Introduction
This calorie counter calculator does two jobs. First, it tells you how many calories you need each day to stay at your current weight. Second, it lets you log the food you eat and track your protein, carbs, and fat.
To start, enter your gender, age, weight, height, and how active you are. The tool uses the adult Estimated Energy Requirement (EER) equations from the Institute of Medicine's 2005 report to find your daily calorie needs, also called your TDEE. The National Academies published replacement EER equations in 2023, which this calculator does not yet use.7 You will also see targets for losing or gaining weight, plus a step-by-step look at the math.
Next, use the food logger. Search over 80 foods and restaurant menu items, pick your serving size, and add it to breakfast, lunch, dinner, or snacks. The dashboard shows your calories, protein, carbs, fat, fiber, sugar, sodium, cholesterol, and saturated fat as you go. Charts show where your calories come from and which meals add up the most.
You can switch between pounds and kilograms, and between calories (kcal) and kilojoules (kJ). Use the numbers as a helpful guide, not a medical plan. Talk to a doctor or dietitian before making big diet changes.
How to use our Calorie Counter Calculator
Enter your gender, age, weight, height, and activity level to see how many calories you need each day. Then log the foods you eat to track your calories, protein, carbs, fat, and more.
Measurement units: Pick Imperial (pounds, feet and inches) or Metric (kilograms and centimeters). Your numbers switch over for you.
Energy unit: Choose kcal (Calories) or kJ (kilojoules). All results use the unit you pick.
Gender: Select male or female. The calorie formula uses different numbers for each.
Age: Type your age in years. This tool is built for adults 19 and older.
Weight: Type your current body weight in pounds or kilograms.
Height: Type your height in feet and inches, or in centimeters.
Activity level: Pick the choice that best matches your week: Sedentary, Lightly Active, Moderately Active, or Very Active. Read each short description first.
Calculate and Reset: Press Calculate to see your daily calories, a goal table, step-by-step math, and a chart. Press Reset to start over.
Use This As My Calorie Goal: Click this button, or the "Use" button next to a weight loss or weight gain goal, to send that number to the food log.
Search foods: Type at least 2 letters to find a food, drink, or restaurant menu item. Use the arrow keys and press Enter to pick one.
Quantity: Type how much you ate, like 1 or 2.5.
Serving unit: Choose the serving size you ate, such as 1 ounce, 1 cup, or 100 grams.
Meal: Pick Breakfast, Lunch, Dinner, or Snacks, then click Add to Log.
Daily goals: Type your own goals for calories, protein, carbs, and fat. The bars show how close you are.
Additional nutrients: Open this panel to set goals for fiber, sugar, sodium, cholesterol, and saturated fat.
Popular Foods and Popular Restaurants: Click any tile to load that food fast, or filter the search by one restaurant brand.
Clear All: Click this to empty your food log and start a new day.
What Is a Calorie?
A calorie is a unit of energy. Your body gets calories from the food and drinks you have each day, and it burns them to keep you alive and moving. Even when you sleep, your heart, lungs, and brain use calories. When you eat about the same number of calories that you burn, your weight stays about the same. Eat more, and you gain weight. Eat less, and you lose weight.
Counting Calories to Reach a Goal
Calorie counting means keeping track of the energy in everything you eat and drink. It works because it shows you the real numbers instead of a guess. Most people are surprised by how many calories are in drinks, sauces, oils, and restaurant meals.
The rule that about 3,500 calories equal one pound of body fat is an approximation; it fits people starting with more than 30 kg of body fat and overstates the deficit leaner people need.2 Federal obesity guidance puts a deficit of 500 to 1,000 calories a day at a loss of 1 to 2 pounds per week.3 Eating 500 extra calories a day does the opposite. Slow, steady changes work better and last longer than crash diets.
How Many Calories Do You Burn?
Your total daily energy use is often called TDEE. It comes from three parts:
- Resting energy: the calories your body uses just to stay alive. This is the biggest part.
- Activity: walking, exercise, chores, fidgeting, and standing.
- Digestion: a small amount of energy used to break down food.
Age, sex, height, weight, and how much you move all change the number. Bigger and younger bodies usually burn more. People who move a lot burn more than people who sit most of the day. Muscle matters too, so the Body Fat Calculator is a useful companion.
Macronutrients: Protein, Carbs, and Fat
Calories come from three main nutrients. They are not all the same, and each one has a job in your body.
- Protein: 4 calories per gram.1 Builds and repairs muscle. It also keeps you full longer.
- Carbohydrates: 4 calories per gram.1 Your body's main quick fuel. Whole grains, fruit, beans, and vegetables are good picks.
- Fat: 9 calories per gram.1 Needed for hormones and to soak up some vitamins. Fat has more than twice the calories of the other two, so small amounts add up fast.
Alcohol also has calories but gives your body no nutrients it needs.
Other Numbers Worth Watching
Calories are not the whole story. Fiber helps digestion and keeps you full. Most adults need about 25–38 grams a day.4 Sodium should usually stay under 2,300 mg a day, and much of it hides in packaged and restaurant food.5 Added sugar is best kept low. Saturated fat should be a small slice of your daily fat. Don't forget fluids either.
Tips for Tracking Food
- Weigh or measure food at first. Eyeballing portions leads to big mistakes.
- Log the food right when you eat it, so you do not forget.
- Do not skip drinks, cooking oil, dressings, and snacks.
- Check the serving size on the label. One bag or bottle is often two or three servings.
- Look at weekly averages, not one single day. Daily numbers bounce around.
Eat Enough
Cutting calories too far backfires. You lose muscle, feel tired, and may miss key vitamins. Federal obesity guidance sets supervised low-calorie diets at 1,000 to 1,200 calories a day for most women and 1,200 to 1,600 for men.3 This calculator warns below about 1,200 calories a day for adult women and about 1,500 for adult men, and going below those floors is something to do only with a doctor's help. Body weight on the scale also moves with water, salt, and food in your gut, so it can change by a few pounds in a day for reasons that have nothing to do with fat.
Note: Calorie estimates are starting points, not exact truths. Real needs differ from person to person. Kids, teens, pregnant or nursing people, athletes, and anyone with a health condition should talk with a doctor or a registered dietitian before changing how much they eat.