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Blog Nutrition How To Calculate Calorie Deficit And Why It Matters

How To Calculate Calorie Deficit And Why It Matters

calorie calculator to lose weight

A calorie deficit is a difference between the number of calories you consume and the number of calories your body burns. It’s a crucial part of weight management because it determines whether you will lose, maintain, or gain weight. But how do you calculate your calorie deficit? And what does it mean for your health? Let’s find out!


What Is A Calorie?

A calorie is a unit of energy. Your body needs calories, just like your car needs gas. To survive and function normally, the human body requires an intake of at least 1000 to 1200 calories per day. However, this number varies depending on age, sex, and weight loss goals. The average person consumes around 2000-2500 calories per day (8). Calories are burned primarily through bodily processes such as respiration (i.e., breathing), digestion, circulation, muscle movement, etc. 

What Is A Calorie Deficit And Why Does It Matter?

A calorie deficit is a difference between the number of calories you consume and the number you burn. When your calorie intake is less than what you need, then a deficit exists. This results in weight loss because excess calories that are not burned accumulate as stored fat.

Read More: 1200-Calorie Diet Weight Loss Calculator: From Creating A Caloric Deficit To Tracking Your Results

calorie calculator to lose weight

How To Calculate Your Calorie Needs And Deficit

To determine how many calories you should eat each day, figure out first how many calories you require to maintain your current weight (your basal metabolic rate or BMR). To figure out how many calories you burn each day, simply add up all the ways your body expends energy. Three main components that determine how many calories you burn each day:

Resting Energy Expenditure (REE) 

This is the number of calories you burn at rest for basic body functioning, such as breathing and keeping your heart beating. It’s also called basal metabolic rate (BMR). Men typically have a greater REE than women because they are generally larger. People who weigh more will burn more calories at rest. Your REE is a function of both your weight and height, as well as your age (2). 

Thermic Effect Of Food (TEF) 

The thermic effect of food refers to the number of calories you burn digesting and metabolizing food. This accounts for about 10% of your total calorie expenditure. Generally, the more you weigh, the greater your TEF (2). 

Active Energy Expenditure (AEE) 

This refers to physical activity and exercise. This accounts for about 40% of your daily calorie expenditure (2). The amount is determined by what type of work you do, how much time you spend doing it, and how vigorously you perform it. 

To determine your total daily calorie needs, simply add up all three numbers. Be sure to use the same units for all metrics (i.e., calories, pounds). To create a calorie deficit, just reduce your calorie intake to less than your daily needs. This will result in weight loss if you do it over time because you are reducing the number of calories stored as fat. If you are trying to lose weight, it may help if you are more active throughout the day. This will result in additional calories being burned beyond your maintenance levels, leading to weight loss.

how to calculate calorie deficit

How To Achieve A Calorie Deficit?

Calories in vs. calories out are the basic principle of weight management. You can achieve a calorie deficit by consuming fewer calories than you need to maintain your current weight. Or, you can burn extra calories through increased physical activity. Some of the ways to create a deficit are:

Lift Weights 

Strength training is an excellent way to burn extra calories while building lean muscle mass. Muscle burns more calories than fat does, so the more lean muscle mass you have, the better your metabolism will be at burning stored body fat. Furthermore, since lean muscles weigh more than adipose tissue (i.e., fatty tissues), strength training also helps support healthy bone density and optimal organ function (11).  

Reduce Carb Intake 

Removing sugars from your diet can decrease caloric intake significantly. The average adult needs between 50 and 100 grams of carbohydrates per day (10). If you eat 300 grams, then that accounts for about one-third (1/3) of your total caloric intake (which is not ideal). Instead, try reducing your carbohydrate intake to 75 grams or less, which may help reduce body fat.

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how to calculate calorie deficit

Reduce Fat Intake 

First, it helps to understand what types of fats are beneficial and which ones are harmful. Polyunsaturated and monounsaturated fats are considered healthy because they have some proven health benefits. On the other hand, some saturated fats and trans fats have been linked to obesity and inflammation, which contributes to chronic disease (4).

Eat More Fruits And Vegetables

Fruits and vegetables contain fewer calories than other foods. A higher fruit and vegetable intake is associated with increased diet quality, better nutrient status, improved weight management, as well as decreased risk of chronic disease (6). This makes them some of the healthiest choices you can make!

calories per day

How To Sustain A Calorie Deficit For Long-Term Weight Management?

Unfortunately, while it’s possible to lose weight this way, long-term sustained energy deficits are hard for most people. It is common that when people restrict their diets and don’t eat enough calories they will eventually weaken and overeat— leading to a calorie surplus rather than a deficit.

This is because the body responds to the shortage of calories by slowing the metabolism– the rate at which it uses energy. When you eat too little, your body goes into conservation mode, conserving its energy rather than burning it. This is why when people starve themselves for too long they often end up gaining more weight than they started with. 

Here are some helpful tips to follow while restricting calories to lose weight:

Choose A Sustainable Deficit  

As a general rule, calorie deficits should be between 500 and 1000 calories per day (7). This is a sustainable caloric deficit that won’t force your body to lose lean mass or burn precious muscle. Weight loss of a pound per week is an ideal rate for most women and men. 

Restricting yourself too much is not sustainable because most people cannot maintain that type of diet for long periods. If calorie restriction is too low or high, then the body responds with hunger cravings and hormone imbalances (e.g., cortisol), which can lead to overeating and/or loss of lean tissue (3).

