Curious how your metabolism compares to your actual age?
Our free Metabolic Age Calculator estimates your metabolic age using your BMR, fitness level, and body composition — helping you understand your body’s true efficiency and energy use.
Metabolic Age Calculator
Find your metabolic age instantly.
Enter your age, height, weight, waist, and resting heart rate — and get your metabolic age, BMR, and wellness score (0–100).
How It Works
Your metabolic age reflects how efficiently your body burns energy compared to your actual age.
The calculator combines these elements:
- Basal Metabolic Rate (BMR) via Mifflin–St Jeor Equation
BMR = 10 × weight + 6.25 × height − 5 × age + s - Waist-to-Height Ratio (WHtR) – for fat distribution
- Resting Heart Rate (RHR) – for cardiovascular fitness
- VO₂max and Body Fat % (optional) – for deeper accuracy
- Activity Level – adds a positive adjustment
Then, your score (0–100) is calculated, and metabolic age estimated as:
MetAge = Age + (50 − Score) / 5
Why Use This Calculator
✔ Calculates BMR, metabolic age, and fitness score
✔ Works with optional VO₂max and body fat inputs
✔ Responsive, mobile-friendly, and educational
✔ No signup or tracking — instant results
✔ Perfect for health, fitness, and wellness websites
Example Calculation
- Age: 30 years
- Sex: Male
- Height: 175 cm
- Weight: 75 kg
- Resting HR: 65 bpm
- Waist: 82 cm
- Activity: Moderate
➡ BMR = 1 731 kcal/day
➡ Score = 85 / 100
➡ Metabolic Age = 27 years
Your body performs like a younger person’s metabolism — great job!
FAQ
Q: What does metabolic age mean?
A: It compares your body’s metabolic efficiency to your actual age — lower is better.
Q: Is this calculator medical advice?
A: No, it’s an educational estimate only.
Q: How can I improve my metabolic age?
A: Exercise regularly, increase muscle mass, and maintain balanced nutrition.
Q: Is it normal if my metabolic age is higher?
A: Yes — it’s just an indicator, not a diagnosis. Lifestyle improvements can lower it over time.