Calorie Calculator

About the Calorie Calculator

This Calorie Calculator estimates the number of calories your body needs each day to maintain, lose, or gain weight — based on your age, sex, height, weight, activity level, and personal goals.

It uses the Revised Harris–Benedict Equation, a scientifically validated method for estimating your Basal Metabolic Rate (BMR) — the number of calories your body burns at rest. This equation, first introduced in 1918 and later revised in 1990, is one of the most trusted tools in nutrition science.

Here’s how it works:

• Your BMR is calculated using gender, age, height, and weight.
• This is multiplied by an activity factor to determine your Total Daily Energy Expenditure (TDEE).
• Based on your goal — weight loss, maintenance, or gain — we adjust your daily calorie needs accordingly.

Scientific Reference:
Mifflin MD, St Jeor ST, Hill LA, Scott BJ, Daugherty SA, Koh YO.
A new predictive equation for resting energy expenditure in healthy individuals.
American Journal of Clinical Nutrition, 1990; 51(2):241–247.
doi:10.1093/ajcn/51.2.241

Whether you’re just starting your fitness journey or optimizing your strategy, this calculator provides a data-driven estimate to help you move forward with confidence.