Calorie Calculatorحاسبة السعرات الحرارية
Estimate your daily calorie needs to maintain, lose, or gain weight.قدّر احتياجك اليومي من السعرات للحفاظ على وزنك أو خسارته أو زيادته.
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How this calorie calculator works
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This tool estimates your Total Daily Energy Expenditure (TDEE) using the Mifflin-St Jeor equation, widely regarded by dietitians as more accurate than older formulas like Harris-Benedict. It first calculates your Basal Metabolic Rate (BMR) — the energy your body burns at complete rest just to keep organs functioning — then multiplies it by an activity factor that reflects how much you move in a typical week.
For men: BMR = 10 × weight(kg) + 6.25 × height(cm) − 5 × age + 5. For women: BMR = 10 × weight(kg) + 6.25 × height(cm) − 5 × age − 161. The activity multipliers range from 1.2 for a mostly sedentary lifestyle up to 1.9 for athletes training twice a day. Multiplying BMR by that factor gives your maintenance calories — the number you'd eat to keep your current weight stable.
From there, the calculator applies the common rule of thumb that one kilogram of body fat stores roughly 7,700 kcal, so a daily deficit of about 500 kcal produces close to 0.5 kg of loss per week, and 1,000 kcal roughly 1 kg per week. The same logic applies in reverse for weight gain. Keep in mind these are estimates: individual metabolism, muscle mass, sleep, stress, and medication can all shift real-world results. Re-check the numbers every few weeks as your weight changes, since your maintenance calories shift along with it, and avoid extreme deficits for long periods without professional guidance.