🧬 Biological Age Calculator
How old is your body really?
Written by Albert Mateos · Founder & Editor
Last reviewed: May 2, 2026
How it works
Estimate your biological age based on key health and fitness markers including resting heart rate, VO2 max, BMI, activity level, sleep quality, and stress. Compare your biological age to your chronological age and discover which lifestyle factors are aging you faster — or keeping you young.
How to Use This Calculator
- Enter your chronological age, sex, and key biomarkers (resting HR, BMI, VO2 max, grip strength, etc.).
- Answer lifestyle questions on sleep, diet, and exercise habits.
- Review your estimated biological age and the contributing factors.
- Compare bio age against chronological age to identify gaps.
- Focus improvement efforts on the weakest biomarkers first.
Example
Inputs: 45-year-old with VO2 max 45, resting HR 55, BMI 23, strong grip strength, good sleep.
Result: Estimated biological age of 38 (7 years younger than chronological).
What it means: The combination of high aerobic capacity, low resting heart rate, and healthy body composition suggests a physiological profile typical of someone in their late 30s.
Tips
- VO2 max has the strongest individual correlation with biological age. Improving it by 5-10 ml/kg/min can shift biological age by 5+ years.
- Muscle mass and grip strength are nearly as predictive. A pattern of decline in either is one of the earliest aging signals.
- Sleep under 7 hours regularly adds 2-4 years to biological age through inflammation, cortisol, and insulin resistance.
- Most 'bio age' apps are rough estimates. Focus on improving the underlying biomarkers (VO2 max, grip strength, HR, body composition) rather than chasing the score itself.
- Biological age is modifiable. Consistent exercise, quality sleep, and good nutrition can measurably reduce it within 6-12 months.
Disclaimer: This calculator is for informational and educational purposes only. It is not a substitute for professional medical advice, diagnosis, or treatment. Always consult a qualified healthcare provider.
Learn More
Frequently Asked Questions
- What is biological age and how is it different from chronological age?
- Chronological age is simply how many years you have been alive, while biological age estimates how old your body actually functions based on health markers. Someone who is 45 chronologically could have a biological age of 38 if they are very fit, or 52 if they have poor cardiovascular health. It is a composite score based on metrics like VO2 max, resting heart rate, body composition, and grip strength.
- Can you actually lower your biological age?
- Yes, research consistently shows that regular exercise, quality sleep, a nutritious diet, and stress management can improve the biomarkers that determine biological age. Improvements in cardiovascular fitness and body composition have some of the largest effects. Many people see measurable improvements within 3 to 6 months of consistent lifestyle changes.
- How accurate are online biological age calculators?
- Online calculators provide a useful approximation based on well-studied health markers, but they are not as precise as clinical tests like DNA methylation analysis. They are best used as a motivational tool to track trends over time rather than as a definitive medical assessment. For a clinical-grade result, consult a healthcare provider who offers epigenetic testing.