Metabolic Age Calculator

Metabolic age compares your BMR to the average for your chronological age. A lower metabolic age (higher BMR than peers) reflects better muscle mass and metabolic health

The calculator uses the standard published formula for metabolic age calc. Results are accurate to the precision of the inputs you provide. For financial, medical, or legal decisions, always verify with a qualified professional.

This calculator works with inches. You can enter values in the units shown — the calculator handles all conversions internally.

The core formula is: BMR = 88.4 + 13.4*weight + 4.8*height - 5.68*age (Mifflin-St Jeor, male). Each step in the calculation is shown so you can verify the result manually.