Smart Health Calculator

BMR Calculator

Estimate how many calories your body burns at complete rest. This BMR Calculator also helps you understand your daily calorie needs based on your lifestyle and activity level.

Calculate Your BMR

Gender

Age

Weight in kg

Height in cm

Activity Level

What Is BMR?

BMR means Basal Metabolic Rate. It is the number of calories your body needs to perform basic functions like breathing, blood circulation, cell repair, and body temperature control while resting.

Why It Matters

Knowing your BMR gives you a better starting point for weight loss, weight maintenance, or muscle gain. It helps you avoid random calorie guessing and build a more realistic health plan.

Activity Adjustment

Your body burns more calories when you move, exercise, or work physically. This tool multiplies your BMR by activity level to estimate your total daily energy needs.

How This BMR Calculator Works

This calculator uses the popular Mifflin-St Jeor formula, which is widely used for estimating resting calorie needs. You only need to enter your gender, age, weight, height, and activity level.

Enter Your Basic Details

Add your gender, age, weight in kilograms, and height in centimeters. These details directly affect your calorie calculation.

Select Your Activity Level

Choose how active you are in a normal week. A person with a desk job usually needs fewer calories than someone with regular training or physical work.

Get Your Calorie Estimate

The tool shows your resting BMR, estimated daily calorie needs, and simple calorie targets for weight loss, maintenance, and weight gain.

BMR Formula Used

The calculator uses the Mifflin-St Jeor equation:

For men: BMR = 10 × weight + 6.25 × height - 5 × age + 5

For women: BMR = 10 × weight + 6.25 × height - 5 × age - 161

This result is an estimate, not a medical diagnosis. For serious health goals, medical conditions, pregnancy, athletic training, or strict diet planning, always consult a qualified health professional.

Frequently Asked Questions

A good BMR depends on your age, gender, height, weight, and body composition. Taller and heavier people usually have a higher BMR, while older adults often have a lower BMR.

No. BMR is the calories your body burns at rest. Daily calories include your BMR plus calories burned through walking, work, exercise, digestion, and other daily activities.

Yes. BMR helps you understand your calorie baseline. For weight loss, many people create a moderate calorie deficit from their estimated daily calorie needs.

Activity level changes the result because your body burns extra calories during movement, exercise, and physical work. That is why two people with the same BMR may need different daily calories.

This calculator gives a useful estimate based on standard formulas. Real calorie needs can vary because of muscle mass, hormones, sleep, health conditions, and daily routine.