Calorie Calculator
Find your daily calorie needs for any goal — weight loss, maintenance, or muscle gain. Works in metric or imperial units for anyone, anywhere in the world.
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Frequently Asked Questions
How This Calorie Calculator Works
This calculator uses the Mifflin-St Jeor equation, the most widely validated formula for estimating daily calorie needs in healthy adults. It calculates your Basal Metabolic Rate — the calories your body burns at complete rest — then multiplies that by an activity factor to estimate your Total Daily Energy Expenditure. From there, it adjusts up or down based on your selected goal.
To use the calculator, enter your age, height, weight, and activity level, then select your goal. The results show your BMR, your maintenance calories, and your personalized daily calorie target. You also get a breakdown by day, week, month, and year, plus a suggested macro split showing how to distribute your calories across protein, carbohydrates, and fat.
Understanding Your Results
BMR is the number of calories your body needs at absolute rest — if you stayed in bed all day. It covers breathing, circulation, organ function, and cell repair. For most adults this falls between 1,200 and 2,000 calories per day depending on body size.
TDEE (Total Daily Energy Expenditure) is your actual daily calorie burn including all physical activity. Eating at your TDEE will maintain your current weight. Eating below it creates a calorie deficit that leads to fat loss; eating above it creates a surplus that supports muscle gain.
The 500 calorie rule: A deficit or surplus of approximately 500 calories per day leads to roughly 0.45 kg (1 lb) of weight change per week. This is a widely used guideline based on the principle that 1 lb of body fat contains approximately 3,500 calories.
Calorie Targets by Goal
The calculator shows five goal targets simultaneously so you can compare your options. Losing weight fast requires a 1,000 calorie daily deficit, which produces approximately 0.9 kg (2 lbs) of loss per week but may be difficult to sustain. Moderate weight loss at a 500 calorie deficit is generally considered safer and more sustainable. Maintenance keeps your weight stable. Gaining muscle requires a modest surplus of 250 to 500 calories above TDEE combined with resistance training.
Note that extremely low calorie targets — below 1,200 for women or 1,500 for men — are generally not recommended without medical supervision, as they can lead to nutrient deficiencies and metabolic adaptation. This calculator shows all targets for reference, but always consult a healthcare professional before making significant dietary changes.
About Macros
The suggested macro split gives you a starting point for distributing your calories across the three macronutrients. Protein supports muscle maintenance and satiety. Carbohydrates provide energy for daily activity and exercise. Fat supports hormone production and nutrient absorption. The percentages adjust automatically based on your selected goal — higher protein for weight loss and muscle gain, higher carbohydrates for maintenance and weight gain. These are guidelines, not prescriptions; individual needs vary based on health status, activity type, and personal preference.