RMR Calculator

RMR Calculator

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Weight (kg/lbs):
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RMR Formula:

Mifflin - St Jeor Formula

Men: ( 6.25 * height ) + ( 9.99 * weight ) - ( 4.92 * age ) + 5
Women: ( 6.25 * height ) + ( 9.99 * weight ) - ( 4.92 * age ) - 161

All units metric.

RMR Definition

Resting Metabolic Rate, also known as Basal Metabolic Rate, is the amount of calories your body burns in a day while at rest.

How Your Body Uses Calories

The human body requires a certain amount of calories each day to continue to run the various processes we take for granted.

  • Maintain organ function throughout the body including skin – the body’s largest organ
  • Maintain brain function – consuming healthy fats is also essential for this
  • Growing hair and nails
  • Regulating body temperature

Your caloric needs depend on your age, gender, height and weight, which is why a RMR calculator is an excellent place to start. A visit with your GP or a registered dietician is also recommended in order to create a more accurate picture of your caloric needs.

Efficient Calorie Burning

Lean muscle mass burns more calories than fat, even at rest, through a process called thermogenesis. A person with a fit body will continue to burn more calories after aerobic activity than a person who is out of shape.

For someone trying to lose, gain, or maintain their weight, knowing exactly how much it takes for your body to function is essential. If a person knows it takes X calories for the body to run its processes, and they do Y amount of exercise or general activity per day (a person with a strenuous job or one who rushes about on their feet will need more calories per day than someone who sits at a desk), then they will be better able to calculate how many calories to consume in order to lose, gain or maintain.

Losing Weight

The bottom line for weight loss is to burn more calories in a day than you consume. Modern life is sedentary, and this means adding cardio exercise and weight training as a supplement to your day, as well as eating well and counting calories.

Once again, we must stress that more calories are burned at activity and at rest by someone with lean muscle mass. So if a person is trying to lose weight, they should not focus on cardio alone. Building muscle will raise their RMR and help them shed pounds quicker and more efficiently.

How to Calculate RMR

Let's be honest - sometimes the best rmr calculator is the one that is easy to use and doesn't require us to even know what the rmr formula is in the first place! But if you want to know the exact formula for calculating rmr then please check out the "Formula" box above.

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You can get a free online rmr calculator for your website and you don't even have to download the rmr calculator - you can just copy and paste! The rmr calculator exactly as you see it above is 100% free for you to use. If you want to customize the colors, size, and more to better fit your site, then pricing starts at just $29.99 for a one time purchase. Click the "Customize" button above to learn more!