BMR Calculator


Basal Metabolic Rate Calculator

Welcome to the Basal Metabolic Rate Calculator, your go-to tool for accurately estimating your body's Basal Metabolic Rate (BMR). Our platform is dedicated to helping individuals understand their metabolic needs to make informed decisions about their health and fitness.

At Basal Metabolic Rate Calculator, we prioritize precision and simplicity. By inputting essential details such as age, gender, weight, and height, our calculator utilizes scientifically validated formulas to calculate BMR efficiently. Armed with this knowledge, users can tailor their diet and exercise regimens to achieve their desired health goals effectively.

We understand that navigating the complexities of metabolism can be daunting, which is why we've designed our calculator to be user-friendly and accessible to all. Whether you're embarking on a weight loss journey, seeking to maintain a healthy lifestyle, or aiming to build muscle, our Basal Metabolic Rate Calculator empowers you to calculare BMR with confidence.

How to Calculate BMR?

Basal Metabolic Rate (BMR) is measured under stringent conditions during wakefulness, requiring complete rest and inactivity of the sympathetic nervous system. It represents the largest proportion of an individual's total caloric requirements. Daily caloric needs are determined by multiplying the BMR by a factor ranging from 1.2 to 1.9, depending on activity level.

Traditionally, BMR is estimated using equations derived from statistical data. The Harris-Benedict Equation, developed in the early years, was refined in 1984 for improved accuracy. However, it was surpassed by the Mifflin-St Jeor Equation in 1990, which has since been recognized as more precise. The Katch-McArdle Formula differs slightly, considering lean body mass in its calculation of resting daily energy expenditure (RDEE), a factor not addressed by the other equations.

The Mifflin-St Jeor Equation is generally considered the most accurate for calculating BMR, except in cases where individuals are lean and aware of their body fat percentage, where the Katch-McArdle Formula may be more suitable. Users can select the preferred equation for calculation in the settings.

Equations used by the calculator include (Matric Units):

Mifflin-St Jeor Equation:
For men:
BMR = 10 * W + 6.25 * H − 5 * A + 5
For women:
BMR = 10 * W + 6.25 * H − 5 * A − 161

Revised Harris-Benedict Equation:
For men:
BMR = 13.397 * W + 4.799 * H − 5.677 * A + 88.362
For women:
BMR = 9.247 * W + 3.098 * H − 4.330 * A + 447.593

Katch-McArdle Formula:
BMR = 370 + 21.6(1 − F) * W

Equations used by the calculator include (US Units):

Mifflin-St Jeor Equation:
For men:
BMR = 4.536 * W + 15.88 * H − 5 * A + 5
For women:
BMR = 4.536 * W + 15.88 * H − 5 * A − 161

Revised Harris-Benedict Equation:
For men:
BMR = 6.23 * W + 12.7 * H − 6.76 * A + 66.47
For women:
BMR = 4.35 * W + 4.7 * H − 4.68 * A + 655.1

Katch-McArdle Formula:
BMR = 370 + 9.82(1 − F) * W

W is body weight in kilograms
H is body height in centimeters
A is age
F is body fat percentage


  • What is a BMR calculator?
    A BMR (Basal Metabolic Rate) calculator is a tool used to estimate the number of calories your body needs to maintain basic physiological functions at rest. It helps you understand your metabolic rate, which is crucial for planning your diet and fitness goals.

  • How does a BMR calculator work?
    Our BMR calculator utilizes scientifically validated formulas that take into account factors such as age, gender, weight, and height to estimate your Basal Metabolic Rate. By inputting these details, the calculator provides you with an approximation of the calories your body requires to function at rest.

  • Why is knowing my BMR important?
    Knowing your BMR is essential for creating a personalized nutrition and fitness plan. It serves as a baseline for determining your daily calorie needs, which can help you achieve weight loss, weight maintenance, or muscle gain goals more effectively.

  • Is a BMR calculator accurate?
    While BMR calculators provide estimations based on standardized formulas, individual variations in metabolism may affect accuracy. However, our calculator strives to offer reliable results for general guidance.

  • How often should I use a BMR calculator?
    It's beneficial to calculate your BMR periodically, especially when there are significant changes in your weight, age, or activity level. Regularly reassessing your BMR ensures that your nutrition and fitness plan remains tailored to your evolving needs.