VO2 Max Estimator Calculator

VO₂ max is the maximum amount of oxygen your body can use during intense exercise, measured in millilitres of oxygen per kilogram of body weight per minute (ml/kg/min). It is one of the best single indicators of aerobic (cardiovascular) fitness. This calculator estimates your VO₂ max from a simple field test you can do yourself, then places the result in a fitness category for your age and sex and builds five heart-rate training zones to work with.

How to use it

1. Pick a test method you can actually perform.
2. Enter your age, sex, and resting heart rate (best measured first thing in the morning, before getting out of bed).
3. Fill in the result for your chosen test.

The estimate, your fitness category, the full norms table, your heart-rate zones, and a short interpretation update instantly — everything runs in your browser, and nothing you enter is sent anywhere.

The four tests and their formulas

• Cooper 12-minute run — run as far as you can in 12 minutes on a flat course, then enter the distance in metres. VO₂max = (distance − 504.9) / 44.73
• 1.5-mile (2.4 km) run — time yourself over 1.5 miles. VO₂max = 483 / time_minutes + 3.5
• YMCA 3-minute step test — step onto a 12-inch (30 cm) box at 24 steps per minute for 3 minutes, sit down, and count your pulse for the first recovery minute. Men: 111.33 − 0.42 × recovery_HR; Women: 65.81 − 0.1847 × recovery_HR
• Resting HR (Uth–Sørensen) — no exercise needed. VO₂max = 15.3 × (HRmax / HRrest), where HRmax = 208 − 0.7 × age.

Fitness category by VO₂ max (ml/kg/min)

Cooper Institute / ACSM-style cutoffs. The tool highlights the band you fall into for your own age and sex.

Men

Age	Poor	Fair	Good	Excellent	Superior
20–29	0–37	38–43	44–51	52–56	57+
30–39	0–33	34–39	40–47	48–51	52+
40–49	0–29	30–35	36–43	44–47	48+
50–59	0–24	25–31	32–39	40–43	44+
60+	0–20	21–26	27–35	36–39	40+

Women

Age	Poor	Fair	Good	Excellent	Superior
20–29	0–27	28–33	34–41	42–46	47+
30–39	0–26	27–32	33–39	40–44	45+
40–49	0–24	25–30	31–37	38–41	42+
50–59	0–20	21–26	27–33	34–37	38+
60+	0–18	19–23	24–30	31–34	35+

Heart-rate training zones

The zones use the Karvonen (heart-rate reserve) method: target = (HRmax − HRrest) × intensity + HRrest, with HRmax = 208 − 0.7 × age. Zone 1 is 50–60% of your reserve, up to Zone 5 at 90–100%. Training across the right zones — mostly easy aerobic work with a smaller share of hard intervals — is how most people raise their VO₂ max over time.

How accurate is a field-test estimate?

Field tests are a good, low-cost way to track change over weeks and months, but each formula carries an error of a few ml/kg/min. Results depend on pacing, terrain, temperature, sleep, and how consistently you measure your heart rate. Use the same test under the same conditions each time to compare fairly.

Disclaimer: these are estimates, not laboratory measurements. They are not a substitute for a graded exercise test performed in a clinical setting, and they are not medical advice. Consult a physician before beginning a new exercise programme, especially if you have a heart condition or other health concerns.