Caloric Deficit Calculator
Daily calorie target and weight loss/gain timeline
Daily Calorie Target
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Frequently Asked Questions
What is a caloric deficit?
A caloric deficit means eating fewer calories than your TDEE. Since your body needs energy, it draws on stored fat to make up the difference. A deficit of 3,500 calories over time leads to approximately 1 lb of fat loss.
How big should my caloric deficit be?
A 500 cal/day deficit (1 lb/week) is the standard recommendation — aggressive enough for results, conservative enough to preserve muscle and sustain long-term. A 20–25% deficit is the practical safe maximum for most people.
Will a large deficit lose weight faster?
A very large deficit (>1,000 cal/day) increases muscle loss, slows metabolism, causes fatigue, and is hard to sustain. Studies show moderate deficits result in similar fat loss to aggressive ones but preserve more muscle.
Should I eat back exercise calories?
If your TDEE already includes your activity level, no. If you used BMR as your base and are adding exercise on top, add back 50–75% of estimated exercise calories, since burn estimates from exercise are often inflated.
Deficit Size Guide
Mild, very sustainable
Moderate, recommended
Aggressive, short-term
Limit — monitor health
Don't Know Your TDEE?
Calculate your maintenance calories first, then come back here.
Calculate TDEE →Minimum Safe Calories
Going below these thresholds long-term risks muscle loss and metabolic adaptation.
What is a Caloric Deficit?
A caloric deficit occurs when you consume fewer calories than your body burns in a day (your TDEE). To compensate for the energy shortfall, your body draws on stored energy — primarily body fat — resulting in weight loss over time.
The relationship is straightforward: 1 lb of body fat contains approximately 3,500 calories. A daily deficit of 500 calories creates a weekly deficit of 3,500 calories, leading to ~1 lb of fat loss per week. This estimate is approximate — actual results vary by individual metabolism, muscle mass, and hormonal factors.
Why Moderate Deficits Win Long-Term
Preserves muscle mass
Aggressive deficits (>750 cal/day) cause your body to break down muscle for energy. Moderate deficits combined with protein intake and resistance training preserve lean mass.
Sustainable adherence
Crash diets are abandoned 85% of the time within weeks. A mild deficit of 250–500 cal/day is barely noticeable in daily life, making it far easier to maintain.
Prevents metabolic adaptation
Severely cutting calories triggers metabolic slowdown — your TDEE drops in response. Moderate deficits and diet breaks prevent this adaptation.
Better mood and energy
Large deficits cause fatigue, brain fog, irritability, and poor sleep — all of which sabotage compliance. Moderate deficits have minimal impact on daily energy.
How to Break a Weight Loss Plateau
As you lose weight, your TDEE decreases — your body needs fewer calories to maintain a smaller frame. This is why fat loss often stalls after several weeks. The math hasn\'t broken; your target calories need to be recalculated.