🍎 Calorie Calculator

How Many Calories Do You Need Per Day?

Your daily calorie requirement — called your Total Daily Energy Expenditure (TDEE) — is the total number of calories your body burns in 24 hours, accounting for both your resting metabolism and all physical activity. Knowing your TDEE is the starting point for any evidence-based nutrition strategy, whether you're trying to lose weight, gain muscle, or simply maintain good health.

This calculator uses the Mifflin-St Jeor equation, which is the most accurate BMR formula validated in peer-reviewed research for the general population. It first estimates your Basal Metabolic Rate (BMR) — the calories burned at complete rest — then multiplies by an activity multiplier to account for your lifestyle and exercise habits.

The Mifflin-St Jeor BMR Formula

• Men: BMR = (10 × weight in kg) + (6.25 × height in cm) − (5 × age) + 5
• Women: BMR = (10 × weight in kg) + (6.25 × height in cm) − (5 × age) − 161

This result is then multiplied by an activity factor: Sedentary (×1.2), Light Activity (×1.375), Moderate (×1.55), Active (×1.725), or Very Active (×1.9) to give your TDEE.

Calorie Goals for Different Objectives

• Maintenance (TDEE): Eating at your TDEE keeps your weight stable. This is the baseline for all calorie targets.
• Moderate Weight Loss (−500 cal/day): Creates a weekly deficit of 3,500 calories — roughly equivalent to 1 pound (0.45 kg) of fat. This is the most commonly recommended rate for sustainable fat loss without significant muscle loss.
• Aggressive Weight Loss (−750 cal/day): Produces approximately 1.5 lb/week loss. Suitable for people with higher initial body fat, but should be paired with adequate protein to preserve muscle mass.
• Muscle Gain (+250–500 cal/day): A caloric surplus of 250–500 calories/day, combined with progressive resistance training, supports muscle growth while minimizing unnecessary fat gain.
• Recomposition (maintenance calories): Eating at TDEE while training with weights can produce simultaneous fat loss and muscle gain in beginners and returning athletes, though progress is slower than focused cutting or bulking phases.

Activity Level Guide

Choosing the right activity multiplier is crucial — most people underestimate this:

• Sedentary (×1.2): Desk job, no intentional exercise. Rare for truly active people to fall here.
• Lightly Active (×1.375): 1–3 workouts per week of moderate intensity (walking, light gym sessions).
• Moderately Active (×1.55): 3–5 workouts per week. Most gym-going adults with active jobs fit here.
• Very Active (×1.725): 6–7 intense workouts per week, physically demanding job, or amateur athlete.
• Extra Active (×1.9): Twice-daily training, professional athlete, or extremely physically demanding work (construction, military training).

Why the Numbers Are Estimates

TDEE calculators are accurate within ±15–20% for most people, but individual variation is real. Hormonal conditions (thyroid disorders, PCOS), medications, gut microbiome, and genetics all affect metabolism. Track your calorie intake for 2–3 weeks while weighing yourself daily (average weekly to smooth fluctuations). If weight doesn't change, your TDEE matches your intake. Adjust based on observed results, not just the calculator output.

The Role of Protein, Carbs, and Fat

Total calories determine weight change, but macronutrient distribution affects body composition, energy, and satiety. A general starting framework for most active adults:

• Protein: 0.7–1.0g per pound of bodyweight (or 1.6–2.2g per kg). Non-negotiable for muscle preservation during fat loss.
• Fat: Minimum 0.3g per pound (0.6g/kg) to support hormonal function. Don't go too low.
• Carbohydrates: Fill remaining calories. Primary fuel for high-intensity exercise and brain function.

Frequently Asked Questions

Why do I stop losing weight despite a calorie deficit? Several factors cause this: metabolic adaptation (your body becomes more efficient as you lose weight), decreased movement (NEAT — non-exercise activity thermogenesis — unconsciously drops), water retention masking fat loss, and measurement error in tracking. Recalculate your TDEE every 10–15 lbs lost, take a diet break week at maintenance calories periodically, and trust weekly average trends over daily fluctuations.

Can I eat fewer than 1,200 calories to lose weight faster? Very low calorie diets (below 1,200 for women, 1,500 for men) are generally not recommended without medical supervision. They often cause muscle loss, nutritional deficiencies, hormonal disruption, and metabolic adaptation that makes long-term weight maintenance harder. Sustainable 0.5–1% body weight loss per week is more effective long-term.

Do I need to count calories forever? No. Most people find that 4–12 weeks of consistent tracking builds an accurate intuitive sense of portions and calorie density. Many successful long-term maintainers "eyeball" portions and return to tracking briefly if weight trends in the wrong direction.