Calorie Deficit Calculator

What's My Deficit?

Enter your stats and weight goal, and we'll calculate your exact daily calorie target — backed by the Mifflin-St Jeor formula used by registered dietitians.

About You
ft
in
Your Goal
Pick a date
Activity Level
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Your Daily Calorie Target
Eat this many calories per day
calories / day
Maintenance Moderate Aggressive ⚠ Extreme
BMR (cal/day)
TDEE (cal/day)
Daily Deficit (cal)
Est. lbs / week
Days to Goal
Total to Lose
Body Mass Index (BMI)
<18.5 Underweight 18.5–24.9 Normal 25–29.9 Overweight 30–34.9 Obese 35+ Severely Obese
🧬 Important limitation: BMI does not account for muscle mass, bone density, or body composition. A muscular athlete may show as "Overweight" or "Obese" while having very little body fat. Use BMI as one data point among many — not as a definitive measure of health.
Deficit Assessment
Suggested Daily Macros

Based on your calorie target, here's a balanced macro split optimized to preserve muscle while in a deficit.

—g
Protein
—g
Carbs
—g
Fat

Protein kept high (1g per lb of goal body weight) to minimize muscle loss. Carbs and fat split 50/50 of remaining calories.