Metabolic Age Calculator
Compare your BMR to age norms.
Enter your values
Enter the weight in kg.
Enter the height in cm.
Enter the age in years.
Choose one of: Male, Female.
Results update instantly as you type — no submit needed. Your values are remembered on this device, and the shareable link reopens the calculator with exactly these numbers.
- Metabolic age
- 40 years
- Your BMR
- 1,698 kcal/day
- Chronological age
- 40 years
- Difference
- 0 years
- BMR per kg
- 21.76
Quick answer
Metabolic age compares your BMR to the average for different ages — a lower number suggests better metabolic fitness.
At a glance
| What it does | Compare your BMR to age norms. |
|---|---|
| Category | Health |
| Inputs needed | Weight, Height, Age, Sex |
| Main output | Metabolic age |
| Cost | Free — no sign-up, no download |
How to use the Metabolic Age Calculator
- 1Enter weight, height and age.
- 2Select your sex.
- 3Compare metabolic age to your actual age.
Inputs explained
- Weight(kg)
- Enter the weight in kg.
- Height(cm)
- Enter the height in cm.
- Age(years)
- Enter the age in years.
- Sex
- Choose one of: Male, Female.
Worked example
Using the values the calculator loads with:
Inputs
- Weight78 kg
- Height178 cm
- Age40 years
- SexMale
Results
- Metabolic age40 years
- Your BMR1,698 kcal/day
- Chronological age40 years
- Difference0 years
- BMR per kg21.76
Frequently asked questions
How do I lower metabolic age?
Build muscle and reduce fat mass — lean tissue burns more at rest.
Is this scientific?
It is a popular fitness metric, not a clinical measure.
What do I need to enter into the Metabolic Age Calculator?
Just 4 values: weight, height, age, sex. Every field starts with a realistic example, so you can change one number at a time and watch the result update instantly.
How does the Metabolic Age Calculator work out the answer?
Metabolic age compares your BMR to the average for different ages — a lower number suggests better metabolic fitness. The working is shown step by step so you can verify the result by hand.
Is the Metabolic Age Calculator free, and do I need an account?
It is completely free with no sign-up, no download and no usage limit. Everything is calculated in your browser, so the numbers you type never leave your device.
Results are estimates for general information. For medical, legal, structural or financial decisions, confirm with a qualified professional.