The calorie deficit calculator tells you how many calories you need to eat daily to lose weight at your chosen pace. It calculates your Total Daily Energy Expenditure (TDEE) based on your age, height, weight, and activity level, then applies a deficit to help you reach your target weight by a specific date.
How to Use the Calorie Deficit Calculator
- Enter your age, height, and current weight.
- Select your activity level (sedentary to very active).
- Enter your goal weight and target date.
- See your recommended daily calorie intake and weekly deficit instantly.
Frequently Asked Questions
What is a calorie deficit?
A calorie deficit means consuming fewer calories than your body burns in a day. When you’re in a deficit, your body draws on stored fat for energy, resulting in weight loss. A deficit of 3,500 calories roughly equals one pound of fat loss, so a 500-calorie daily deficit leads to about 1 lb of weight loss per week.
What’s a safe calorie deficit per day?
A deficit of 500–750 calories per day is generally considered safe and sustainable, resulting in 0.5–1.5 lbs of weekly weight loss. Deficits above 1,000 calories per day can cause muscle loss, nutrient deficiencies, and metabolic slowdown — and are rarely recommended without medical supervision.
What’s the minimum number of calories I should eat?
Most health guidelines recommend no fewer than 1,200 calories/day for women and 1,500 for men, as eating below these thresholds makes it very difficult to meet nutritional needs. Always prioritize adequate protein, vitamins, and minerals regardless of your calorie target.
Why isn’t my weight loss matching the calculator’s prediction?
Several factors can cause discrepancies: metabolic adaptation (your body burns fewer calories as you lose weight), water retention masking fat loss, inaccurate calorie tracking, or overestimating activity level. Weight loss is rarely perfectly linear — track trends over 2–4 weeks rather than day to day.
Should I exercise to create the deficit or just eat less?
Both. A combination of reduced calorie intake and increased physical activity is more sustainable and better for body composition than diet alone. Exercise preserves muscle mass during weight loss and has independent health benefits beyond calorie burn.