Biological / Functional Age Calculator

Estimate how “old” your body acts compared to your calendar age using simple strength, mobility, and cardio markers.

Basic Info

Age (years)

Sex

Bodyweight (same units as grip)

Use pounds or kilograms. Just use the same units for bodyweight and grip strength.

Resting Heart Rate (beats per minute)

Take this seated, after resting a few minutes.

Cardiovascular Fitness

VO₂max (ml/kg/min) – optional

Use your lab test, wearables estimate, or leave blank if you don’t know.

Weekly Moderate-to-Vigorous Activity

Brisk walking, cycling, running, exercise classes, etc.

Strength & Power

Grip Strength (best hand, same units as bodyweight)

Dynamometer preferred. Use pounds or kilograms; just match bodyweight units. Leave blank if unknown.

5× Sit-to-Stand (seconds)

From a standard chair, arms crossed if possible. Time 5 full stands and sits.

Heaviest Comfortable Floor Lift

Pick the option that best matches you right now.

Floor-to-Stand Ability

From the floor (lying or sitting on the ground) back up to standing.

Balance & Mobility

Single-Leg Balance (best side, seconds)

Stand on one leg, eyes open, stop timing when you touch down or grab support (max 60s).

Stair Ability

Think of a typical indoor flight (10–14 steps).

Body Composition & Metabolic Health

Height (cm or inches)

Use centimeters or inches; just match waist units.

Waist Circumference (same units as height)

Measure at the level of the belly button, relaxed.

Metabolic Conditions Diagnosed

High blood pressure, high cholesterol, type 2 diabetes, sleep apnea, heart disease, etc.