Metabolic Age Calculator

How the Metabolic Age Calculator Works

Your metabolic age reflects how efficiently your body burns calories compared to the average metabolism of people in different age groups. Unlike chronological age, which simply counts the years you have been alive, metabolic age is based on your Basal Metabolic Rate (BMR), which is the amount of energy your body needs to function at rest. People with higher muscle mass, healthier metabolic activity, and active lifestyles often have a metabolic age younger than their actual age. Those with slower metabolisms may have a metabolic age older than their chronological age.

This calculator uses the Mifflin-St Jeor equation, a clinically accepted formula for estimating BMR with high accuracy. By combining your age, weight, height, and gender, the calculator estimates your daily baseline energy requirement. It then compares this value with the expected BMR of a healthy 20-year-old of similar body size, providing an estimated metabolic age. This comparison is widely used in fitness assessments, wellness tracking, and metabolic testing.

While metabolic age is not a medical measurement, it provides helpful insight into your overall metabolic health. Improving your metabolic age typically involves lifestyle changes such as resistance training to build muscle, regular aerobic exercise, better sleep habits, balanced nutrition, and maintaining a healthy body composition. Many people use metabolic age to monitor long-term fitness progress, evaluate dietary effectiveness, or understand how aging may influence their metabolism.

All calculations take place directly in your browser, and no data is saved or transmitted. This tool serves as a simple, accessible way to estimate metabolic performance and track general wellness over time.

Frequently Asked Questions