BMR Calculator - Calculate your Basal Metabolic Rate

What is BMR?

Basal Metabolic Rate (BMR) is the number of calories your body needs to maintain basic physiological functions while at rest. It is the minimum number of calories you need to keep your body functioning.

Your BMR is influenced by a number of factors, including age, weight and height. You can use our BMR calculator to estimate your BMR.

Once you know your BMR, you can use it to help you determine how many calories you need to consume each day to maintain your current weight.

If you want to lose weight, you can create a calorie deficit by consuming fewer calories than your BMR. If you want to gain weight, you can create a calorie surplus by consuming more calories than your BMR.

How to calculate BMR?

There are a number of different formulas that can be used to calculate BMR. One of the most commonly used formulas is the Harris Benedict Equation, which takes into account your age, weight, height and sex.

The formula used in this calculator is the revised Harris Benedict Equantion (revised by Mifflin and St Jeor in 1990):

For men: BMR = 5 + (10 x weight in kg) + (6.25 x height in cm) - (5 x age in years)

For women: BMR = 161 - (10 x weight in kg) + (6.25 x height in cm) - (5 x age in years)

Note: The 95% confidence range for men is ±213.0 kcal/day, and ±201.0 kcal/day for women.

The original Harris Benedict Equation for calculating BMR was the follow:

For men: BMR = 66.473 + (13.7516 x weight in kg) + (5.0033 x height in cm) - (6.755 x age in years)

For women: BMR = 655.0955 + (9.5634 x weight in kg) + (1.8496 x height in cm) - (4.6756 x age in years)

These formulas are based on the original research conducted by James A. Harris and Francis G. Benedict in 1919.

What are macronutrients?

Macronutrients are the three main nutrients that make up the food we eat: carbohydrates, proteins and fats. Each of these macronutrients plays a different role in the body and provides a different number of calories per gram.

Carbohydrates are the body's main source of energy and are found in foods like bread, pasta, rice and fruit. They provide 4 calories per gram.

Proteins are essential for building and repairing tissues in the body and are found in foods like meat, fish, eggs and dairy products. Proteins are essentials in muscle building. They provide 4 calories per gram.

Fats are important for energy storage and hormone production and are found in foods like butter, oil, nuts and seeds. They provide 9 calories per gram.

In addition to macronutrients, foods also contain micronutrients like vitamins and minerals that are essential for good health.