Quick calculators
Your number from any watch or test, your rank for your age, your zones, the session that raises it, and what your weight does to it. A minute each, US units first.
What's my VO2 max?
Pick your watch or test. Your number with its likely range, your rank for your age and your fitness age.
Test it yourself
A mile walk, a 1.5-mile run, a 12-minute run or your mile pace, or a treadmill speed and grade, turned into your VO2 max with its error.
Where do you stand?
Your percentile and group for your age and sex, how far the next group is, and your rank as the years pass.
Your heart rate zones
Your max three ways, zone 2 in beats a minute and the band for the hard minutes of a 4x4.
What's my max heart rate?
Your max by age from the three formulas, the range most real maxes sit in, and your zones from it.
The 4x4 timer
Four hard minutes, three easy, four times. Full screen, with beeps and your own heart rate band.
Weight and your VO2 max
Slide your weight and watch the number move while the engine stays the same.
Get your true VO2 max
Your watch number put through a few sanity checks: the probable range with the reasoning, your fitness age, and twelve dated weeks to raise it.
