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Health & Fitness

BMR Calculator

Calculate your Basal Metabolic Rate — the number of calories your body burns at rest.

Calculate Your BMR

What Is BMR?

BMR (Basal Metabolic Rate) is the number of calories your body needs to perform basic life-sustaining functions while at rest. This includes breathing, circulation, cell production, and nutrient processing. It represents the minimum energy required to keep your body functioning.

How Is BMR Calculated?

This calculator uses the Mifflin-St Jeor equation, one of the most accurate BMR formulas:

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

What Does BMR Tell You?

BMR tells you the baseline number of calories your body burns each day. Understanding your BMR helps you make informed decisions about calorie intake for weight management goals. However, your actual daily calorie needs depend on your activity level.

BMR vs Daily Calorie Needs

BMR is the energy your body uses at complete rest. Your daily calorie needs (Total Daily Energy Expenditure, or TDEE) are higher because normal activities, exercise, and digestion also burn calories. TDEE is calculated by multiplying BMR by an activity factor ranging from 1.2 (sedentary) to 1.9 (very active).

Health Disclaimer

This calculator provides estimates for informational purposes only. It is not medical advice or a diagnosis. Individual health and nutritional needs can vary. Consult with a healthcare professional for personalized guidance.

Calculated Locally

All calculations are performed in your browser. Your health information is never stored or transmitted.

Frequently Asked Questions

Common questions and answers about this tool

BMR (Basal Metabolic Rate) is the number of calories your body burns at rest, while BMI (Body Mass Index) is a weight-to-height ratio. BMR tells you energy needs; BMI categorizes weight status. Both are useful health metrics but measure different things. Use our BMI calculator to check your Body Mass Index.
First calculate your BMR, then multiply by your activity level: 1.2 (sedentary), 1.375 (light exercise), 1.55 (moderate exercise), 1.725 (very active), or 1.9 (extra active). This gives your Total Daily Energy Expenditure (TDEE). Use our percentage calculator to determine calorie deficits or surpluses for weight goals.
Yes, BMR typically decreases with age. This is partly due to loss of muscle mass and changes in hormonal and neurological processes. That is why age is a required input in the Mifflin-St Jeor and Harris-Benedict BMR formulas. Calculate your exact age with our age calculator.
The Mifflin-St Jeor equation is considered more accurate for modern populations and is recommended by many nutritionists. However, the Harris-Benedict formula is also widely used and reliable. Individual results may vary based on body composition.
Yes! To lose weight, consume fewer calories than your TDEE (BMR times activity level) but never below your BMR. Eating below BMR can slow metabolism and cause health issues. Aim for a 500-calorie daily deficit for safe, sustainable weight loss of about 1 lb/week.
Different calculators may use different formulas (Mifflin-St Jeor, Harris-Benedict, Katch-McArdle). Our calculator provides both Mifflin-St Jeor and Harris-Benedict results for comparison. Factors like muscle mass, genetics, and hormones can also cause variations. Use our unit converter to convert between metric and imperial measurements.

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