Basal Metabolic Rate (BMR) Calculator
Published : 2009-03-31 - Updated : 2020-04-02
Author : Disabled World - Contact: www.disabled-world.com
Synopsis* : Basal Metabolic Rate calculator shows the number of calories you burn when at rest in bed or resting metabolic rate RMR. Basal Metabolic Rate (BMR) can be responsible for burning up to 70% of the total calories expended as you will expend energy no matter what you're doing, even when sleeping. Illness, previously consumed food and beverages, environmental temperature, and stress levels can affect one's overall energy expenditure as well as one's BMR.
Basal Metabolic Rate (BMR) is the minimum calorific requirement needed to sustain life in a resting individual, or 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).
Basal Metabolic Rate is defined as the minimal rate of energy expenditure per unit time by warm-blooded animals at rest. It is reported in energy units per unit time ranging from watt (Joule/second) to ml O2/min or Joule per hour per kg body mass J/(h.kg)). Proper measurement requires a strict set of criteria be met. These criteria include being in a physically and psychologically undisturbed state, in a thermally neutral environment, while in the post-absorptive state (i.e., not actively digesting food).
In bradymetabolic animals, such as fish and reptiles, the equivalent term Standard metabolic rate (SMR) is used. It follows the same criteria as BMR, but requires the documentation of the temperature at which the metabolic rate was measured. This makes BMR a variant of standard metabolic rate measurement that excludes the temperature data, a practice that has led to problems in defining "standard" rates of metabolism for many mammals.
BMR can be responsible for burning up to 70% of the total calories expended as you will expend energy no matter what you're doing, even when sleeping. Thus your Basal Metabolic Rate is the number of calories you'd burn if you were to stay in bed all day. Basal metabolic rate is usually by far the largest component of total caloric expenditure.
However, the Harris-Benedict equations are only approximate and variation in BMR (reflecting varying body composition), in physical activity levels, and in energy expended in thermogenesis make it difficult to estimate the dietary consumption any particular individual needs in order to maintain body weight. 2000 kilo-calories is often quoted but is no more than a guideline.
BMR Decreases with Age and with Loss of Lean Body Mass
Increasing muscle mass increases BMR.
Aerobic fitness level, a product of cardiovascular exercise, while previously thought to have effect on basal or resting metabolic rate (RMR), has been shown in the 1990s not to correlate with BMR, when fat-free body mass was adjusted for. New research has however come to light which suggests aerobic exercise does increase resting energy consumption. Illness, previously consumed food and beverages, environmental temperature, and stress levels can affect one's overall energy expenditure as well as one's BMR.
BMR is measured under very restrictive circumstances when a person is awake, but at complete rest.
An accurate BMR measurement requires that the person's sympathetic nervous system not be stimulated. A more common and closely related measurement, used under less strict conditions, is resting metabolic rate (RMR).
Studies published in 1992 and 1997 indicate the level of aerobic fitness of an individual does not have any correlation with the level of resting metabolism.
Both studies find that aerobic fitness levels do not improve the predictive power of fat free mass for resting metabolic rate.
Some studies suggest a minimum of 20 to 25 minutes of cardiovascular training per day can temporarily increase the basal metabolic rate by around 10%, owing to an increase in the metabolism of the working muscles required for recovery as well as storage of glycogen and other fuel sources used by the body like ATP and Creatine.
The BMR Calculator below will calculate your Basal Metabolic Rate (BMR) - the number of calories you would burn if you were to stay in bed all day. To see how many calories you burn performing certain activities see How to Count and Calculate Calories.
About the Author
Disabled World (Disabled-World.Com) is an independent disability community established in 2004 to provide disability news, assistive technology reviews, and disability sporting events, as well as general information for people with disabilities, seniors, their family and/or carers. Be sure to check out our homepage for informative reviews, exclusive stories and how-tos. You can also find us on Twitter, Facebook, and LinkedIn.
Related Medical Calculators Documents
- 1: Blood Pressure Chart: Low, Normal, High Reading by Age : Blood pressure table showing if adults and children have high, low, or healthy average blood pressure range for their age, includes other helpful cardiac related information.
- 2: Medical Triage Explanation and Tag Color Chart : Chart and information concerning medical triage, the process of determining priority of patient treatment by severity of condition or likelihood of recovery with and without treatment.
- 3: Pregnancy Calculator: Babies Due Date Calculator : This pregnancy calculator shows due date of your baby and several other interesting dates including date of conception and number of weeks you are pregnant.
- 4: DVPRS 2.0 Pain Scale Chart for Service Personnel and Veterans : The Defense and Veterans Pain Rating Scale DVPRS 2.0 is a pain assessment tool using a rating scale, word descriptors, color coding, pictorial facial expressions matching pain levels.
- 5: Hair Loss Results : Results from our when will I go bald hair loss calculator and information.
*Disclaimer: Disabled World provides general information only. Materials presented are in no way meant to be a substitute for professional medical care by a qualified practitioner, nor should they be construed as such. Any 3rd party offering or advertising on disabled-world.com does not constitute endorsement by Disabled World. View our Advertising Policy for further information. Please report outdated or inaccurate information to us.
Journal: Disabled World. Language: English (U.S.). Author: Disabled World. Electronic Publication Date: 2009-03-31 - Revised: 2020-04-02. Title: Basal Metabolic Rate (BMR) Calculator, Source: <a href=https://www.disabled-world.com/calculators-charts/bmr-calculator.php>Basal Metabolic Rate (BMR) Calculator</a>. Retrieved 2021-04-18, from https://www.disabled-world.com/calculators-charts/bmr-calculator.php - Reference: DW#286-1282.