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Free health tool

Biological age calculator

Enter your age and nine blood markers. Get the same blood-based PhenoAge estimate used by LongevityMate.

Educational estimate. Qualified clinical review has not been performed. Do not use this result to diagnose a condition or choose treatment.

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Calculator measurements

All nine blood markers are required. Use one recent panel; an estimate is not your literal body age.

years

Age in completed years.

Serum albumin from your blood report.

Serum or plasma creatinine, not a urine result.

Use the measured blood glucose, not HbA1c or estimated average glucose.

An exact measured value. Do not replace a result such as <0.3 with 0.3 or zero.

%

The percentage, not the absolute lymphocyte count.

fL

Mean corpuscular volume.

%

Use RDW-CV in percent. RDW-SD in fL is a different measurement.

U/L

Alkaline phosphatase.

Total WBC or WCC, not a differential cell count.

Your result will appear here

Enter your measurements above, or try the worked example. Entry limits are not healthy reference ranges.

Inputs and results stay in this page's memory. They are not saved, uploaded or added to links. Changing units clears that value.

Conceptual illustration of a blood specimen beside an orange ring of abstract blood marker tokens; this is not a DNA test.

What this result means

This calculator estimates clinical PhenoAge from your chronological age and nine blood measurements. It expresses a statistical risk profile as an age. It does not measure every aspect of ageing or prove that your body has become younger. [1]

Which blood markers do I need?

Albumin, creatinine, glucose, CRP or hs-CRP, lymphocyte percentage, MCV, RDW-CV, alkaline phosphatase and total white blood cell count. These are distinct measurements. HbA1c cannot replace glucose, and an absolute lymphocyte count cannot replace the percentage. [1]

Get the units right

Choose the unit printed beside each result. Albumin supports g/L and g/dL, creatinine supports µmol/L and mg/dL, glucose supports mmol/L and mg/dL, and CRP supports mg/L and mg/dL. WBC can be entered as 10⁹/L, 10³/µL or cells/µL. The model itself uses CRP in mg/dL, so a factor-of-ten mistake can materially change the answer. [1][2]

Use the number as a conversation starter

Keep the original report and look at each measurement in its own clinical context. A single combined number can hide meaningful abnormalities. LongevityMate can help organise the wider blood results and changes over time; clinical decisions still require appropriate professional care.

Can I calculate biological age without all nine markers?

This PhenoAge method requires all nine. The calculator will not invent missing results, substitute an average, or silently switch to a different ageing model. Check whether your existing blood report includes a full blood count and CRP. [1]

How accurate is a biological age calculator?

The published model was developed and validated as a population-level risk measure. That does not make an individual result a direct measurement of biological age, a lifespan forecast or a proven response to an intervention. Different ageing models answer different questions. [1]

Is PhenoAge the same as an epigenetic age test?

No. This tool uses routine clinical blood measurements. DNAm PhenoAge estimates a related ageing measure from DNA methylation data. A blood-based result is not a DNA test, even when a blood sample is used for both. [1]

Why is my result different from another PhenoAge calculator?

Check the marker variants, CRP unit, WBC scale, conversion factors and calculation version. The original denominator is 0.090165; the model maintainers restored it after an author clarification. This page imports LongevityMate's shared calculation instead of maintaining a second formula. [2]

How often should I repeat it?

There is no validated retest interval that applies to everyone. Follow the timing appropriate to your health and the underlying blood tests. For comparison, use a similar sampling context and the same model; a short-term change may reflect illness or ordinary variation.

Are my blood results saved or sent to AI?

No. The calculation runs locally. Entries and results remain in this page's memory and are cleared when you reload or clear the form. They are not included in links, analytics or AI requests.

Formula and assumptions

Formula
Nine canonical-unit biomarkers + chronological age → shared LongevityMate clinical PhenoAge implementation. CRP uses ln(mg/dL); the original age transform denominator is 0.090165. [1][2]
Version
Clinical PhenoAge: original Levine/BioAge model, clinical-phenoage-original.2026-09-05.2
Rounding
The shared app calculation rounds the final age once to one decimal. Inputs are not rounded before calculation.
Worked example
Synthetic example: age 35; albumin 43 g/L, creatinine 85 µmol/L, glucose 5.2 mmol/L, CRP 0.9 mg/L, lymphocytes 30%, MCV 89 fL, RDW-CV 13%, ALP 65 U/L and WBC 5.8 × 10⁹/L. The shared model gives PhenoAge 29.5 years, a difference of −5.5 years. This is a formula example, not a healthy target. [1][2]

Who this is for — and when not to use it

Intended use

Educational calculation of the same clinical PhenoAge used by LongevityMate, from a complete, recent, comparable adult blood panel.

Not intended for

Diagnosis, lifespan prediction, treatment decisions, proof of rejuvenation, or an epigenetic/DNA methylation age test.

Exclusions

  • Missing markers or measurements from different dates.
  • CRP or other results reported only as < or > a limit.
  • Urine creatinine; absolute lymphocyte count; RDW-SD in fL.
  • Acute illness, pregnancy or a condition that needs individual clinical interpretation.

Evidence sources

  1. 1. An epigenetic biomarker of aging for lifespan and healthspan — Levine et al., Aging. Accessed Oct 4, 2026.
  2. 2. Restore the original Levine PhenoAge constant to 0.090165 — BioAge model maintainers. Accessed Oct 4, 2026.