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Biological Age Calculator

Work out biological age instantly with clear inputs, formula shown and shareable results.

About Biological Age Calculator

Expresses cardiorespiratory fitness as an age: the age at which your measured VO2max would be average, given the typical annual decline.

Formula

Fitness age

Biological age = chronological age - (measured VO2max - population average at that age) / annual decline in VO2max

Worked example

With the default values below, Biological Age Calculator returns Fitness-based biological age of 36.1. Change any input above and every figure here is recalculated in your browser.

Inputs used

Chronological ageaccepts 18–90 years
45 years
Measured VO2maxaccepts 10–80 mL/kg/min
38 mL/kg/min
Population average VO2max at your age and sexaccepts 10–70 mL/kg/min
34 mL/kg/min
Annual decline in VO2maxaccepts 0.1–1 mL/kg/min per year
0.45 mL/kg/min per year

Results

Fitness-based biological age
36.1 years
Years younger than chronological age
8.9 years
VO2max above the age average
4.00 mL/kg/min
Comparison
Fitness well above the age norm

Step by step

  1. 1Values used
  2. 2Fitness age
  3. 3Fitness-based biological age= 36.1 years
  4. 4Years younger than chronological age= 8.9 years
  5. 5VO2max above the age average= 4.00 mL/kg/min
  6. 6Comparison= Fitness well above the age norm

Assumptions and limits

  • The result is derived only from the 4 inputs listed above. Anything not among them is not part of the calculation.
  • In particular, this calculator does not take inflation, tax or fees or charges into account.
  • Figures are rounded for display to 2 decimal places, so totals built from several rounded parts can differ slightly from the unrounded arithmetic.
  • Educational estimate only. Not a substitute for professional clinical judgement, and must not be used to make treatment or dosing decisions.
  • This is an estimate for general information and not professional medical advice. See the full disclaimer for the limits that apply to this kind of calculator.

How these calculators are built and tested is described on the Methodology page. If a figure looks wrong, please report it.

Educational estimate only. Not a substitute for professional clinical judgement, and must not be used to make treatment or dosing decisions.

Frequently Asked Questions

Why use VO2max?

It is the single best-validated physiological predictor of all-cause mortality, which makes it a defensible basis for a fitness age.

Is this the same as an epigenetic age?

No. Methylation clocks measure something different and are not interchangeable with a fitness-based age.

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