๐ฅ Calorie Calculator
Get your daily calorie needs, BMR, and macro breakdown
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Get your daily calorie needs, BMR, and macro breakdown
Your daily calorie requirement depends on two key factors: your Basal Metabolic Rate (BMR) and your activity level. BMR represents the calories your body burns at complete rest โ just to keep your heart beating, lungs breathing, and cells functioning. When multiplied by an activity factor, you get your Total Daily Energy Expenditure (TDEE), which represents the total calories you burn in a typical day including exercise and daily movement.
Our calculator uses the Mifflin-St Jeor equation, which research has shown to be the most accurate BMR prediction formula for most adults. Published in 1990, it calculates BMR as: (10 ร weight in kg) + (6.25 ร height in cm) - (5 ร age) + 5 for males, or - 161 for females. This equation replaced the older Harris-Benedict equation (1919) and has been validated across multiple studies as producing estimates within 10% of actual measured metabolic rates for most people.
Macronutrients are the three main sources of dietary energy. Protein (4 calories per gram) is essential for muscle repair, immune function, and hormone production. Carbohydrates (4 calories per gram) are the body's preferred energy source, fueling the brain and muscles during exercise. Fat (9 calories per gram) supports hormone production, nutrient absorption, and cell membrane integrity. The optimal ratio varies by goal: fat loss benefits from higher protein intake (to preserve muscle), while endurance athletes typically need more carbohydrates.
A safe rate of weight loss is generally 0.5 to 1 kg (1-2 lbs) per week, which requires a daily deficit of 500-1000 calories below your TDEE. Losing weight faster than this often means losing muscle mass rather than fat, which slows your metabolism and makes regaining weight more likely. For muscle gain (bulking), a modest surplus of 200-400 calories above TDEE is recommended. Larger surpluses tend to add excess fat without speeding up muscle growth. Consistency over weeks and months matters far more than daily perfection.
Proper hydration is essential for metabolism, digestion, and overall health. A general guideline is to drink approximately 33ml of water per kilogram of body weight daily. This means a 75kg person should aim for about 2.5 liters per day. However, needs increase with exercise, hot weather, altitude, and high-protein diets. Signs of adequate hydration include pale yellow urine and rarely feeling thirsty. While caffeinated drinks do contribute to fluid intake, water remains the ideal choice for consistent hydration throughout the day.
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