Biological, heart & metabolic age
The ages you can’t calculate from a date.
EPOCH measures the one age that is exact — the time you have been alive. “Biological age,” “heart age” and “metabolic age” are different ideas, and being honest about them matters: no free tool can truly measure them from a few questions. Here is what each term means and where to get a credible read.
Biological age
Biological age tries to express how old your body “acts” rather than how long it has existed. The most credible estimates come from research-grade methods — DNA-methylation “epigenetic clocks” (such as Horvath’s clock and DunedinPACE) or panels of blood biomarkers. These need laboratory data and validated models, which is exactly why a web page asking your sleep and step count cannot produce a real figure. If you want a serious estimate, that is a conversation with a clinician and a lab, not a free calculator.
Heart age
Heart age recasts your cardiovascular risk as the age of an average person with the same risk — a clever way to make blood pressure and cholesterol feel concrete. The most reputable version is a public-health screening tool rather than a novelty. In the UK, see the NHS Heart Age check; organisations like the American Heart Association publish related risk guidance. Even these are estimates meant to prompt a check-up, not diagnoses.
Metabolic age
“Metabolic age” is a term popularised by bioimpedance body-composition scales. It compares your estimated basal metabolic rate (BMR) with the average BMR for each chronological age and reports the age that matches. It can be a motivating way to track changes in fitness over time, but the underlying BMR estimate is approximate and the comparison is not a recognised clinical measure.
“What age will I die?”
No calculator can predict an individual lifespan. What statisticians can offer is life expectancy — the average remaining years for a large group of the same age and sex — from actuarial life tables such as those published by national statistics offices and the US Social Security actuarial tables. They describe populations, not people, and say nothing about any one person’s future.
The age you can know exactly
Chronological age is the one figure here that is precise, and it is genuinely useful — for forms, eligibility, milestones and curiosity. If that is what you came for, the age calculator gives it to the second, and the chronological age calculator frames it the way assessments expect.
Frequently asked questions
Can a free online calculator measure my biological age?
Not meaningfully. Credible biological-age estimates rely on lab biomarkers or DNA methylation — data a web form does not have. Tools that “calculate” it from a few lifestyle questions are giving a wellness score, not a measurement.
What is the difference between biological and chronological age?
Chronological age is time since birth, fixed by the calendar. Biological age is an estimate of how worn or healthy your body is, which can run ahead of or behind your chronological age. Only the first can be calculated exactly — that is what our age calculator does.
Is “metabolic age” from my smart scale accurate?
Treat it as a rough wellness indicator. It compares your estimated basal metabolic rate against population averages for each age — useful for tracking trends over time, but not a clinical measurement.
Can anything predict what age I will die?
No tool can predict an individual’s lifespan. Actuarial life tables estimate average remaining years for a population of your age and sex — statistics, not a personal forecast.