How to calculate metabolic age?

To calculate metabolic age, first calculate your BMR using the Mifflin-St Jeor formula. Then compare your BMR to the average BMR for each age group. The age group whose average BMR matches yours is your metabolic age.

How is metabolic age calculated on a smart scale?

Smart scales use BIA — a mild electrical current passed through your feet — to estimate lean mass and body fat. From these estimates, the scale calculates your BMR and compares it to age-group averages to produce a metabolic age score.

What is considered a good metabolic age?

A good metabolic age is equal to or lower than your real age. A metabolic age 5+ years below your chronological age indicates strong muscle mass, high activity, and efficient calorie burning.

How can I calculate my body age online?

Enter your gender, age, height, weight, and activity level into our free calculator above. The tool calculates your BMR using the Mifflin-St Jeor formula, compares it to age-group averages, and returns your metabolic age — no email required.

What is the difference between BMR and metabolic age?

BMR (Basal Metabolic Rate) is the number of calories your body burns at rest — it is a calorie number, not an age. Metabolic age is the age group whose average BMR matches your BMR. BMR is the input; metabolic age is the output.

Is metabolic age the same as biological age?

No. Metabolic age reflects calorie-burning efficiency. Biological age reflects cellular aging — DNA methylation, telomere length, and organ function. Both can differ from your chronological age, but they measure different things.

Can I improve my metabolic age naturally?

Yes. Resistance training, high-protein diet, quality sleep, and HIIT are the 4 most effective methods. Most people see a measurable improvement in metabolic age within 90 days.

What is a normal metabolic age for a 40-year-old woman?

A normal metabolic age for a 40-year-old woman is 38–42. A metabolic age below 35 indicates above-average metabolic health. A metabolic age above 48 signals a need for diet and exercise changes.

Why is my metabolic age higher than my real age?

A metabolic age above your real age means your BMR is lower than average for your age group. The 4 most common causes are low muscle mass, a sedentary lifestyle, chronic sleep deprivation, and a high-calorie processed diet.

Is a free metabolic age calculator accurate?

A free calculator using the Mifflin-St Jeor formula is accurate within ±5–8%. It is less precise than a DEXA scan but more accessible and useful for tracking progress over time. Accuracy improves if you include body fat percentage in the inputs.

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Intermittent Fasting and Metabolic Age: Does Fasting Help or Hurt Your BMR? (2026)
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Metabolic Age and Menopause: Why Your Metabolism Slows After 40 in 2026
Metabolic Age by Decade: What's Normal in Your 20s, 30s, 40s, 50s, and 60s+ (2026)
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Muscle Mass and Metabolic Age: The 2026 Sarcopenia Prevention Guide
TDEE vs BMR: What’s the Difference and Which Number Should You Track? (2026)
BIA vs DEXA vs Online Calculator: Which Metabolic Age Test Wins in 2026?

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