VO₂ Max Calculator (Cooper 12-Minute Run Test)
VO₂ max is the most oxygen your body can take in and use per minute (mL · kg⁻¹ · min⁻¹) — the gold-standard marker of cardiorespiratory fitness. Kenneth H. Cooper's 1968 field test takes a single number — the distance you cover in an all-out 12-minute run — and plugs it into a linear regression to estimate VO₂ max, which is then compared against age- and sex-specific reference bands.
Please enter a valid number
VO₂ max (peak oxygen uptake)
42.4
mL · kg⁻¹ · min⁻¹
Good
Cooper Institute fitness band
Distance (km)
2.40 km
Distance (mi)
1.49 mi
Estimate (±10%). Untrained adults should clear maximal-effort tests with a doctor first.
Formula
VO₂ max (mL · kg⁻¹ · min⁻¹) = 22.351 × distance (km) − 11.288 Equivalent imperial form: VO₂ max ≈ 35.97 × distance (mi) − 11.29 Mile-to-kilometre conversion uses the exact 1959 international yard-and-pound value, 1 mi = 1.609 344 km.
- · Primary source — Cooper, K. H. (1968). "A means of assessing maximal oxygen intake — correlation between field and treadmill testing." JAMA 203(3): 201–204. The regression was fitted between treadmill-measured VO₂ and 12-minute field-test distance.
- · Reference bands follow the Cooper Institute (Dallas, Texas) age/sex tables, widely reproduced in ACSM Guidelines for Exercise Testing and the ExRx Cooper VO₂ chart. Values are in mL · kg⁻¹ · min⁻¹.
- · Warm up and cool down with ~5 minutes of easy jogging on either side. A flat 400 m running track gives the most reliable distance; wind, hills or hard surfaces noticeably affect results.
- · Expected accuracy is ±10%. For a precise number, use a gas-exchange (metabolic cart) test under an incremental treadmill protocol in a sports-science lab.
- · If you have cardiovascular disease, are sedentary, pregnant, or have any chronic condition, get medical clearance before attempting a maximal-effort field test.
- · Other common field protocols: Rockport 1-mile walk (low-impact), Bruce treadmill protocol (clinical), Astrand-Rhyming submaximal bicycle test. This tool implements the Cooper 12-minute run only.
Frequently asked
How hard should I run during the 12 minutes?
Aim for the fastest steady pace you can hold for the full 12 minutes — not a sprint that dies in the last third, and not a jog that you could go faster than. First lap: pick a pace that feels "hard but sustainable", then try to hold it lap after lap, with a small surge in the last two minutes if you have it. Most people overpace their first Cooper test; after two or three attempts you find your real rhythm and the estimate becomes much more reliable.
How does the Cooper estimate compare to a lab VO₂ max test?
Cooper's original paper reported a correlation r ≈ 0.90 between 12-minute distance and treadmill-measured VO₂ max, with a standard error of around ±3.5 mL · kg⁻¹ · min⁻¹. In practice that means about ±10%: if your lab number is 50, the field estimate is likely to land somewhere between 45 and 55. Good enough to track your own progress over time, but not interchangeable with another person's lab number.
What counts as a "good" VO₂ max?
There is no single answer — it depends on age and sex. Under the Cooper Institute bands, a 30-year-old man is "good" at ≥ 45 and "superior" at ≥ 49.5; a 30-year-old woman is "good" at ≥ 31.5 and "superior" at ≥ 40. VO₂ max typically declines by ~10% per decade in sedentary adults from age 20 onward, so always compare against the same-age, same-sex band. The tool does this lookup for you automatically.
Can I run this on a treadmill instead?
Yes, but set the incline to 0% or 1% to mimic outdoor air-resistance, and make sure the belt is calibrated. Cooper's original regression was fitted to outdoor distance, so a treadmill can over- or under-estimate VO₂ max by 1–2 mL · kg⁻¹ · min⁻¹. The most consistent approach is to repeat the test on the same surface — track or treadmill — and track the trend rather than chase a single absolute number.
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