Average BMR by Height, Weight and Age for US Adults

Basal Metabolic Rate (BMR) and Total Daily Energy Expenditure (TDEE) are fundamental metrics for understanding daily caloric needs. The 2026 WHO standards provide the most accurate formulas to date, incorporating age, gender, height, weight, and activity level variables specific to American adult populations.

BMR represents the energy required to maintain basic bodily functions at rest—breathing, circulation, cell production, and brain activity. TDEE extends this to include all daily energy expenditure: physical activity, food digestion, and thermal regulation.

• Sedentary (little to no exercise): TDEE = BMR × 1.2
• Lightly active (1-3 days/week): TDEE = BMR × 1.375
• Moderately active (3-5 days/week): TDEE = BMR × 1.55
• Very active (6-7 days/week): TDEE = BMR × 1.725
• Extremely active (physical job + training): TDEE = BMR × 1.9

The 2026 metabolic calculation standards incorporate new NHANES data showing a 3-5% decline in average BMR among American adults compared to 2020 data, primarily due to increased sedentary behavior. The updated formulas now include correction factors for office workers, recognizing that prolonged sitting reduces resting metabolic rate.

Additionally, the WHO has introduced gender-specific adjustments that account for differences in body composition—women typically have 5-10% lower BMR than men of the same weight and height due to differences in muscle mass distribution.

Understanding personal BMR and TDEE enables precise calorie planning for weight management goals. For fat loss, a moderate calorie deficit of 15-20% below TDEE is recommended by the CDC, minimizing muscle loss while promoting fat reduction. For muscle gain, a 10-15% surplus supports lean tissue accretion without excessive fat storage.

Regular TDEE recalculation every 2-3 months, or following significant weight changes, ensures ongoing accuracy as body composition evolves.