BMR Calculator

BMR icon

Calculate your Basal Metabolic Rate (BMR) with this BMR calculator. Your BMR is the amount of energy you expend each day when at rest. This calculator will also work out your daily calorie requirements. Gender, age, height and weight are required to calculate your BMR and you can hoose between metric and imperial units. You can also choose to use the Mifflin - St Jeor equation (default) or the Harris-Benedict equation.


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Disclaimer. Please note:

The results given by this BMR calculation tool should be used only as a guide and should not replace medical advice. Please bear in mind that, when interpreting the results of this BMR calculator, other factors such as your lean body mass should be considered. More information on that is available below.

You should always speak to a qualified Doctor or health professional for advice and guidance before making any dramatic changes to your lifestyle.

What Is BMR?

BMR stands for Basal Metabolic Rate and represents the number of calories you would burn in a day if you were inactive and stayed in bed all day. Our BMR calculator allows you to calculate not only the number of calories you burn when inactive, but also a daily calorie figure that takes into account your lifestyle activity level. These two figures together give you a representative figure for your daily calorie intake. You can learn more about BMR in our article, how to calculate BMR.

It is important to bear in mind that Basal Metabolic Rate calculations do not take into account for lean body mass, which will obviously have a factor of its own. Very muscular people, for example, will receive a figure that probably under-estimates their calorie needs and very overweight people will likely get a calculation that over-estimates their calorie requirements.

BMR means Basal Metabolic Rate

BMR Formula

In 1919, the Harris-Benedict formula was created to calculate BMR. However, it's since been superseded by the new and improved Mifflin - St Jeor BMR formula, which was established in 1990. Our calculator gives options for using either formula. You can see the equations involved in each BMR formula here.

Other health calculators available on this website include the popular BMI calculator and the pregnancy calculator.

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