BMR Calculator

Calculate your Basal Metabolic Rate and daily calorie needs

Your Information

years

Your current age in years

kg

Your current body weight

cm

Your height in centimeters

Your typical weekly physical activity level

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Understanding BMR Calculator

Input Fields Explained

Age

Your current age in years. BMR decreases with age as metabolism naturally slows down over time.

Gender

Biological sex affects BMR calculations. Males typically have higher BMR due to greater muscle mass.

Weight & Height

Your current body measurements. Larger bodies require more energy to maintain basic functions, increasing BMR.

Activity Level

Your typical physical activity. This multiplies your BMR to calculate Total Daily Energy Expenditure (TDEE).

Mifflin-St Jeor Equation

For Men:

BMR = (10 × weight in kg) + (6.25 × height in cm) - (5 × age) + 5

For Women:

BMR = (10 × weight in kg) + (6.25 × height in cm) - (5 × age) - 161

TDEE (Total Daily Energy Expenditure):

TDEE = BMR × Activity Multiplier

Activity Level Multipliers

SedentaryBMR × 1.2

Little or no exercise

Lightly ActiveBMR × 1.375

Exercise 1-3 days/week

Moderately ActiveBMR × 1.55

Exercise 3-5 days/week

Very ActiveBMR × 1.725

Exercise 6-7 days/week

Extremely ActiveBMR × 1.9

Hard exercise daily or physical job

Key Concepts

🔥 Calories at Rest

BMR is the energy your body needs just to stay alive while at complete rest.

💪 Muscle Matters

More muscle mass increases BMR since muscle tissue burns more calories than fat.

🎯 Weight Goals

Use TDEE to determine calorie intake for weight loss, maintenance, or gain.

📊 Individual Variance

Actual BMR can vary ±10% due to genetics, hormones, and other factors.

💡Tip: Your BMR represents the minimum calories needed to maintain vital functions. For weight loss, create a moderate calorie deficit (typically 300-500 calories below TDEE). For weight gain, add 300-500 calories above TDEE. Always consult healthcare professionals before making significant dietary changes.