen uptake) is the highest rate at which your body can consume oxygen during intense exercise. It is the gold-standard measure of cardiovascular fitness — higher values indicate a more efficient heart, lungs, and muscles.
Lab measurement requires a maximal exercise test to exhaustion. This calculator uses the George et al. (1997) non-exercise prediction formula, which estimates VO2 max from age, sex, BMI, and self-reported activity level to within ±5 ml/kg/min of measured values for most people.
Step by step
How to use the VO2 max calculator
- 1
Enter your age, sex, height and weight
These measurements are used to calculate your BMI, which the formula requires.
- 2
Select your physical activity rating (PAR)
Be honest about a typical week. Most people overestimate their activity level, which inflates the VO2 max estimate.
- 3
Your estimated VO2 max and fitness category appear instantly
Use it as a baseline and re-test after a training block to track improvement.
Methodology
The George non-exercise formula (1997)
VO2max = 56.363 + 1.921 × PAR − 0.381 × age − 0.754 × BMI + 10.987 × sex
sex: 1 = male, 0 = female · BMI = weight kg ÷ height m²
| Category | Men (ml/kg/min) | Women (ml/kg/min) |
|---|---|---|
| Very poor | Below 31.5 | Below 23.6 |
| Poor | 31.5–38.3 | 23.6–28.8 |
| Fair | 38.4–44.1 | 28.9–32.8 |
| Good | 44.2–50.1 | 32.9–38.0 |
| Excellent | 50.2–55.3 | 38.1–42.9 |
| Superior | 55.4 and above | 43.0 and above |
Worked example
Example calculation
A 35-year-old man, 178 cm, 80 kg (BMI ≈ 25.2), PAR = 4 (3× per week). VO2max = 56.363 + 1.921×4 − 0.381×35 − 0.754×25.2 + 10.987×1 ≈ 56.363 + 7.684 − 13.335 − 18.991 + 10.987 ≈ 42.7 ml/kg/min — Fair category.
Be aware
Assumptions and limitations
- Non-exercise predictions have a typical error of ±5 ml/kg/min — useful for tracking trends, not for precise medical assessment.
- PAR self-report is the largest source of error — people tend to overestimate their activity level.
- More accurate for untrained to moderately trained adults; less accurate for elite athletes.
- Results are estimates for information only, not a clinical measurement.
Questions
Frequently asked questions
What is a good VO2 max?
For men under 40, a VO2 max above 44 ml/kg/min (Good category) is considered above average. For women under 40, above 33 ml/kg/min is Good. Elite endurance athletes typically exceed 60 (men) or 55 (women). Average, untrained adults fall in the Fair range — roughly 38–44 for men and 29–33 for women.
How can I improve my VO2 max?
High-intensity interval training (HIIT) — short bursts at near-maximum effort — produces the largest VO2 max gains. Zone 2 aerobic training (a comfortable pace at which you can hold a conversation) builds the aerobic base that supports it. Most people see meaningful improvement within 6–12 weeks of consistent training.
Is this the same as aerobic capacity?
VO2 max and aerobic capacity are often used interchangeably. Technically, VO2 max is the ceiling — the maximum rate of oxygen consumption. Aerobic capacity can also describe efficiency at submaximal efforts. For practical purposes the two terms refer to the same underlying measure of cardiovascular fitness.
What is a good VO2 max by age?
VO2 max declines naturally with age — roughly 1% per year after 25. For men aged 20–29, a good VO2 max is 44–51 ml/kg/min; for 40–49, 39–45 ml/kg/min; for 50–59, 36–42 ml/kg/min. For women: 20–29, 33–39 ml/kg/min; 40–49, 29–35 ml/kg/min; 50–59, 25–31 ml/kg/min. Endurance training can offset much of this age-related decline.
How is VO2 max measured accurately?
Laboratory VO2 max testing uses a maximal graded exercise test on a treadmill or cycle ergometer with expired gas analysis — the gold standard. Field tests (like the Cooper 12-minute run or a timed 1.5-mile run) are practical alternatives with reasonable accuracy. Fitness watches (Garmin, Apple Watch, Polar) also estimate VO2 max from heart rate and pace data, typically to within ±5 ml/kg/min of lab values.
Estimates, not medical advice
FitnessCalculator.info provides general health information for educational purposes only and does not replace advice from a qualified doctor or exercise physiologist.