VO2 Max Estimator
Estimate your VO2 max using the Rockport 1-mile walk test or the Cooper 12-minute run formula. Get your mL/kg/min value and fitness category in seconds.
What Is VO2 Max?
VO2 max is the maximum rate your body can take in and use oxygen during hard exercise, measured in milliliters of oxygen per kilogram of body weight per minute (mL/kg/min). It is the gold-standard measure of cardiorespiratory fitness and is a strong predictor of all-cause mortality and long-term health. A lab treadmill test is the most accurate, but field tests like Rockport and Cooper give a solid estimate.
Rockport 1-Mile Walk Test
Rockport is the easier and safer option — walk one mile as fast as you can, then record your time in minutes and your heart rate at the finish. VO2 max = 132.853 − (0.1692 × weight in kg) − (0.3877 × age) + (6.315 × sex, where male = 1 and female = 0) − (3.2649 × time in minutes) − (0.1565 × heart rate in bpm). It works well for beginners and older adults who cannot sustain a run.
Cooper 12-Minute Run Test
Cooper is the classic athlete test — run as far as possible in 12 minutes on a flat track, then enter the distance in meters. VO2 max = (distance in meters − 504.9) / 44.73. It is more accurate for regular runners but requires a hard sustained effort, so warm up properly and skip it if you have heart disease, uncontrolled blood pressure, or recent injury.
Important Safety Note
This calculator is informational only and is not medical advice. If you are sedentary, over 40, or have any cardiovascular risk factors, talk to your clinician before maximal exertion tests. Stop immediately if you feel chest pain, severe shortness of breath, or dizziness. Field-test VO2 max is an estimate — expect ±10% variation versus a lab test.
Frequently Asked Questions
What is a good VO2 max for my age?
For a 30-year-old, good is 45-50 for men and 38-45 for women. For a 50-year-old, good is 38-43 for men and 33-38 for women. Elite endurance athletes routinely exceed 65 (men) or 55 (women). Any increase in your own VO2 max — regardless of category — is a meaningful fitness gain.
Which test is more accurate, Rockport or Cooper?
Cooper is more accurate for trained runners because the effort is maximal. Rockport is more accurate for beginners and older adults because pacing a walk is easier than pacing a hard 12-minute run. A lab VO2 max test with gas exchange is the gold standard.
How can I improve my VO2 max?
Two approaches stack well: 2-3 weekly zone-2 sessions of 45-60 minutes at conversational pace to build aerobic base, plus one interval session like 4 repeats of 4 minutes hard with 3 minutes easy recovery. Expect 5-15% gains over 8-12 weeks with consistency.
Does my smartwatch estimate VO2 max?
Yes — Apple Watch, Garmin, and Fitbit estimate VO2 max from heart rate, speed, and stride data during runs. Their estimates are reasonable for trends but can differ from lab measurement by 10-15%. Use them to track change over time, not absolute numbers.
Is this tool medical advice?
No. This is an informational fitness estimate. If you are sedentary, over 40, or have heart disease, diabetes, or high blood pressure, talk to your clinician before performing a maximum-effort test. Stop any test immediately if you feel chest pain, severe breathlessness, or dizziness.