Calorie Calculator

Understanding Your Calorie Needs

Calorie requirements vary based on multiple factors including age, gender, weight, height, and physical activity level. This calculator uses the Mifflin-St Jeor equation, which is considered one of the most accurate methods for estimating calorie needs.

Calculation Method

Mifflin-St Jeor Equation:

For Men: BMR = (10 × weight in kg) + (6.25 × height in cm) - (5 × age) + 5

For Women: BMR = (10 × weight in kg) + (6.25 × height in cm) - (5 × age) - 161

TDEE: BMR × Activity Multiplier

Key Terms Explained

• BMR (Basal Metabolic Rate): Calories burned at complete rest, just to keep your body functioning
• TDEE (Total Daily Energy Expenditure): Total calories burned in a day including all activities
• Calorie Deficit: Eating fewer calories than TDEE to lose weight (typically 500 cal/day = 1 lb/week)
• Calorie Surplus: Eating more calories than TDEE to gain weight/muscle

Activity Level Guide

• Sedentary: Desk job, minimal exercise
• Lightly Active: Light exercise 1-3 days/week
• Moderately Active: Moderate exercise 3-5 days/week
• Very Active: Intense exercise 6-7 days/week
• Extra Active: Very intense daily exercise + physical job

Weight Management Tips

For Weight Loss:

• Create a moderate calorie deficit (500-750 calories/day)
• Aim for 0.5-1 kg (1-2 lbs) weight loss per week
• Focus on nutrient-dense, whole foods
• Maintain adequate protein intake (preserves muscle)
• Stay hydrated and get enough sleep

For Weight Gain:

• Create a moderate calorie surplus (300-500 calories/day)
• Focus on lean muscle gain, not just weight
• Combine with resistance training
• Eat protein-rich foods
• Be consistent with meals

Macronutrient Balance

Beyond total calories, consider macronutrient distribution:

• Protein: 0.8-2g per kg body weight (muscle building/preservation)
• Fats: 20-35% of total calories (hormone production, absorption)
• Carbohydrates: Remaining calories (energy, performance)

FAQ

Q: How accurate is this calculator?
A: The Mifflin-St Jeor equation is considered one of the most accurate formulas, with about 90% accuracy for most people. Individual variations exist.

Q: Should I eat exactly this many calories every day?
A: This is a guideline. It's okay to have some variation day-to-day. Focus on weekly averages.

Q: Why am I not losing weight at this calorie level?
A: Weight loss can plateau due to metabolic adaptation, inaccurate tracking, or other factors. Consider consulting a healthcare provider.

Q: Do I need to count calories forever?
A: Many people find that tracking initially helps them learn portion sizes and food composition, then they can maintain without strict counting.