Read More: Caloric Deficit: What Is It And How To Create One Safely

caloric deficit calculator

Eat Mindfully To Satiety

Eat slowly and stop when you’re no longer hungry. When you feel more satisfied, it may also be easier to avoid high-calorie processed foods. Pay attention to your eating habits and develop mindfulness of what, why, and how much you eat. 

Don’t Skip Meals

Skipping meals makes it easy to overeat later on because you’re already hungry. Plus, by the time your next meal rolls around, you may have low blood sugar (i.e., hypoglycemia), which can lead to headaches and mood swings (9). This is one of the most common causes of “binge eating” late at night. So, don’t skip meals and control your portions instead.

Limit Your Alcohol Intake 

Alcohol contains many calories per gram, causing drinkers to consume more food (i.e., it’s a “food pusher”). Plus, alcohol can affect judgment and self-control when it comes to eating/drinking; the person may unknowingly consume more than usual (1).

Limit Caffeine Intake

Limit caffeine intake to one cup per day. Caffeine is a stimulant that can affect your energy levels, mental acuity, and overall health when consumed in large amounts. Overconsumption may also contribute to insomnia, anxiety, and chronic stress. The recommended safe range for daily caffeine consumption is 100-200 milligrams, so try to stick within this range (12).

calories to lose weight

Manage Stress

Consider acupuncture and massage therapy. These complementary therapies can help reduce stress levels, increase endorphin production (which helps you feel good), and improve the body’s natural detoxification process. Some people also claim that they’re a great way to lose weight because they “stimulate the metabolism,” but no evidence has been published in peer-reviewed journals to support this claim.

Risks Of Eating Too Few Calories

There are several risks associated with eating too little food, including nutrient deficiency, slower metabolism, lethargy, and the risk of gallstones.

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Nutrient Deficiency

When you don’t eat enough calories to meet your energy needs, it can negatively affect the body’s ability to function properly. For example, nutrient deficiencies may result if your calorie intake is so low that it doesn’t support normal metabolic processes or physical activity levels. Furthermore, insufficient amounts of calories can lead to loss of lean muscle mass, which leads to a reduction in metabolic rate (3). As a result, the number on the scale might not change much or even increase, and you may feel tired and weak all the time. 

Slower Metabolism

When your calorie intake is too low, it can slow down your metabolism (i.e., the rate at which your body converts food into energy). This reduction in metabolic rate means that it will be harder to lose weight. Furthermore, a slower metabolism means less physical activity, which means fewer calories burned throughout the day. As a result of this poor diet and inactive lifestyle, some people who engage in crash diets end up gaining more weight than they lost in the first place.

food calories calculator


Eating too few calories can leave you feeling lethargic or exhausted, which makes exercise difficult or impossible, making it even more challenging to reduce your calorie intake over time (3). 

Risk Of Gallstones

The body stores fat in the liver as well as around the waist, hips, and thighs. When your calorie intake drops too low, it can prevent these fatty deposits from being metabolized normally because of the lack of sufficient energy. This may lead to gallstones or other health issues (5).

The Bottom Line

Calorie deficits are often required for weight loss. Certain diets, such as intermittent fasting, can help you create a calorie deficit without counting calories or weighing food portions. However, if your goal is to maintain your current weight or reduce your caloric intake by 500 or more calories per day on an ongoing basis, then these methods are probably not feasible long-term. The best way to achieve a sustainable calorie deficit is through eating less and exercising more— consistently over time.



This article is intended for general informational purposes only and does not address individual circumstances. It is not a substitute for professional advice or help and should not be relied on to make decisions of any kind. Any action you take upon the information presented in this article is strictly at your own risk and responsibility!


  1. Alcohol Use and Your Health (2021,
  2. A review: exercise and its influence on resting energy metabolism in man (1989,
  3. Caloric Restrictions in Humans: Impact on Physiological, Psychological and Behavioral Outcomes (2011,
  4. Effect of reducing total fat intake on body weight: systematic review and meta-analysis of randomised control trials and cohort studies (2012,
  5. Gallstone formation and weight loss (1993,
  6. Health Benefits of Fruits and Vegetables (2012,
  7. Healthy weight loss (2014,
  8. How Many Calories Should You Eat Per Day? (2019,
  9. Hypoglycemia rebound migraine (2001,
  10. Low Carbohydrate Diet (2021,
  11. Resistance training is medicine: effects of strength training on health (2012,
  12. The Safety of Ingested Caffeine: A Comprehensive Review (2017,

Zindzy is a freelance writer who specializes in creating web content in the health & wellness niche. The articles she writes focus on providing factual information – but never at the expense of providing an entertaining read.
Her interest in health & wellness was sparked by her motherhood journey. She realized just how much damage misinformation could cause, especially when it is targeted at new moms who are keen on postpartum weight loss.
So for years, she has worked hard to demystify the seemingly complex concepts of health & wellness. Eventually, she made one startling discovery that she wishes to share with all – there is no short cut. Consistency and hard work are the keys to a healthy mind and body.
But, writing is not all she does. Being a mother to an energetic toddler means her free time is spent exploring the outdoors, arms laden with cotton candy and toys. Through the daily intrigues of work and play, she continues to discover and share more ways to keep fit and stay healthy!

J. Paul

Jovial is from Dubai, and is a Head EMS Instructor/Fitness Manager/Nutrition Consultant for REMS Fitness. He is certified by the Gold’s Gym Fitness Institute and Registered as a Gym Instructor.
Jovial specialises in HIIT training, Rehabilitation/injury recovery, Strength and Conditioning, Kickboxing, Body Weight Training and Weight Training, and practices each discipline himself. His approach is to focus on improving his clients’ lifestyle by motivating them and setting an example.

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