Free Metabolic Age Calculator
See how your metabolism compares to your actual age. Enter your details below to get an instant estimate based on your basal metabolic rate.
Estimate Your Metabolic Age
Enter your gender, age, height, and weight to see your estimated basal metabolic rate and how it compares to typical values for your age.
Understanding Metabolic Age
What the number actually means
Basal Metabolic Rate (BMR)
Your BMR is an estimate of how many calories your body needs at complete rest just to maintain basic functions like breathing, circulation, and cell production.
Comparing to Age Averages
Metabolic age takes your calculated BMR and compares it against typical average BMR figures for different age groups of the same gender, to estimate an “equivalent” age.
Younger vs Older Metabolic Age
A metabolic age lower than your actual age suggests your BMR is closer to that of a younger person, often associated with higher muscle mass or general activity levels.
What Influences It
Muscle mass, activity levels, genetics, and age all play a role in metabolic rate. Muscle tissue burns more calories at rest than fat tissue, which is one reason strength training is often linked to a lower metabolic age.
Metabolic Age Calculator
Enter your details to see your estimate
Supporting a Healthy Metabolism
Metabolic rate is influenced by many factors, several of which respond well to consistent, healthy lifestyle habits over time.
Build and Maintain Muscle
Regular strength or resistance training helps build muscle mass, which burns more energy at rest than fat tissue, supporting a healthier resting metabolic rate over time.
Stay Consistently Active
Regular movement throughout the day, not just structured workouts, contributes to overall energy expenditure and general metabolic health.
Prioritise Sleep
Poor sleep has been linked with changes in hormones that regulate appetite and energy use, so consistent, quality sleep supports overall metabolic wellbeing.
Speak to a Professional for Personalised Advice
A doctor, dietitian, or qualified personal trainer can assess your individual circumstances and provide tailored, evidence-based guidance suited to your health and goals.
Typical BMR by Age Group
Approximate average basal metabolic rates used as reference points in metabolic age estimates. Individual results vary considerably based on body composition.
| Age Group | Approx. Male BMR | Approx. Female BMR |
|---|---|---|
| 20–29 | ~1,740 kcal/day | ~1,400 kcal/day |
| 30–39 | ~1,700 kcal/day | ~1,370 kcal/day |
| 40–49 | ~1,660 kcal/day | ~1,340 kcal/day |
| 50–59 | ~1,620 kcal/day | ~1,310 kcal/day |
| 60–69 | ~1,580 kcal/day | ~1,280 kcal/day |
| Note | Figures are population averages for reference only, not individual targets. | |
Metabolic Age FAQ
Answers to the most frequently asked questions about metabolic age and how it’s estimated.
Metabolic age compares your basal metabolic rate (BMR), the number of calories your body burns at rest, to the average BMR of people at different ages. If your metabolic age is lower than your actual age, your metabolism is estimated to be working at a rate typical of a younger person.
Metabolic age is usually estimated by first calculating your basal metabolic rate using a formula such as the Mifflin-St Jeor equation, based on your height, weight, age, and gender, and then comparing that figure to typical average BMR values for different age groups.
No, metabolic age is not a formal clinical diagnosis. It is a popular fitness concept used to help people think about their overall metabolic health in a simple, relatable way, rather than a precise medical measurement.
Regular strength training, staying physically active, getting adequate sleep, and maintaining a balanced diet can all support a healthy metabolism over time. Muscle mass in particular tends to increase resting energy expenditure compared with fat mass.