VO2 Max Calculator
Estimate your aerobic capacity based on your race performance.
Race Performance
VO2 Max by Age and Sex
Values in ml/kg/min. Based on normative data from the Cooper Institute and American College of Sports Medicine. These decline roughly 1% per year after 25 — but consistent training slows that significantly.
Men (ml/kg/min)
| Age | Poor | Fair | Good | Excellent | Superior | Elite |
|---|---|---|---|---|---|---|
| 20-29 | <34 | 34-40 | 41-47 | 48-53 | 54-59 | 60+ |
| 30-39 | <32 | 32-38 | 39-44 | 45-50 | 51-56 | 57+ |
| 40-49 | <30 | 30-35 | 36-42 | 43-48 | 49-53 | 54+ |
| 50-59 | <27 | 27-32 | 33-38 | 39-44 | 45-49 | 50+ |
| 60+ | <24 | 24-29 | 30-35 | 36-41 | 42-46 | 47+ |
Women (ml/kg/min)
| Age | Poor | Fair | Good | Excellent | Superior | Elite |
|---|---|---|---|---|---|---|
| 20-29 | <28 | 28-34 | 35-40 | 41-45 | 46-51 | 52+ |
| 30-39 | <26 | 26-32 | 33-37 | 38-43 | 44-48 | 49+ |
| 40-49 | <24 | 24-29 | 30-35 | 36-41 | 42-46 | 47+ |
| 50-59 | <22 | 22-27 | 28-33 | 34-38 | 39-43 | 44+ |
| 60+ | <20 | 20-25 | 26-31 | 32-36 | 37-41 | 42+ |
Where do runners typically land? A recreational runner logging 15-25 miles per week usually scores 35-45. Someone doing structured training with intervals and tempo runs typically hits 45-55. Sub-3 hour marathoners are almost always above 55. These numbers aren't destiny — running economy matters just as much. Two runners with identical VO2 max scores can have very different race times.
What VO2 max actually tells you
VO2 max measures the maximum amount of oxygen your body can use during intense exercise, expressed in milliliters per kilogram per minute (ml/kg/min). It's the single best indicator of aerobic endurance. A recreational runner might score in the mid-30s; a competitive club runner in the 50s; an elite marathoner above 70. The number itself doesn't tell you how fast you are — running economy, lactate threshold, and mental toughness all matter too — but it sets the ceiling on your aerobic performance. Two runners with the same VO2 max can run very different race times depending on how efficiently they use that oxygen.
How the Daniels & Gilbert formula works
This calculator uses the formula developed by Jack Daniels and Jimmy Gilbert, two exercise physiologists who studied thousands of race performances. The equation — VO2 = −4.60 + 0.182258v + 0.000104v² — takes your running velocity in meters per minute and estimates the oxygen cost of sustaining that pace. It's most accurate for distances between 1500m and the marathon because the aerobic energy system dominates in that range. Shorter sprints rely too heavily on anaerobic energy to give a clean estimate. If you only have a 5K or 10K time, that works well. Marathon times can slightly overestimate VO2 max because pacing strategy and fueling start to matter more than pure aerobic capacity.
How to read the classification tables
The tables below show VO2 max norms by age group and sex, based on data from the Cooper Institute and American College of Sports Medicine. Classifications (Poor through Elite) shift significantly with age — a score of 45 ml/kg/min is 'Good' for a 25-year-old man but 'Superior' for a 55-year-old. Women's norms are 6–10 points lower than men's at any given age, which reflects physiological differences in blood volume and hemoglobin concentration — not fitness. Always compare your number against your own age and sex group, not the overall population.
How to improve your VO2 max
VO2 max responds best to high-intensity interval training. Classic sessions include 3–5 minute repeats at 95–100% of your max heart rate, with equal recovery — think 1km repeats at your 5K pace with 3 minutes of jogging between each. But you don't need to hammer intervals every day. Most of the gains come from a mix: 80% of your weekly volume at easy, conversational pace to build your aerobic base, and 1–2 hard sessions per week to push the ceiling higher. Consistency matters more than any single workout. Runners who train regularly for 6–8 weeks typically see measurable VO2 max improvements, even without changing their total mileage.