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Calculate your daily calorie needs (TDEE) and basal metabolic rate (BMR) based on age, weight, height, and activity level.
Your daily calorie requirement is not a fixed number — it is a dynamic figure shaped by your age, sex, height, weight and, most critically, your physical activity level. Our calorie calculator uses the scientifically validated Mifflin-St Jeor equation, currently regarded as the most accurate formula for estimating Basal Metabolic Rate (BMR), then applies an activity multiplier to yield your Total Daily Energy Expenditure (TDEE). Whether your goal is weight loss, muscle gain or maintenance, this number is your nutritional north star.
Calorie management and weight monitoring work hand in hand. If you have not yet checked your Body Mass Index (BMI), we recommend doing so first — your BMI provides essential context for interpreting your calorie needs and setting realistic, healthy goals. Together, these two metrics form the core of any evidence-based nutrition plan.
Hydration is another dimension of health that calorie counters often overlook. Water plays a crucial role in metabolism and satiety. Our Daily Water Intake Calculator can determine the ideal amount of water to complement your dietary plan — because true wellness is always holistic.
How is daily calorie need calculated?
Daily calorie requirements are estimated using the Harris-Benedict equation (updated by Mifflin-St Jeor in 1990), which calculates your Basal Metabolic Rate (BMR) — the calories your body burns at complete rest — and then multiplies by an activity factor to get your Total Daily Energy Expenditure (TDEE). For men: BMR = 10 × weight(kg) + 6.25 × height(cm) − 5 × age + 5. For women: BMR = 10 × weight − 6.25 × height − 5 × age − 161. Activity multipliers range from 1.2 (sedentary) to 1.9 (very active athlete). This calculator uses the Mifflin-St Jeor formula, which is considered the most accurate for the general population.
Calorie deficit and surplus: the science of weight change
One kilogram of body fat contains approximately 7,700 kilocalories. A sustained daily deficit of 500 kcal therefore produces roughly 0.5 kg of fat loss per week — a rate considered both safe and physiologically sustainable. Going below 1,200 kcal (women) or 1,500 kcal (men) risks muscle loss, nutrient deficiencies and metabolic adaptation. Always pair calorie tracking with BMI monitoring and adequate hydration for sustainable results.