Calculators Fit
● Cardio & running

Your VO2max from a simple field test.

Estimate your maximal oxygen uptake with three proven non-lab tests — Rockport Walk Test, 1.5-Mile Run, or Cooper 12-Minute Run — and see your fitness category by age and sex.

🫁
VO2max — Maximal Oxygen Uptake
Estimate aerobic capacity from Rockport Walk, 1.5-Mile Run or Cooper 12-Min Run
✏️

Your data

yr
lb
min
sec
bpm
min
sec
mi
📊

Your result

— mL/kg/min
—
Enter your test data above
VO2max estimate—
Fitness category ACSM norms for age/sex—
Method used—
Advertisement
Display · data-ad-format="auto"

How it's calculated

Three field tests, one aerobic fitness number

VO2max (maximal oxygen uptake) is the maximum rate at which your body consumes oxygen during intense exercise, expressed in mL per kg of body weight per minute. This calculator supports three validated non-lab tests: the Rockport 1-Mile Walk Test (Kline et al., 1987), the 1.5-Mile Run Test (ACSM), and the Cooper 12-Minute Run Test (Cooper, 1968). For a 35-year-old male walking 1 mile in 15 min at 130 bpm and 165 lb, estimated VO2max ≈ 37 mL/kg/min (fair category).

Each formula uses a different set of inputs but all estimate the same underlying aerobic capacity. Rockport is best for those who cannot run safely; the 1.5-Mile and Cooper tests require all-out effort for maximum accuracy. All results are estimates; lab treadmill VO2max testing remains the gold standard.

Rockport (Kline 1987)
132.853 − (0.0769 × weight_lb) − (0.3877 × age) + (6.315 × sex_M)
− (3.2649 × time_min) − (0.1565 × HR_bpm)

1.5-Mile Run (ACSM)
3.5 + 483 ÷ time_minutes

Cooper 12-Min Run
(distance_m − 504.9) ÷ 44.73
  1. 1
    Convert inputs to formula units
    —
  2. 2
    Apply the selected formula
    —
  3. 3
    Clamp result to valid range (10–85 mL/kg/min)
    —
  4. 4
    Look up ACSM fitness category for age & sex
    —

Understand the terms

VO2max
The maximum rate of oxygen consumption during maximal effort exercise. The gold-standard measure of aerobic fitness, expressed in mL O₂ per kg bodyweight per minute (mL/kg/min).
Aerobic capacity
The ability of the cardiovascular and respiratory systems to supply oxygen to working muscles. VO2max is its most common quantitative measure.
Maximal oxygen uptake
Synonymous with VO2max. Determined by cardiac output (heart rate × stroke volume) and the muscles' ability to extract oxygen from blood.
Lactate threshold
The exercise intensity at which lactic acid begins to accumulate faster than it is cleared. Typically occurs at 50–80% of VO2max in trained individuals. Endurance performance depends strongly on both VO2max and lactate threshold.
See the full glossary →
Disclaimer: estimation tool for informational and planning purposes, using validated field-test equations (Kline et al. 1987, ACSM, Cooper 1968). Estimated VO2max may differ from a laboratory-measured value. Results depend on test execution — pacing, surface, weather, and heart rate measurement all affect accuracy. Does not replace assessment by a physician, exercise physiologist, or sports scientist.
Advertisement
In-article · data-ad-layout="in-article"

Frequently asked questions — VO2max

What is VO2max?
VO2max is the maximum rate at which your body can consume oxygen during intense exercise. It is expressed in mL of oxygen per kilogram of body weight per minute (mL/kg/min) and is considered the gold standard measure of aerobic fitness and cardiovascular endurance. Higher VO2max values correspond to greater endurance performance capacity.
What is a good VO2max score?
Norms vary by age and sex. For a 30-year-old man, a score above 52 mL/kg/min is excellent and above 60 is superior. For a 30-year-old woman, above 45 is excellent and above 52 is superior. Elite endurance athletes such as marathon runners or cyclists often exceed 70–80 mL/kg/min. Your score should be compared to ACSM norms for your specific age and sex group.
How does the Rockport Walk Test work?
You walk exactly 1 mile (1.6 km) as fast as possible on a flat, measured surface, then record your total time and heart rate immediately at the finish. The Kline et al. (1987) formula uses your age, sex, weight, walk time, and finishing heart rate to estimate VO2max. It is ideal for people who cannot safely run due to injury or fitness level.
What is the Cooper 12-minute run test?
Developed by Dr. Kenneth Cooper in 1968, the Cooper Test requires you to run or jog as far as possible in exactly 12 minutes on a flat surface. The distance covered is then plugged into the formula: VO2max ≈ (distance in metres − 504.9) ÷ 44.73. It is widely used by the military, police forces, and sports organizations worldwide because it requires minimal equipment.
Can I improve my VO2max?
Yes. VO2max is highly trainable. High-intensity interval training (HIIT), tempo runs at lactate threshold, and progressive aerobic volume all stimulate improvements. Sedentary individuals who begin structured training often see 10–20% gains within 8–12 weeks. Genetics set an upper limit, but consistent cardio training can substantially raise your aerobic capacity at any age.

📚 Learn more — official sources

🏛️ Organization ACSM — Guidelines for Exercise Testing and Prescription American College of Sports Medicine reference for VO2max norms, fitness categories by age and sex, and field-test protocols. See official source → 🔬 Study Kline et al. (1987) — Rockport Walk Test original paper Original validation study of the 1-mile walk test equation for estimating VO2max from walk time, heart rate, weight, age, and sex. See on PubMed → 🔬 Study Cooper (1968) — A means of assessing maximal oxygen intake Landmark paper by Dr. Kenneth Cooper establishing the 12-minute run test and its correlation with measured VO2max in over 100 men. See on PubMed → 🏛️ Organization WHO — Physical activity fact sheet World Health Organization guidance on physical activity levels, aerobic fitness, and health benefits of cardiorespiratory endurance training. See official source →

About the VO2max Calculator

VO2max — maximal oxygen uptake — is the most widely used measure of cardiorespiratory fitness. Lab measurement requires a treadmill, gas analysis equipment, and a physician-supervised protocol. These three validated field tests let anyone estimate VO2max with minimal equipment: a measured course, a stopwatch, and a heart rate monitor (for Rockport).

The Rockport Walk Test (Kline et al., 1987) is ideal for beginners and older adults. The 1.5-Mile Run Test is a standard protocol used by the U.S. Armed Forces and ACSM. The Cooper 12-Minute Run is one of the most replicated fitness tests in history. All three produce estimates within ±5 mL/kg/min of lab-measured VO2max under controlled conditions.

Advertisement
Multiplex · data-ad-format="autorelaxed"