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The Cooper test: run/walk as far as you can in 12 minutes on flat ground (a track or GPS watch), warmed up, on a day you feel well. VO2 max = (distance - 504.9) / 44.73. Watch estimates from resting data are convenient but this field test, honestly run, is more telling. Not for anyone advised against maximal exercise.
What The VO2 Max Calculator Works Out
- Estimated VO2 max: the maximum oxygen your body can use per kg per minute, exercise physiology's headline figure, estimated from Cooper's 1968 twelve-minute run: distance in metres minus 504.9, divided by 44.73. Sedentary adults span roughly 30 to 40, the seriously trained the 50s, and elite cross-country skiers and Tour riders reach the 80s and low 90s.
- Rating for your age: age-and-sex graded bands from below average to excellent. Age declines the number a steady several percent per decade, with trained people running a decade or two "younger", so the age-graded rating rather than the raw figure is the fair mirror.
- Test method (advanced): gentler doors to the same number. The 1.5-mile run (VO2 = 3.5 + 483 / time in minutes) suits runners; the Rockport 1-mile walk test uses walk time, finishing heart rate, weight, age and sex for anyone not ready for a maximal run; and the resting heart rate method (15.3 x max HR / resting HR) needs no test at all but is the roughest of the four.
- Heart rate and max heart rate (advanced): the Rockport test needs your pulse immediately at the finish; the heart rate method needs a true resting pulse taken on waking, with max heart rate measured or defaulting to 220 minus age.
- Absolute VO2 max (advanced): litres of oxygen per minute (relative VO2 x body weight), the figure a lab mask reports. It favours bigger people, which is why the per-kg figure is used for comparisons.
- Fitness age (advanced): the age group in which your score would count as a solid "Good", a more motivating framing than the decimal. Large cohort studies rank cardiorespiratory fitness among the strongest predictors of all-cause mortality, alongside smoking status.
- Equivalent 5k time (advanced): your score converted back to a 12-minute distance and extended to 5 km with Riegel's formula, a sanity check against your parkrun time.
- To reach the next band (advanced): the points and the extra 12-minute metres needed. The steepest health returns accrue from moving out of the bottom fitness quintile, which makes "below average to average" the most valuable journey on the whole scale. The recipe is a base of easy aerobic volume plus a weekly dose of hard intervals; the 4 x 4-minute protocol is the most studied.
- Caveats: the Cooper test is genuinely maximal, a hard pace-judged effort that itself requires some fitness, and watch estimates infer from pace and heart rate and drift with GPS mood. Retest the same course in the same conditions a few times a year, treat the trend as the signal and the decimal as decoration. Not for anyone advised against maximal exercise.
Further reading: NHS: exercise guidelines.