Biological Age Calculator
Estimate your biological age from seven lifestyle factors — exercise, smoking, sleep, diet, alcohol, stress, and body weight — based on how each is linked to healthy ageing.
How This Calculator Works
Biological age is a measure of how well your body is functioning compared to your chronological age. This calculator applies year-based adjustments for seven lifestyle factors that longevity research consistently links to health outcomes: regular vigorous exercise and high-quality diets are associated with slower biological ageing, while smoking, chronic sleep deprivation, heavy alcohol use, sustained stress, and obesity are associated with faster ageing.
The strongest single factor is smoking — current smokers show markers consistent with roughly five additional years of ageing — followed by physical inactivity and obesity. The good news: most factors are modifiable, and studies show measurable improvement in ageing biomarkers within months of lifestyle change. This tool provides an indicative estimate only; clinical biological age testing uses blood biomarkers, DNA methylation, and other laboratory measures.
How the Biological Age calculator works
This free biological age calculator runs entirely in your browser using standard mathematical formulas. Enter your figures, tap Calculate, and results update instantly — no signup required.
Figures are estimates for general information. Always verify important decisions with a qualified professional where relevant.
- Input your values using the fields above (numeric keypad on mobile).
- Results use precise floating-point arithmetic rounded for display.
- Refresh or change inputs and recalculate anytime.
Worked example
- Choose typical values for a common biological age scenario.
- Enter those values in the calculator fields above.
- Tap Calculate and compare the on-screen result with the expected formula outcome.
- Adjust one input at a time to see how the result changes.