Find your fitness age by comparing your VO2 max with NTNU HUNT3 average values for men and women in each age band, from your 20s to over 70.
Fitness Age as a VO2 Reference Comparison
This corrected tool replaces the former implausible equation with directly measured NTNU Cardiac Exercise Research Group HUNT3 means. It compares an entered VO2 max with six sex-specific age-band averages and reports the closest reference band plus the difference from the user’s chronological-age band.
Formula and Method
The calculator selects the mean for the entered sex and age band, subtracts that mean from the entered VO2 max, then finds the smallest absolute difference across the six published means, reporting both bands for an exact midpoint tie. Values outside the listed means stay at the nearest end band with an explicit warning; no age is extrapolated. It performs a table lookup and comparison rather than claiming a universal fitness-age equation.
NTNU directly measured mean VO2peak values in mL/kg/min
| Reference | Range or value | Use or interpretation |
|---|---|---|
| 20s | Women 43 | Men 54 |
| 30s | Women 40 | Men 49 |
| 40s | Women 38 | Men 47 |
| 50s | Women 34 | Men 42 |
| 60s | Women 31 | Men 39 |
| 70+ | Women 27 | Men 34 |
How to Use the Result
Enter VO2 max from a consistent measured or field-test method. Read the result as a population-reference comparison. The most useful tracking comparison is usually your own repeated result under the same test conditions.
Assumptions and Limitations
The closest reference band is not a biological age, diagnosis, prognosis, or individualized percentile. Reference means depend on the HUNT3 sample and test methods. Chronological input is limited to 20–90, the study range. The final published group is labelled Over 70 years; this tool uses 70+ as a coarse lookup band. This nearest-mean method is a descriptive comparison, not the separate validated NTNU non-exercise Fitness Calculator algorithm. Sex categories here follow the two groups reported by the source table, and the calculator does not infer physiology or identity beyond that published comparison.
Sources
- NTNU Cardiac Exercise Research Group: Fitness numbers, HUNT3 Fitness Study, checked October 19, 2026.
