Biological Age Calculator

How This Biological Age Calculator Works

This biological age calculator uses Phenotypic Age (PhenoAge), a measure published in 2018 by Morgan Levine and colleagues at Yale. The researchers studied blood test results and long-term health records from thousands of adults in the US National Health and Nutrition Examination Survey (NHANES), and found the combination of nine biomarkers plus age that best predicted risk of death and age-related disease.

The calculator turns your results into a mortality risk score, then converts that score into the age at which an average person has the same risk. That age is your PhenoAge. If it is lower than your chronological age, your blood markers look younger than average for your age; if it is higher, they look older.

The 9 Blood Test Markers

Most of these come from two routine tests your doctor may already order. CRP is often a separate test, so check your report or ask for it.

How to Calculate Biological Age

1. Get a recent blood test. If you are learning how to calculate biological age for the first time, ask your doctor for a panel that includes all nine markers, ideally taken when you are well and fasting.
2. Enter the values and your current age in the calculator above, checking the units.
3. Compare your biological age with your chronological age. Find your exact age with our chronological age calculator if needed.

Behind the scenes, the formula weights each marker, adds them into one score, estimates 10-year mortality risk and converts that risk into an age. You do not need to do the math by hand; the free biological age calculator above does it instantly.

Biological Age Test Options

If you are wondering which biological age test to choose, it helps to know there are four main types. A biological age blood test like the one above is the easiest to start with, because the results often come from blood work you already have.

• Blood test calculators like this one: free if you already have the results, based on a published, peer-reviewed formula.
• Epigenetic (DNA methylation) tests: at-home kits that analyze chemical changes on your DNA. They are more specialized and cost money, and results can vary between companies.
• Online questionnaires: quick self-assessment quizzes about lifestyle. They are easy but much less precise.
• Physical measures: grip strength, walking speed and body composition also track aging and are used in some research.

For more on what these measures mean, read chronological age vs biological age.

Example Result

Press Try sample values in the calculator to see a worked example. A 50-year-old with healthy values (albumin 4.5 g/dL, glucose 90 mg/dL, CRP 1 mg/L, RDW 13% and others in the normal range) gets a PhenoAge of about 43.5, around six and a half years younger than their real age. The same person with raised glucose, CRP and RDW would score well above 50. This is why a free biological age test online, based on real blood values, can be a useful nudge to look after your health.

How Accurate Is This Biological Age Test?

PhenoAge is one of the best-studied blood-based measures, but it is still an estimate. A cold, infection or recent hard exercise can raise CRP and white blood cells and push the result up for a short time. Lab methods also differ slightly. Use the number to track change over time with repeat tests, not as a single verdict, and never to diagnose a condition.

Can You Lower Your Biological Age?

The markers in this calculator respond to lifestyle. Regular physical activity, a balanced diet, healthy body fat levels, good sleep, not smoking and managing blood pressure and blood sugar are all linked with healthier values. Some people see their result improve after months of consistent change, though research on reversing aging is still early. Talk to your doctor before making major changes.

This tool is for general information only and is not medical advice. Results do not replace a consultation with a healthcare professional.

Biological Age Calculator FAQs