Calorie Calculator

Most adults need between 1,600 and 3,000 calories per day depending on age, sex, height, weight, and activity level. Women typically require 1,600–2,400 calories while men need 2,000–3,000 calories. Use a calorie calculator based on the Mifflin-St Jeor or Harris-Benedict equation to get a personalized daily target.

Enter your age, sex, height, weight, and physical activity level into a calorie calculator to estimate your Total Daily Energy Expenditure (TDEE). The calculator multiplies your Basal Metabolic Rate (BMR) by an activity factor to determine how many calories you burn each day. From there, you can adjust the number up or down based on your weight goal.

To lose weight safely, aim for a calorie deficit of 500–750 calories per day below your TDEE, which typically results in about 0.5–1.5 pounds of fat loss per week. Most health guidelines recommend not dropping below 1,200 calories per day for women or 1,500 for men. Pairing a moderate deficit with regular exercise produces the best long-term results.

Basal Metabolic Rate (BMR) is the number of calories your body burns at complete rest just to maintain basic functions like breathing and circulation. TDEE — Total Daily Energy Expenditure — adds the calories burned through daily activity, exercise, and digestion on top of your BMR. TDEE is the number you should use as a baseline when setting a calorie intake goal.

To build muscle (bulk), you generally need to eat 250–500 calories above your TDEE per day, which is known as a caloric surplus. Combining a surplus with a high-protein diet (0.7–1 gram of protein per pound of body weight) and a consistent resistance training program maximizes muscle growth while minimizing excess fat gain.

Yes — activity level is one of the biggest factors in determining daily calorie needs, often accounting for a 30–100% difference between sedentary and very active individuals. A sedentary person multiplies their BMR by roughly 1.2, while a highly active athlete may multiply it by 1.725 or more. Accurately selecting your activity level is critical to getting a useful calorie target from any calculator.

Online calorie calculators based on the Mifflin-St Jeor equation are accurate within 10% for most people, making them a reliable starting point. Individual factors like genetics, muscle mass, hormonal health, and gut microbiome can shift your true calorie needs above or below the estimate. It is best to treat the result as a starting target, track your weight for 2–3 weeks, and adjust your intake up or down as needed.