Frequently Asked Questions.

To calculate your BMR manually, use the clinically standard Mifflin–St Jeor formula with your weight in kilograms, height in centimeters, and age in years. For men: BMR = (10 × weight in kg) + (6.25 × height in cm) - (5 × age in years) + 5. For women: BMR = (10 × weight in kg) + (6.25 × height in cm) - (5 × age in years) - 161. Alternatively, use our free online BMR calculator to get instant, real-time results in metric (kg, cm) or imperial (lbs, ft & in) units.

To calculate BMR for Indians, the Mifflin–St Jeor equation is widely used by clinical dietitians and Indian Council of Medical Research (ICMR) reference guidelines. However, research indicates that Asian Indians typically exhibit a 'thin-fat' phenotype (higher visceral body fat percentage and lower skeletal muscle mass at equivalent BMI). As a result, standard weight-based formulas can slightly overestimate resting burn by 5% to 8%. For the most accurate Indian BMR calculation, determine your body fat percentage and use the Katch–McArdle formula (BMR = 370 + 21.6 × Lean Body Mass in kg), which accounts directly for muscle mass.

Basal Metabolic Rate (BMR) represents the baseline number of kilocalories your body burns in a 24-hour period while resting at a comfortable temperature in a post-absorptive state. This energy sustains essential life functions including breathing, heart contractions, brain activity, cell regeneration, protein synthesis, and core body temperature regulation.

BMR accounts strictly for vital involuntary organ functions at rest (roughly 60% to 75% of your total daily expenditure). Total Daily Energy Expenditure (TDEE) accounts for your entire day's energy needs by multiplying your BMR by an activity multiplier that covers walking, work, digestion (Thermic Effect of Food), and deliberate exercise.

While frequently used interchangeably in commercial calculators, BMR and RMR (Resting Metabolic Rate) have technical laboratory differences. True BMR requires an overnight fast in a specialized clinical facility under strict temperature control immediately upon waking. RMR is measured under less stringent resting conditions and is generally 3% to 10% higher than strict BMR.

The average adult female burns between 1,300 and 1,550 kcal/day at rest, while the average adult male burns between 1,650 and 1,950 kcal/day. However, individual values vary based on height, weight, age, and proportion of lean muscle mass.

Multiple peer-reviewed clinical studies (including a landmark evaluation by the American Dietetic Association) determined the Mifflin–St Jeor equation to be the most reliable formula for non-obese and obese adults, predicting resting expenditure within 10% of indirect calorimetry. For athletic individuals with low body fat, the Katch–McArdle formula is preferred because it calculates expenditure directly from Lean Body Mass.

Biological males typically possess more skeletal muscle mass and less essential body fat than females of equivalent total weight. Because muscle tissue consumes more energy than adipose tissue at rest, male equations incorporate a positive offset (+5 in Mifflin-St Jeor) while female equations incorporate a negative offset (-161).

After age 20, BMR decreases by roughly 1% to 2% per decade. This metabolic deceleration is largely driven by age-related sarcopenia (gradual loss of skeletal muscle tissue) and subtle decreases in internal organ mass. Regular strength training and higher protein consumption significantly mitigate this decline.

To use your BMR to lose weight: (1) Calculate your BMR (calories needed strictly at rest). (2) Multiply your BMR by your physical activity factor to determine your Total Daily Energy Expenditure (TDEE, your maintenance calories). (3) Subtract a moderate deficit of 300 to 500 kcal from your TDEE—never subtract from your BMR. Eating 500 kcal below your TDEE yields approximately 0.5 kg (1 lb) of fat loss per week, while staying at or above your BMR prevents thyroid downregulation and muscle loss.

If your BMR is 1400 calories, you should typically consume between 1,400 and 1,650 calories per day to lose weight: First find your TDEE. If sedentary (desk job, minimal movement), your TDEE is about 1,680 calories (1400 × 1.2). If you perform light to moderate workouts, your TDEE is around 1,925 to 2,170 calories (1400 × 1.375 to 1.55). Subtracting a safe 400–500 calorie deficit from your TDEE gives you 1,400 to 1,670 calories daily. You should not drop below your 1,400 kcal BMR, as that energy is essential for vital organs at rest.

No! A common and dangerous mistake is treating BMR as a calorie ceiling. Your calorie target for weight loss should be calculated by subtracting 300 to 500 kcal from your TDEE (Total Daily Energy Expenditure), not your BMR. Consuming less than your BMR deprives vital organs of fuel and leads to metabolic slowdown, fatigue, and muscle loss.

Be honest with your weekly routine: If you work an office desk job and take fewer than 5,000 steps per day without gym sessions, select 'Sedentary' (1.2x). If you walk moderately or train 1–3 days per week, select 'Light' (1.375x). If you lift weights 3–5 days per week, choose 'Moderate' (1.55x). It is usually safer to pick a slightly lower activity level when calculating fat loss calories.

Yes. The most effective way to elevate your baseline BMR is by increasing your lean muscle mass through progressive resistance training. Muscle tissue is metabolically active around the clock. Eating sufficient dietary protein also raises the thermic effect of food (TEF), consuming 20% to 30% of protein calories purely during the digestion process.

Never. All calculations are executed locally on your device inside your web browser. No age, weight, height, or gender data is ever transmitted to an external server or stored in a database. Only your chosen dark or light mode theme is saved in your browser's local storage.

No. Standard BMR equations (Mifflin–St Jeor, Harris–Benedict, Katch–McArdle) were validated exclusively on non-pregnant adult populations aged 18 to 100. Rapidly growing children, pregnant mothers, and lactating women have fundamentally different metabolic requirements and must seek clinical guidance from pediatricians or obstetricians.