Calorie Deficit Calculator

How a Calorie Deficit Leads to Weight Loss

Weight loss happens when you consume fewer calories than your body burns. This calculator estimates your daily maintenance calories (TDEE) based on your BMR and activity level, then subtracts the deficit needed to reach your weekly weight loss goal.

What Do BMR and TDEE Mean?

• BMR (Basal Metabolic Rate): Calories burned at complete rest — breathing, circulation, cell repair.
• TDEE (Total Daily Energy Expenditure): Your BMR multiplied by your activity level — the calories you need to maintain your current weight.

How Much of a Deficit Should You Choose?

• 0.25 kg/week: Very gentle, great for beginners.
• 0.5 kg/week: The most common and sustainable choice.
• 1 kg/week: Aggressive — only if you have higher body fat and feel comfortable.

Important: Do not go below 1,200 calories/day (women) or 1,500 (men) without medical supervision. The calculator floors at 1,200 to encourage safe, sustainable weight loss.

Tips to Stay Full While in a Deficit

• Prioritize protein at every meal.
• Eat high-volume foods like vegetables and fruits.
• Drink enough water — thirst often feels like hunger.
• Plan meals ahead to avoid overeating.

Common Mistakes to Avoid

• Choosing a deficit that’s too large (leads to fatigue + cravings).
• Ignoring liquid calories (coffee drinks, juices, alcohol).
• Underestimating portion sizes.

Pair this tool with our BMI Calculator and Body Fat % Estimator to track your progress from both weight and body composition perspectives.

Disclaimer: This is for educational purposes. Consult a doctor or dietitian before starting any weight loss program.