Instructions:
1. Warm up
2. Run as far as you can within 12 minutes. Should preferebly be performed on a 400 m track.
3. Note how far you got and enter the distance, weight and gender in the calculator.

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The 12 min run test is also called the Cooper test. It was developed in the sixties as an easy tool to estimate VO2max in soldiers.

The validity of this test is quite good if you are accustomed to running. For people not used to running it can be difficult to administer the speed from start to end and also peripheral discomfort in the legs can limit performance rather than circualatory capacity.

Reference:
Correlation between field and treadmill testing as a means of assessing maximal oxygen intake.
Cooper KH
JAMA. 1968 Jan 15;203(3):201-4.