Calculate your aerobic capacity (VO2 max). Enter your age and resting heart rate to get a rough estimate and general guidance.
Safety note: This calculator provides estimates for educational purposes only and is not medical advice or a diagnosis. Heart‑rate zones and VO2 max estimates may be inaccurate—talk to a clinician before using HR‑based intensity targets if you have heart disease, high blood pressure, diabetes, are pregnant, have symptoms with exercise (chest pain, dizziness/fainting, unusual shortness of breath), or take heart‑rate–altering medications (e.g., beta blockers). Stop exercise and seek care if severe symptoms occur.
- All Sports and Fitness Calculators
- Heart Rate Reserve Calculator (HRR)
- Resting Heart Rate Calculator
- Heart Rate Zone Calculator
VO2 Max Formula
To estimate VO2 max using heart rate, divide your maximum heart rate (bpm) by your resting heart rate (bpm), then multiply by 15.3.
\mathrm{VO}_{2\max} \approx 15.3 \times \frac{HR_{\max}}{RHR}Method notes: The calculator uses common published test equations (heart‑rate ratio estimate, Cooper 12‑minute test, Rockport 1‑mile walk, 1.5‑mile run estimate, and Daniels-style VDOT from race performance). “Fitness category” cutoffs vary by source, protocol, and population; if you want the original protocols/tables, look up these test names in an exercise physiology text (e.g., ACSM-style resources) or peer‑reviewed publications.
This calculator provides an estimate of your VO2 max (often expressed in mL/kg/min). VO2 max is the maximum rate at which your body can take in and use oxygen during intense exercise.
In general, higher cardiorespiratory fitness is associated with a higher VO2 max, which is why VO2 max is often used as an indicator of aerobic capacity. Below is a table that outlines comparative fitness levels of male and female adults based on VO2 max.
Cardiovascular Fitness Level
One may ask, how do I lower my resting heart rate?
Regular endurance/aerobic training is one of the most effective ways to lower resting heart rate over time, but it isn’t the only factor. Resting heart rate can also improve with better sleep, stress management, improved cardiovascular health, changes in body composition, reduced stimulant use (e.g., nicotine), and appropriate medical treatment/medications when indicated. If you’d rather estimate VO2 max from performance instead of heart rate, use the Field Tests or Race Result tabs in the calculator above.
VO2 Max Calculator
What does VO2 max stand for?
VO2 max (also written as VO2max) refers to maximal oxygen uptake: the maximum rate at which your body can take in, transport, and use oxygen during intense exercise (commonly reported in mL/kg/min). Higher values generally indicate better cardiorespiratory fitness.
Having a higher VO2 max can provide an advantage in endurance performance, but real-world outcomes also depend on factors like efficiency/economy, lactate threshold, training, technique, pacing, and motivation.
How to calculate aerobic capacity
Aerobic capacity is often discussed in terms of VO2 max, which is an important part of cardiorespiratory fitness. However, overall “fitness level” can also include strength, power, flexibility, body composition, and sport-specific skill.
The heart-rate formula below is a simple way to estimate VO2 max, but it can be inaccurate for some individuals and isn’t the same as lab-measured VO2 max.
Estimated VO2 max = 15.3 × Max Heart Rate (bpm) ÷ Resting Heart Rate (bpm)
To estimate your resting heart rate, measure your pulse while you are relaxed (ideally after waking). Counting for 30–60 seconds is usually more reliable than a very short count. Because resting heart rate can vary from day to day, take multiple measurements and use an average.
Determining your max heart rate is a little more difficult. Many equations exist for estimating max heart rate, and most are based mainly on age (with some models also considering other factors). For more information, you can head over to our heart rate zone calculator which goes over common formulas for estimating max heart rate.
For more health and fitness calculators, click here.
