How Many Calories Should I Eat Per Day?

The number of calories you need each day depends on your age, sex, height, weight, and how active you are. Eating too many leads to weight gain over time. Eating too few can leave you tired, hungry, and losing muscle along with fat. This guide explains how to find the right number for your specific situation and goal.

General Daily Calorie Guidelines

The USDA guidelines give broad estimates by age, sex, and activity level. Decent starting point, but your actual needs vary.

Sedentary means mostly sitting throughout the day with no intentional exercise. Moderately active means walking 1.5 to 3 miles per day or equivalent activity. Active means walking more than 3 miles per day or doing equivalent exercise.

How Your Body Burns Calories

Your total daily energy expenditure (TDEE) is the total number of calories your body burns in a day. It has three components:

Basal metabolic rate (BMR) accounts for 60-75% of your daily burn. This is the energy your body uses just to keep you alive: breathing, circulating blood, maintaining body temperature, and running your organs. Even if you lay in bed all day, your body would still burn this many calories.

Thermic effect of food (TEF): about 10% of your daily burn goes to digesting food. Your body uses energy to break down and process the food you eat. Protein has the highest thermic effect (20-30% of its calories are used in digestion), followed by carbs (5-10%) and fat (0-3%).

Physical activity accounts for 15-30% of your daily burn. This includes both intentional exercise and non-exercise activity like walking around the office, doing chores, or fidgeting (sometimes called NEAT, or non-exercise activity thermogenesis).

Calories for Weight Loss

To lose weight, you need to eat fewer calories than you burn, creating a calorie deficit. A deficit of about 500 calories per day leads to roughly one pound of fat loss per week. A deficit of 750 to 1,000 calories per day leads to 1.5 to 2 pounds per week, which is generally considered the maximum safe rate of weight loss.

For most people, that means 1,500-2,000 calories/day to lose weight, depending on your TDEE. Going below 1,200 (women) or 1,500 (men) without a doctor watching isn't recommended, as it becomes difficult to get adequate nutrition at very low intake levels.

A moderate deficit (300-500 calories) combined with exercise is what actually works long term. You keep muscle, keeps energy levels stable, and is much easier to maintain long-term than aggressive restriction.

Calories for Muscle Gain

Building muscle requires a calorie surplus, meaning you eat more than you burn. A surplus of 250 to 500 calories per day is enough to support muscle growth when combined with resistance training. Eating significantly more than this doesn't build muscle faster; it just adds more body fat.

Protein intake matters as much as total calories for muscle building. Most research supports eating 0.7 to 1.0 grams of protein per pound of body weight per day when training for muscle growth. Our Protein Calculator can help you find the right amount.

Calories for Maintenance

If your weight has been stable for several months, you're probably already eating at maintenance. Your maintenance level is your TDEE, the number of calories that keeps your weight steady over time. This is the baseline you adjust from, whether your goal is to lose fat or gain muscle.

Easiest way to find your maintenance calories: track everything you eat for 2 weeks while keeping your weight stable. The average daily intake over that period is a good estimate of your maintenance level. Alternatively, use our Calorie Calculator for an estimate based on established formulas.

Why Calorie Counting Is Not Always Necessary

Calorie counting works, but it's not the only way. Plenty of people stay at a healthy weight by just eating real food and paying attention to hunger signals. Focusing on whole foods (vegetables, fruits, lean proteins, whole grains, nuts, and seeds) naturally regulates calorie intake because these foods are more filling per calorie than processed foods.

If the idea of tracking every bite stresses you out, consider these simpler approaches: fill half your plate with vegetables at each meal, eat protein at every meal, limit liquid calories (soda, juice, alcohol), and eat slowly enough to notice when you feel full. These habits address the most common causes of overeating without requiring a food scale.

Common Calorie Myths

"Eating after 8 PM makes you gain weight." No. Weight gain comes from eating more calories than you burn over time, regardless of when you eat them. Late-night eating is associated with weight gain only because people tend to snack on high-calorie foods in the evening, not because of the time itself.

"You need to eat breakfast to boost your metabolism." Not necessarily. Skipping breakfast doesn't slow your metabolism. What matters is your total daily intake. Some people do better with breakfast; others thrive with intermittent fasting. Do what works for your schedule and hunger patterns.

"All calories are equal." A calorie is a unit of energy, and in that sense, all calories are equal. But the source of those calories matters for how full you feel, how your body processes them, and your overall health. 200 calories of chicken breast will keep you full much longer than 200 calories of candy.

For more on this topic, see our protein guide.

For more on this topic, see our BMI chart guide.

For more on this topic, see our body fat percentage guide.

Sources

U.S. Department of Agriculture (USDA): Dietary Guidelines for Americans 2020-2025
National Academy of Medicine: Dietary Reference Intakes for energy and macronutrients
Mifflin MD, St Jeor ST, et al.: Original Mifflin-St Jeor equation (Am J Clin Nutr, 1990)

Related Tools

Get your daily calorie target with the Calorie Calculator, break it into protein, carbs, and fat with the Macro Calculator, find your ideal protein intake with the Protein Calculator, or check your BMI with the BMI Calculator.