How a Calorie Calculator Works

A calorie calculator is a simple tool that estimates how many calories your body needs each day to maintain, lose, or gain weight. It uses basic information such as your age, gender, weight, height, and activity level to determine your energy requirements.

The calculator first estimates your Basal Metabolic Rate (BMR)—the calories your body burns at rest to support essential functions like breathing and circulation. Then, it adjusts this number based on your activity level, from sedentary to highly active, to calculate your total daily energy expenditure (TDEE).

Using a calorie calculator helps you make informed choices about how much to eat. By knowing your daily needs, you can set realistic goals, manage portions, and balance your diet without unnecessary guesswork. It’s a practical starting point for anyone looking to maintain a healthy weight or improve overall nutrition.