Basal Metabolic Rate Calculator
Calculate your Basal Metabolic Rate (BMR) instantly. This free calculator uses your age, gender, height, and weight to determine the calories your body burns at rest.
What is a Basal Metabolic Rate Calculator?
This Basal Metabolic Rate Calculator estimates the number of calories your body burns while at complete rest. It represents the energy required to maintain basic physiological functions such as breathing, circulation, and cell production.
Knowing your BMR is the starting point for any weight management plan. Whether you want to lose weight, gain muscle, or maintain your physique, understanding your resting metabolism is essential.
BMR Formula Calculator Logic
Our tool uses the Mifflin-St Jeor equation, widely considered the most accurate formula for estimating BMR in healthy adults. The calculation varies based on gender:
- Men: BMR = (10 × weight in kg) + (6.25 × height in cm) - (5 × age in years) + 5
- Women: BMR = (10 × weight in kg) + (6.25 × height in cm) - (5 × age in years) - 161
BMR by Age and Gender
Your metabolic rate is heavily influenced by personal factors:
- Age: Metabolism naturally slows down as you age, reducing your calorie needs.
- Gender: Men typically have higher BMRs than women due to higher average muscle mass.
- Size: Larger bodies require more energy to function.
Resting Metabolism vs. TDEE
While BMR measures energy burned at rest, your Total Daily Energy Expenditure (TDEE) includes calories burned through physical activity.
Once you calculate your BMR, multiply it by an activity factor (as shown in the results table) to find your maintenance calories:
- Sedentary: BMR × 1.2
- Light Activity: BMR × 1.375
- Moderate Activity: BMR × 1.55
- High Activity: BMR × 1.725
For a broader look at health metrics, check out our BMI Calculator to assess your weight category.
? Frequently Asked Questions
BMR stands for Basal Metabolic Rate. It is the number of calories your body needs to accomplish its most basic (basal) life-sustaining functions.
This calculator uses the Mifflin-St Jeor equation, which studies have shown to be more accurate than the older Harris-Benedict formula. However, actual metabolism can vary by individual genetics.
To lose weight, you generally need to consume fewer calories than your TDEE (Total Daily Energy Expenditure). A safe deficit is usually 500 calories below your TDEE.
Yes. Muscle tissue burns more calories at rest than fat tissue. Increasing muscle mass will increase your BMR.