Power Calculators

🧬 Biological Age Calculator: How Old Is Your Body?

Two people born the same year can age very differently. Estimate the age your body is behaving like.

By the Power Calculators team Updated

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Enter details

In cm, or feet.inches like 5.7 for 5 ft 7 in when you choose feet.
Measure at the navel.
Count your pulse for a minute after sitting quietly.

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Fill in the details and click Calculate to see your results.

Formula at a glance

Biological Age Calculator: Biological age — Real age + ln(combined risk ratio) ÷ 0.085. Example: Active 40-year-old non-smoker → Your biological age (estimate): 33.6 years
How the Biological Age Calculator works: Biological age — Real age + ln(combined risk ratio) ÷ 0.085

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📘 About the Biological Age Calculator

Your biological age reflects how your body is ageing compared with the average person of your age. Doctors and researchers measure it with blood tests and DNA 'clocks', but your habits and simple measures such as resting pulse and waist size explain a lot of the difference.

This calculator turns each factor's effect on health risk into years: because the risk of dying roughly doubles every 8 years of age, a habit that raises your risk by 30% adds about 3 years to your biological age, and one that lowers it takes years off.

🧮 Formula

Biological age
Real age + ln(combined risk ratio) ÷ 0.085

Where

  • 0.085 = yearly increase in the risk of dying (it doubles about every 8 years)

✏️ Worked examples

Active 40-year-old non-smoker

You enter
Your real age40 years
SexMale
Height175
Height incm
Your weight70 kg
Weight inkg
Waist80 cm
Resting heart rate58 beats a minute
SmokingNever smoked
Exercise150–300 minutes a week
AlcoholNone
DietFruit, vegetables, pulses and whole grains daily
Sleep6–9 hours
Blood pressureNormal
DiabetesNo
Contact with friends & familyOften — strong support
You get
Your biological age (estimate)33.6 years
Your real age40 years
Difference−6.4 years — your body is younger than your age 🎉
Health risk vs an average person your age0.58×
BMI22.9

Biological age 33.6 years.

Inactive 40-year-old smoker

You enter
Your real age40 years
SexMale
Height175
Height incm
Your weight88 kg
Weight inkg
Waist102 cm
Resting heart rate84 beats a minute
SmokingSmoke 10 or more a day
ExerciseAlmost none
Alcohol8–21 drinks a week
DietLots of fried, sugary or processed food
SleepUnder 6 hours
Blood pressureHigh and not controlled / never checked
DiabetesNo
Contact with friends & familySometimes
You get
Your biological age (estimate)60 years
Your real age40 years
Difference+20 years — your body is ageing faster than your age
Health risk vs an average person your age6×
BMI28.7

60 years.

🧭 How to use this calculator

What you enter

  • Your real age (years)
  • Sex
  • HeightIn cm, or feet.inches like 5.7 for 5 ft 7 in when you choose feet.
  • Height in
  • Your weight (kg)
  • Weight in
  • Waist (cm)Measure at the navel.
  • Resting heart rate (beats a minute)Count your pulse for a minute after sitting quietly.
  • Smoking
  • Exercise
  • Alcohol
  • Diet
  • Sleep
  • Blood pressure
  • Diabetes
  • Contact with friends & family

What you get

  • Your biological age (estimate)
  • Your real age
  • Difference
  • Health risk vs an average person your age
  • BMI

💡 Turn back your body clock

  • Cardio 150+ minutes a week and strength training twice a week.
  • 7–8 hours of regular sleep.
  • Mostly plants, pulses and whole grains; less sugar and ultra-processed food.
  • No tobacco; little or no alcohol.

❓ Frequently asked questions

What is biological age?

An estimate of how old your body is functionally, based on health markers, as opposed to your age in years (chronological age).

Can I lower my biological age?

Yes. Studies show that exercise, quitting smoking, losing excess weight, better sleep and diet improve the markers used to measure biological age.

Is a resting heart rate of 80 bad?

It is within the normal range (60–100), but people with a resting pulse below 60–70 tend to be fitter and at lower risk; regular cardio lowers it.

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