What is BMR and what factors influence it?

BMR (Basal Metabolic Rate) represents the minimum number of calories your body needs to maintain basic life-sustaining functions at rest, such as breathing, circulation, cell production, and temperature regulation. Key factors include age, biological sex, genetics, hormone levels, and body composition. Muscle tissue is more metabolically active than fat tissue, meaning individuals with higher muscle mass naturally have a higher BMR.

What is TDEE and how is it composed?

TDEE (Total Daily Energy Expenditure) is the total amount of energy you burn in a 24-hour period. It is composed of four main components: Basal Metabolic Rate (BMR), Non-Exercise Activity Thermogenesis (NEAT, such as walking, fidgeting, and standing), Exercise Activity Thermogenesis (EAT), and the Thermic Effect of Food (TEF, which is the energy required to digest and process nutrients).

Which BMR formula is the most accurate?

This calculator utilizes the Mifflin-St Jeor equation, widely recognized by the Academy of Nutrition and Dietetics as the most accurate estimation for the general population. For athletes or individuals with precise knowledge of their body composition, the Katch-McArdle formula may be preferred, as it calculates metabolic rate directly from lean body mass rather than total body weight.

How do I accurately estimate my physical activity multiplier?

Overestimating activity levels is a common pitfall. Select "Sedentary" (1.2) if you have an office job and perform minimal movement. Choose "Light" (1.375) for structured walks or light training 1-3 times a week. Select "Moderate" (1.55) if you workout 3-5 times a week with decent intensity. Select "Active" (1.725) only if you perform hard, exhausting athletic training almost daily.

Why has my weight loss stalled (metabolic adaptation)?

As you lose body mass, your BMR and TDEE naturally decrease because a smaller body requires fewer calories to function and move. Additionally, your body adapts to chronic deficits by reducing spontaneous movements (NEAT). To overcome a plateau, recalculate your calorie targets using your new weight, focus on increasing steps, or implement a temporary structured diet break at maintenance.

Is it possible to boost my BMR?

Yes, primarily by altering your body composition. Resistance training to build lean muscle mass is the most effective long-term strategy, as muscle burns more calories than fat even at rest. Additionally, high-protein diets increase the thermic effect of food (TEF), and getting sufficient sleep helps prevent hormonal down-regulation of thyroid function.

BMR/TDEE Calculator

Find your Basal Metabolic Rate (BMR) and Total Daily Energy Expenditure (TDEE) instantly using the sliders below.

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BMR/TDEE Calculator

Etekcity Digital Kitchen Food Scale (11 lb / 5 kg, 304 Stainless Steel)

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