Basal Metabolic Rate (BMR) Calculator

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Your BMR (Basal Metabolic Rate) is the estimated minimum level of energy required to sustain the body's vital functions when at rest. The Harris-Benedict formula is used to calculate the BMR (Basal Metabolic Rate). By using the Basal Metabolic Rate (BMR) Calculator you can get an estimated amount of calories your body burns per day just from basic body functions. This will help you to determine how many more calories you are in excess from your diet and will help you to set realistic weight loss and exercise goals.


Basal metabolic rate is the amount of energy expended while at rest in a neutrally temperate environment, in the post-absorptive state (meaning that the digestive system is inactive, which requires about twelve hours of fasting in humans). The release of energy in this state is sufficient only for the functioning of the vital organs, such as the heart, lungs, brain and the rest of the nervous system, liver, kidneys, sex organs, muscles and skin.


Fill in the details below and click the calculate button to calculate your BMR. Remember, BMR is only the amount of calories expended 'to live'.


Enter Your Age(years)
Enter Your Weight(lbs)
Enter Your Height(inches)
BMR Result(calories/day)


Note: BMR calculators should only be used to provide a rough guideline on daily energy expended. Actual values cannot be attained using such calculators, and may be quite inaccurate depending on several factors such as geographic location, body-type, diet, body composition, supplementation and some genetic factors. Values which extend +/- 15% above and below your calculated BMR may be a more accurate representation of your actual BMR range as daily fluctuations are constant and your BMR is rarely the same on a daily basis.


Why is calculating your Basal Metabolic Rate Important?

Your BMR, or basal metabolic rate (metabolism), is the energy (measured in calories) expended by the body at rest to maintain normal bodily functions. This continual work makes up about 60-70% of the calories we use ("burn" or expend) and includes the beating of our heart, respiration, and the maintenance of body temperature. Your BMR is influenced by a number of factors, including age, weight, height, gender, environmental temperature, dieting, and exercise habits.


Because of the increased activity of cells undergoing division, the younger the person, the higher (faster) the metabolism. And the taller and heavier a person is, the faster their metabolism. Because of the greater percentage of lean muscle tissue in the male body, men generally have a 10-15% faster BMR than women. Restrictive and traditional diets may cause your BMR to drop as much as 20%. People living in tropical or very cold environments generally have BMR's 5-20% higher than those living in more temperate climates. In general, depending on the intensity and duration, consistent exercise will also increase your BMR.


0 # start off rightmadscientist 2012-10-13 20:43
I think that using this kind of tool is very helpful at the start of a diet because it helps to narrow down how many calories you actually need and how many you must cut back in order to lose a certain amount of weight every week.
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+1 # confusedRon 2012-09-21 14:04
The number this calculator gave me is a lot lower than the calories that I’m allowed every day according to my doctor. I’m not sure why there is such a big discrepancy there (almost 300 calories).

I was under the understanding that I should be eating the number of calories that my body needs for its basic functions, so that I have enough to get through the day easily, but that I should then exercise on top of that so that I burn off stored fat.

If I’m eating 300 calories per day more than I absolutely need, aren’t I working against myself?
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0 # RE: kellykatt 2012-08-14 20:32
Quoting baglady201:
I am not clear on how to use this info to promote weight loss

I use this to determine the minimum number of calories that I need in a day to stay healthy. Since a lot of diets are calorie based, you need to know how many you need just to perform your basic functions in a day like your heart beating, keeping your temperature, breathing, and that sort of thing. Anything less than that, and you're putting your health at risk.

It's not really a precise number, especially because it can fluctuate from one day to the next, depending on what you do, how warm it is out, etc etc, but it can give you an overall ballpark idea as to whether or not you're on the right track with your calorie limits.
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0 # ?baglady201 2012-04-04 00:55
I am not clear on how to use this info to promote weight loss
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0 # unique toolPaplo 2012-01-16 07:20
I’ve never seen a calculator like this anywhere else. This is a great tool to combine with the other options on this website to really get to know how you can lose weight.
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+2 # tracy1976 2011-10-31 07:45
This is really interesting. I didn't know that this sort of thing could be calculated using a little widget on a website. I guess there isn't anything that computers can't do these days. I think this is a helpful little tool that can help you gain just that little bit of extra understanding so that your diet can be perfected and become more effective.
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+2 # Mike 2011-10-27 03:12
when you work this in with the other calorie estimator tool on this site it actulally gives you a pretty good idea of what you should be doing in terms of how much you should eat. this sort of thing helps you to know what you're doing. Now if only it lost weight for you, too!
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