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Calorie Deficit Calculator — Weight Loss Timeline & Fat Loss Rate
Calculate exact daily calorie targets and projected weeks to reach your target body weight.
Parameters & Body Metrics
Health & Fitness Targets
Evidence-BasedEnter your parameters above to compute your target metrics.
Calorie Deficit & Weight Loss Timeline Formula
Transparent mathematical methodology explained in plain English.
Target Calories = Maintenance TDEE - Deficit (500 kcal = ~1 lb/wk | 1,000 kcal = ~2 lb/wk)Based on the metabolic rule where a cumulative 3,500 kcal deficit equates to approximately 1 pound (0.45 kg) of adipose fat loss.
Variables Explained:
- Current Weight (kg / lbs): Starting body weight.
- Goal Weight (kg / lbs): Target body weight.
- Daily Deficit (kcal): Calorie reduction below maintenance (typically 300 to 750 kcal/day).
Lose 20 lbs (From 195 lbs to 175 lbs) with 500 kcal/day Deficit (TDEE: 2,500 kcal)
Calculating daily calorie target and weeks to target goal.
- Daily Calorie Target: 2,500 - 500 = 2,000 kcal/day.
- Weekly Deficit: 500 × 7 = 3,500 kcal = 1.0 lb fat loss per week.
- Total Weight to Lose: 20 lbs.
- Estimated Timeline: 20 lbs / 1.0 lb/wk = 20 Weeks (~4.6 Months).
Frequently Asked Questions: Calorie Deficit Calculator
Click any question below to expand quick answers, formulas, and expert tips.
What is a safe and sustainable rate of weight loss?
Losing 0.5% to 1.0% of total body weight per week (typically 1 to 2 pounds per week) is clinically recommended to maximize fat loss while preserving lean muscle mass.
What is metabolic adaptation during prolonged dieting?
As you lose weight, your body burns fewer calories because of reduced body mass and subconscious drops in Non-Exercise Activity Thermogenesis (NEAT), requiring periodic maintenance refeeds.