Biological Age Calculator
Estimate your biological age from longevity markers like resting heart rate, sleep, and waist-to-hip ratio.
Precision Fitness Calculators
Estimate your biological age from longevity markers like resting heart rate, sleep, and waist-to-hip ratio.
years
bpm
Measure first thing in the morning
hrs/night
Typical nightly sleep duration
cm
At the navel level
cm
At the widest point
hrs/week
Moderate or vigorous activity (walking counts at a brisk pace)
Scientific Reference
This calculator estimates biological age by adjusting your chronological age using four lifestyle markers, each independently linked to all-cause mortality in large cohort studies. It is a lifestyle approximation, not a clinical biomarker test.
The Markers
- Resting Heart Rate: In the Copenhagen Male Study, a resting heart rate above 80 bpm was associated with a 45% higher mortality risk versus 51–80 bpm, independent of fitness level.
- Sleep Duration: A meta-analysis of 16 prospective studies found both short (<6h) and long sleep predict higher mortality; ~7–8 hours is the low-risk zone.
- Waist-to-Hip Ratio: WHO defines abdominal obesity as WHR > 0.90 (men) or > 0.85 (women) — a stronger cardiovascular risk marker than BMI in many studies.
- Physical Activity: Meeting the WHO guideline of 150–300 minutes of moderate activity per week is associated with a ~31% lower mortality risk versus none.
Sources: Resting Heart Rate & Mortality (PubMed) · Sleep Duration Meta-Analysis (PubMed) · Leisure-Time Activity & Mortality (PubMed) · WHO Waist-Hip Ratio Report
Chronological age vs biological age
Two people born the same year can carry very different bodies. Biological age is the concept that your physiology — cardiovascular efficiency, metabolic health, recovery capacity — can run older or younger than your birth certificate, and large cohort studies show simple lifestyle markers predict mortality risk independent of calendar age.
This calculator adjusts your chronological age using four such markers. Resting heart rate: in the Copenhagen Male Study, an RHR above 80 bpm carried a 45% higher mortality risk than 51–80 bpm, independent of fitness. Sleep: meta-analysis of 16 prospective studies shows both short (under 6 hours) and long sleep predict higher mortality, with 7–8.5 hours the low-risk zone. Waist-to-hip ratio: the WHO flags abdominal obesity above 0.90 for men and 0.85 for women as a cardiovascular risk marker stronger than BMI. Exercise: meeting the 150–300 weekly minutes guideline associates with roughly 31% lower mortality versus none.
Reading — and improving — your result
The per-factor breakdown is the useful part: it shows exactly which marker adds years and which subtracts them, so your result arrives with its own action list. A high RHR responds to consistent zone 2 cardio within weeks. Sleep duration is a schedule decision. Waist-to-hip ratio moves with a sustained calorie deficit — pair it with the TDEE calculator.
Be clear about what this is: a lifestyle approximation, not a clinical biomarker panel. Epigenetic clocks and blood-marker models measure aging more directly; this tool measures the levers you can actually pull this month. Re-test quarterly — watching a marker move from the penalty zone into the reward zone is one of the most motivating signals in fitness.
The four markers are not independent, which works in your favour. Sleep improves recovery, which makes training consistent; consistent training lowers resting heart rate; regular exercise and better sleep both improve appetite regulation, which shrinks the waistline. Fixing the worst marker often pulls the other three along with it, so there is no need to attack all four at once. Start with whichever line in your breakdown carries the biggest penalty, give it eight weeks of genuine attention, then re-measure. Save each result to the progress tracker so the trend is visible — biological age is a slow-moving number, and the quarterly comparison is where the change actually shows.
Frequently Asked Questions
Can I reverse my biological age?
You can move every marker this calculator uses. Regular cardio lowers resting heart rate within 4–8 weeks, a calorie deficit shrinks waist-to-hip ratio, and sleep duration changes the night you decide it does. People routinely shift their estimate by several years in a few months.
How is this different from an epigenetic age test?
Epigenetic clocks read DNA methylation from a blood or saliva sample and measure cellular aging directly. This calculator approximates the same idea from lifestyle markers — less precise, but free, instant, and built entirely from factors you can change.
What is a good resting heart rate for my age?
For adults, 60–80 bpm is typical and below 60 is common in trained people. The mortality data flags sustained rates above 80 bpm as the risk zone. Measure first thing in the morning, before coffee, ideally averaged over several days.
Why does the calculator use waist-to-hip ratio instead of weight?
Because fat location matters more than fat amount. Visceral (abdominal) fat drives insulin resistance and cardiovascular risk, and waist-to-hip ratio captures it better than weight or BMI — particularly for South Asians, who accumulate visceral fat at lower body weights.