Metabolic Age Calculator

Understanding Your Metabolic Age and BMR

The **Metabolic Age Calculator** is a health metric that compares your Basal Metabolic Rate (**BMR**) to the average **BMR** of other people in your chronological age group. Your **BMR** is the number of calories your body burns at rest. If your calculated **metabolic age** is lower than your actual age, it suggests you have a **fast metabolism**, likely due to a higher ratio of muscle to fat. This indicates positive metabolic health and efficient calorie processing.

Calculating BMR (Mifflin-St Jeor)

The calculation first determines your **BMR** using the widely accepted Mifflin-St Jeor formula: $$\text{BMR} = 10 \times \text{weight (kg)} + 6.25 \times \text{height (cm)} - 5 \times \text{age (y)} + \text{s}$$ where $s$ is $+5$ for men and $-161$ for women. This resulting **Basal Metabolic Rate** is the foundation of your **metabolic age** estimate.

Metabolic Age Interpretation

The **metabolic age** is determined by finding the age group whose average **BMR** matches your calculated **BMR**. Key interpretations are:

• **Younger:** Your **metabolic age** is lower than your chronological age, indicating a healthy muscle mass and **fast metabolism**.
• **Same:** Your metabolism is typical for your age group.
• **Older:** Your **metabolic age** is higher, often indicating a lower muscle-to-fat ratio and a **slow metabolism**. This suggests potential areas for fitness improvement.

Improving your **metabolic health** typically involves increasing muscle mass through resistance training, which naturally raises your **BMR** and lowers your **metabolic age**.