Estimate metabolic age from body and energy markers. Compare BMR, activity, and trends. Track progress using practical health metrics.
The chart compares your estimated resting calorie burn with expected values across ages using your current body size.
| Profile | Sex | Age | Height (cm) | Weight (kg) | Body Fat % | Activity | Estimated Metabolic Age |
|---|---|---|---|---|---|---|---|
| Example A | Male | 34 | 178 | 78 | 18 | 1.55 | 31.8 years |
| Example B | Female | 42 | 165 | 70 | 30 | 1.375 | 46.4 years |
| Example C | Male | 50 | 172 | 84 | 25 | 1.2 | 54.1 years |
1) Basal Metabolic Rate: The calculator uses Mifflin-St Jeor when body fat is not supplied. If body fat is entered, it uses Katch-McArdle with lean body mass.
Mifflin-St Jeor:
Male BMR = (10 × weight) + (6.25 × height) − (5 × age) + 5
Female BMR = (10 × weight) + (6.25 × height) − (5 × age) − 161
Katch-McArdle:
Lean Mass = weight × (1 − body fat / 100)
BMR = 370 + (21.6 × lean mass)
2) Metabolic Age: Metabolic age is estimated by solving the resting energy equation for age after calculating your BMR.
3) TDEE: Total Daily Energy Expenditure = BMR × activity factor.
4) Goal Calories: Daily goal calories adjust maintenance calories using an energy balance estimate of about 7700 kcal per kilogram.
Metabolic age compares your estimated resting calorie burn with typical values associated with age. It is an interpretive wellness metric, not a formal diagnosis.
No. Chronological age is how many years you have lived. Metabolic age is an estimate based on energy expenditure and body composition patterns.
Body fat helps estimate lean mass. Lean tissue burns more calories at rest, so adding body fat can improve the BMR estimate used for metabolic age.
Regular exercise can improve body composition, cardiovascular fitness, and resting energy efficiency. Over time, these changes may improve your metabolic age estimate.
The calculator uses established equations, not direct lab measurements. True metabolic assessment may require indirect calorimetry, body composition testing, and clinical review.
An older estimate may reflect lower lean mass, lower activity, or higher body fat. It can guide habits, but it should not be viewed as a medical diagnosis.
Pick the level that matches your usual weekly movement, not your best day. Overstating activity can inflate TDEE and calorie guidance.
No. Use it for education and planning only. Speak with a qualified clinician or dietitian for diagnosis, treatment, or personalized medical advice.
Important Note: All the Calculators listed in this site are for educational purpose only and we do not guarentee the accuracy of results. Please do consult with other sources as well.