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BMR (Basal Metabolic Rate) Calculator

What is BMR and RMR?

Both BMR and RMR are estimates of how many calories you would burn if you were to do nothing but rest for 24 hours. They represent the minimum amount of energy required to keep your body functioning, including your heart beating, lungs breathing, and body temperature normal. BMR stands for Basal Metabolic Rate, and is synonymous with Basal Energy Expenditure or BEE. BMR measurements are typically taken in a darkened room upon waking after 8 hours of sleep; 12 hours of fasting to ensure that the digestive system is inactive; and with the subject resting in a supine or reclining position.

RMR stands for Resting Metabolic Rate, and is synonymous with Resting Energy Expenditure or REE. RMR measurements are typically taken under less restricted conditions than BMR, and do not require that the subject spend the night sleeping in the test facility prior to testing.

Calculate your BMR and RMR

Our BMR & RMR Calculator will calculate your BMR and RMR for you, and don't worry if you measure yourself in pounds, feet or centimetres. We'll convert the numbers to fit the equations.

BMR
RMR
BMR adjusted for activity
RMR adjusted for activity
Gender	Male Female
Age
Height (inches or cm)
Weight (pounds or kilos)
Activity Type
I am submitting my measurement in	Inches and Pounds Centimetres and kilos

Note that:

When your weight goes down, your BMR and RMR go down.
When your height goes down, your BMR and RMR go down.
When your age goes up, your BMR and RMR go down.
This means that as you get older, shorter and lose weight, your BMR and RMR will go down and you will need to eat less or exercise more to maintain your current weight.

Using the Calculations

As BMR and RMR only represent resting energy expenditure, an adjustment must be made to reflect activity level. This is done by multiplying your BMR or RMR by an activity factor:

Activity Factor	Activity Category
1.2	Bed rest
1.3	Sedentary
1.4	Active
1.5	Very active

Use of these activity factors produces a very rough estimate, and there are many different opinions on what these activity factors should be.

Body Composition

The equations do not take into account your body composition (percent muscle vs. fat) and are therefore less accurate if you have a non-typical amount of muscle. This is because muscle burns more calories than fat. A person with an above average amount of muscle will have a higher BMR or RMR than calculated; a person with a below average amount of muscle will have a lower BMR or RMR than calculated.

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