One fitness level, two different estimates
Measuring VO2max properly means a maximal test in a laboratory with a mask. In the field it is estimated instead, from a distance run or a shuttle run result, and the number depends on which test you used. This calculator takes a Cooper 12-minute distance and a 20m shuttle run result together, places the two estimates side by side, and reports the gap both in mL/kg/min and as a share of their mean. Enter one test alone and that single estimate is still calculated.
The Cooper equation subtracts 504.9 from the distance in metres and divides by 44.73. The shuttle run uses the Ramsbottom equation, adding the fraction of the level completed to the level itself, multiplying by 3.46 and adding 12.2. Because each level holds between 7 and 16 shuttles, the same shuttle count means different things at different levels. Cooper distance is entered in miles and converted at 1 mile = 1609.344 m, while the shuttle course stays metric. Checked October 2026.
Both equations carry limits. Cooper was validated on 115 airmen with a correlation of about 0.90 against laboratory values, and a validation study of the shuttle run equation in adolescents concluded that individual-level accuracy is questionable. For that reason this tool assigns no grade or score and reports only the two estimates and their difference. Both tests are maximal efforts, so check with a clinician first if you have a cardiovascular condition.
FAQ
The tests and the samples the equations were built on differ. Cooper is a steady 12-minute run while the shuttle run is a progressive test full of turns, so the same fitness produces different figures.
Both are estimates and neither replaces a laboratory measurement. Rather than choosing a winner, repeat the same test under the same conditions and watch your own change.
No. This page uses no grade table. The VO2max grade charts in wide circulation use different bands from source to source, so they cannot serve as an official standard.