Biological Age Calculator
Estimate a modifiable-risk-factor age offset from lifestyle and clinical inputs — a structured summary of what you can change, not a measurement of biological ageing.
Formula & Reference
| Variable | Symbol | Formula | Units |
|---|---|---|---|
| Biological Age Calculator | — | Offset = sum of weighted modifiable factors applied to chronological age | years |
Step-by-Step Examples
45 years, RHR 54, never smoked, 6 h weekly exercise, whole-food diet, 8 h sleep, minimal alcohol, BP 115/72, healthy weight, strong social ties, no conditions.
- RHR under 55 → −1
- Exercise −3, diet −2, sleep −1, BP −1, composition −1, social −2
- Raw offset = −11, scaled by 45/50 = 0.9
- Adjusted offset ≈ −9.9 years
52 years, RHR 70, former smoker (quit 12 years), 2 h exercise, mixed diet, 7 h sleep, moderate alcohol, BP 128, slightly overweight, adequate social contact, one managed condition.
- RHR 70 → +1
- Smoking +2, exercise 0, diet 0, sleep −1, alcohol +1, BP 0, composition 0, social 0, chronic +2
- Raw offset = +5, scaled by 1.04
- Adjusted offset ≈ +5.2 years
58 years, RHR 88, current smoker, under 1 h exercise, processed diet, 5 h sleep, heavy alcohol, treated hypertension, obese, socially isolated, multiple conditions.
- RHR 88 → +3
- Smoking +9, exercise +3, diet +2, sleep +3, alcohol +3, BP +4, composition +2, social +3, chronic +5
- Raw offset = +37, scaled by 1.16
- Adjusted offset ≈ +42.9 years — a figure this large shows the model's limits
Real-World Applications
Common Mistakes to Avoid
There is no validated consumer formula for biological age. Real measures — epigenetic clocks such as DunedinPACE, telomere length, proteomic ageing markers — require laboratory analysis. This tool weights modifiable risk factors, which is a different thing entirely.
Every online biological age tool uses its own invented weighting. Two calculators will give different answers for the same person, because none is measuring an underlying quantity.
Genetics, environmental exposures, and chance all affect health outcomes and are not captured here. A favourable profile improves odds; it does not determine outcomes.