Energy balance calculator -
Previous Step Next Step. Starting Information Enter your starting information, including your weight, sex, age, height, and physical activity level.
Physical Activity Level Click the "Estimate Your Level" button to find your physical activity level. Typical physical activity level numbers range from 1.
Body Weight Planner How-to Video Watch a video to see how to use the Body Weight Planner. Goal Weight Enter your goal weight and when you would like to reach it. You can enter a number of days OR choose a specific date using the calendar.
Physical Activity Changes Click the "Calculate" button to show how you will change your physical activity. Changing your physical activity can help you reach and maintain your goal weight. Results The "reach your goal" and "maintain your goal" calories displayed assumes you will continue the physical activity changes you previously entered in step 3.
Want to Make a Change? Use the Previous Step button to go back and change your physical activity or goal weight. Tips for Eating Healthy Everything you eat and drink matters. The right mix can help you be healthier now and in the future.
Small amounts of your favorite high-calorie foods may be part of your weight-loss plan as long as you burn more calories than you take in. Additional resources: ChooseMyPlate. gov Just Enough for You: About Food Portions Changing Your Habits for Better Health. Find ways to build short bursts of physical activity into your day, like taking a minute walking break at work or using the stairs instead of an escalator or elevator.
Additional resources: Tips to Help You Get Active Staying Active at Any Size. Disclaimer : This information is for use in adults defined as individuals 18 years of age or older and not by younger people, or pregnant or breastfeeding women.
This information is not intended to provide medical advice. A health care provider who has examined you and knows your medical history is the best person to diagnose and treat your health problem.
If you have specific health questions, please consult your health care provider. Starting Information Advanced Controls: {{baselineAdvancedCtl? Units Metric Units. Starting Weight in {{weightUnitsRadioGroupLbl}} Weight.
Sex Sex. Age Age. Height in {{heightUnitsGroup}} Height. Physical Activity Level Physical Activity Level. Uncertainty Range Uncertainty Range. Estimated Input. Initial Resting Metabolic Rate as {{energyUnitsRadioGroupLbl}} Resting Metabolic Rate. Trigger Undo. Goal Weight Lifestyle Change Advanced Controls: {{lifestyleAdvancedCtl?
Weight Goal. Goal Weight. It was revised in to be more accurate and was used up until , when the Mifflin-St Jeor Equation was introduced. The Mifflin-St Jeor Equation also calculates BMR, and has been shown to be more accurate than the revised Harris-Benedict Equation.
The Katch-McArdle Formula is slightly different in that it calculates resting daily energy expenditure RDEE , which takes lean body mass into account, something that neither the Mifflin-St Jeor nor the Harris-Benedict Equation do. Of these equations, the Mifflin-St Jeor Equation is considered the most accurate equation for calculating BMR with the exception that the Katch-McArdle Formula can be more accurate for people who are leaner and know their body fat percentage.
The three equations used by the calculator are listed below:. where: W is body weight in kg H is body height in cm A is age F is body fat in percentage. The value obtained from these equations is the estimated number of calories a person can consume in a day to maintain their body-weight, assuming they remain at rest.
This value is multiplied by an activity factor generally 1. As such, in order to lose 1 pound per week, it is recommended that calories be shaved off the estimate of calories necessary for weight maintenance per day. For example, if a person has an estimated allotment of 2, calories per day to maintain body-weight, consuming 2, calories per day for one week would theoretically result in 3, calories or 1 pound lost during the period.
It is important to remember that proper diet and exercise is largely accepted as the best way to lose weight. It is inadvisable to lower calorie intake by more than 1, calories per day, as losing more than 2 pounds per week can be unhealthy, and can result in the opposite effect in the near future by reducing metabolism.
Losing more than 2 pounds a week will likely involve muscle loss, which in turn lowers BMR, since more muscle mass results in higher BMR. Excessive weight loss can also be due to dehydration, which is unhealthy. Furthermore, particularly when exercising in conjunction with dieting, maintaining a good diet is important, since the body needs to be able to support its metabolic processes and replenish itself.
Depriving the body of the nutrients it requires as part of heavily unhealthy diets can have serious detrimental effects, and weight lost in this manner has been shown in some studies to be unsustainable, since the weight is often regained in the form of fat putting the participant in a worse state than when beginning the diet.
As such, in addition to monitoring calorie intake, it is important to maintain levels of fiber intake as well as other nutritional necessities to balance the needs of the body. Calorie counting with the intent of losing weight, on its simplest levels, can be broken down into a few general steps:.
The above steps are an attempt at the most basic form of calorie counting. Calorie counting is not an exact science, and can be as complex as you want to make it.
The above does not consider the proportions of macronutrients consumed. While there is no exactly known, ideal proportion of macronutrients fats, proteins, carbohydrates , some balance is certainly advisable, and different foods have been found to have different effects on health, feelings of hunger, and number of calories burned.
