This RMR calculator determines the number of calories your body needs to maintain when resting the resting metabolic rate. Read more on this subject and discover some example calculations below the form.

Weight *
Height *
Age *
Gender *
Weight * 
Height *
Age *       
Gender *

How does this RMR calculator work?

This is a health tool that enables you to discover your resting metabolic rate which is known as RMR or BMR (stands for basal metabolic rate). In order to compute how many calories your body requires for it to function properly you will need to enter your age, gender, weight and height so that your data can be then put in some formulas that determine this personalized value.

The formulas employed are described below. You will be then given the number of calories that you must have daily in order for your body to work at normal pace. In order for you to find it easier to work with, the RMR calculator has two tabs for each of the measurement systems so you can enter your weight in either lbs or kg and your height in ft in or cm.

What is the resting metabolic rate?

This is defined as the amount of energy expended daily by our body when resting. Practically this is the amount of energy expended for keeping our body alive with all the vital functions (for instance, but not limited to: heart beating, nervous system, skin, muscles). So it means that even when sleeping our body burns calories.

The RMR formula (practically the BMR formula because most people refer to Basal Metabolic Rate):

  • When using the English units:

Female - RMR = 655 + (4.35 x weight in pounds) + (4.7 x height in inches) - (4.7 x age in years).
Male - RMR = 66 + (6.23 x weight in pounds) + (12.7 x height in inches) - (6.8 x age in years).

  • When using the Metric units:

Female - RMR = 655 + (9.6 x weight in kg) + (1.8 x height in cm) - (4.7 x age in years).
Male- RMR = 66 + (13.7 x weight in kg) + (5 x height in cm) - (6.8 x age in years).

Please remember that this RMR calculator does not take account of any particularized contextual factors when estimating the resting metabolic rate

Example calculation

Here are some examples of cases and their respective results. You can make your personalized calculations and try as many scenarios as you like.

Tab Gender Age Weight Height BMR value
English Female 34 134lbs 5ft 5in 1,384 calories/ day
English Male 28 180lbs 6ft 3in 1,950 calories/ day
Metric Female 26 62kg 172cm 1,438 calories/ day
Metric Male 42 107kg 185cm 2,171 calories/ day

How to use RMR/ BMR in your weight loss plan?

By now you are probably wondering how you can put this index to use and how knowing the basic calorie requirement of your body will help you establish your usual daily calorie intake.

  • Maintaining your current weight: then you should take a look at your lifestyle and make a simple multiplication.

- Sedentary lifestyle – BMR*1.2

- Little exercise – BMR*1.37

- Moderate exercise – BMR*1.55

- Very active – BMR*1.72

- Very soliciting – BMR*1.9

(The above values are based on the Harris Benedict formula for calorie intake)

  • Loosing weight in a healthy way: You might want to consider an intake that is between your BMR value and BMR*1.5 and to accompany your diet with exercise.
  • Gaining weight: In case you need to put on some pounds you might want to exceed the limit described at the maintaining your current weight point.


1) Harris J, Benedict F. (1918) A Biometric Study of Human Basal Metabolism. PNAS 4 (12): 370–3.

2) Müller B, Merk S, Bürgi U, Diem P. (2001) Calculating the basal metabolic rate and severe and morbid obesity Praxis (Bern 1994) 90 (45): 1955–63.

19 Jan, 2015