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VO2 max measures the maximum amount of oxygen your body can use during intense exercise — one of the most widely used indicators of aerobic fitness.
This calculator estimates your VO2 max using the Cooper 12-minute run test, a field test that requires nothing more than a track or measured route.
How it works
Run as far as you can in exactly 12 minutes, then enter the distance you covered. The calculator applies the Cooper test formula to estimate your VO2 max in milliliters of oxygen per kilogram of body weight per minute (mL/kg/min).
- Enter distance covered in 12 minutes.
- Enter distance unit.
- Click Calculate to see your results.
Examples
A 2,400 meter effort
Covering 2,400 meters in 12 minutes gives an estimated VO2 max of about 42.4 mL/kg/min, in the "Fair" general fitness range.
A 3 km effort
Covering 3 kilometers in 12 minutes gives an estimated VO2 max of about 55.8 mL/kg/min, in the "Excellent" general fitness range.
Who should use it
- Tracking aerobic fitness changes over a training program.
- Getting a baseline fitness estimate without access to lab testing equipment.
Industry applications
- Running, endurance, and athletic training
- Fitness assessment and coaching
Advantages
- Requires no special equipment — just a measured distance and a stopwatch.
- Based on the well-established, widely used Cooper test formula.
Limitations
- Less precise than laboratory-based VO2 max testing with direct gas analysis.
Common mistakes to avoid
- Pacing poorly and running out of energy early, which underestimates true fitness — the Cooper test works best with even, sustained effort for the full 12 minutes.
- Not warming up before the test, which can affect performance and produce a lower reading than actual fitness.
Best practices
- Warm up for several minutes before starting the timed run, and try to pace evenly rather than starting too fast and fading.
Tips
- Repeat the test every several weeks under similar conditions (same route, similar weather) to track genuine fitness changes over time.