Generally, minimally processed plant and animal foods tend to be more conducive to healthy weight loss and maintenance. There are many approaches to weight loss and there is no set ideal method that works for all people, which is why so many different diets and exercise regimens exist.
While some methods are more effective for each individual person, not all weight loss methods are equivalent, and studies suggest that some approaches are healthier than others.
That being said, one of the most commonly effective weight loss methods is counting calories. In its most basic form, calories consumed minus calories expended will result in weight gain if the result is positive, or weight loss if the result is negative.
However, this is far from a comprehensive picture, and many other factors play a role in affecting healthy, sustainable weight loss. For example, there exist conflicting studies addressing whether or not the type of calories or foods consumed, or how they are consumed, affects weight loss.
Studies have shown that foods that require a person to chew more and are more difficult to digest result in the body burning more calories, sometimes referred to as the thermic effect of food.
While the increase in burned calories may be marginal, foods that are more difficult to digest such as vegetables generally tend to be healthier and provide more nutrients for fewer calories than many processed foods.
Consistent with the view that in regards to weight loss, only net calories are important and not their source, there exist cases such as the Twinkie diet, where a person that solely counted calories while eating a variety of cake snacks managed to lose 27 pounds over two months.
As effective as this can be, it is certainly not suggested. While the participant did not seem to suffer any noticeable health detriments in this particular case, there are other less measurable factors that should be considered such as long-term effects of such a diet on potential for developing cancers, heart disease, and diabetes.
However, ignoring efficiency and health, sustained, significant reduction of caloric intake or increase of physical activity should result in weight loss, and counting calories can be an effective way to achieve this sole result.
Aside from being one viable method for facilitating weight loss, calorie counting has other somewhat less quantifiable advantages including helping to increase nutritional awareness.
Many people are completely unaware of, or grossly underestimate their daily caloric intake. Counting calories can help raise awareness of different types of foods, the number of calories they contain, and how these calories have a different effect on a person's feelings of satiety.
Once a person has a better understanding of how many calories are actually in that bag of chips that they can so easily inhale within minutes, how much of their daily caloric intake it consumes, and how little the chips do to satiate their hunger, portion control and avoidance of foods with empty calories tends to become easier.
Having actual caloric measurements can also assist in weight loss, since tangible calorie goals can be set, rather than simply trying to eat less. Also, although this is not necessarily directly related to calorie counting, studies have shown that portion control by simply eating from a smaller plate can help reduce calorie intake, since people tend to fill their plates and eat everything on their plates.
Many people do not realize that they are overeating, since they have become accustomed to restaurant-sized portions being the norm, when said portions can be up to three or more times larger than necessary for a typical meal.
Once a link is made between the amount of exercise that some snack equates to, many people find abstaining from that bag of chips to be the preferred option rather than performing an equivalent amount of exercise — which can lead to healthier eating habits.
In the end, however, what's important is picking a strategy that works for you. Calorie counting is only one method used to achieve weight loss amongst many, and even within this method, there are many possible approaches a person can take. Finding an approach that fits within your lifestyle that you think you would be able to adhere to is likely going to provide the most sustainable option and desirable result.
Zigzag calorie cycling is a weight loss approach that aims to counteract the human body's natural adaptive tendencies. Counting and restricting calories, as described above, is a viable method to lose weight, but over a period of time, it is possible for the body to adapt to the lower number of calories consumed.
In cases where this happens, a plateau in weight loss that can be difficult to surmount can result. This is where zigzag calorie cycling can help, by not allowing the body to adapt to the lower calorie environment. Zigzag calorie cycling involves alternating the number of calories consumed on a given day.
A person on a zigzag diet should have a combination of high-calorie and low-calorie days to meet the same overall weekly calorie target. For example, if your target calorie intake is 14, calories per week, you could consume 2, calories three days a week, and 1, the other four days of the week, or you could consume 2, calories each day.
In both cases, 14, calories would be consumed over the week, but the body wouldn't adapt and compensate for a 2,calorie diet. This also allows a person more flexibility in their diet, allowing them to plan around occasions, such as work or family gatherings, where a person may consume more calories.
Consuming a lower number of calories on other days can allow a person to enjoy these gatherings or even have a "cheat day" where they eat whatever they want without feeling guilty, since they can make up for the excess calories on their low-calorie days.
There is no concrete rule or study that dictates the most effective way to alternate or spread out calorie consumption. How to vary calorie intake is largely up to personal discretion.
Depending on a person's activity, it is generally recommended that the high-calorie and low-calorie days vary by approximately calories, where the high-calorie day is often the number of calories a person needs to consume to maintain their current weight.
For a person with a higher activity level, the calorie difference should be larger. The calculator presents two zigzag diet schedules. The first schedule has two higher calorie days and five lower calorie days. The second schedule increases and reduces calories gradually.
In either case, the total weekly calorie consumption is the same.
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