Calculate your optimal protein, carbs, and fat macros for weight loss. Free macro calculator based on your goals and body stats. No signup.
Total calories determine whether you lose or gain weight — but macros determine how much of that weight change is fat versus muscle. High protein intake during a calorie deficit preserves muscle mass and keeps you fuller. This calculator shows your ideal protein, carbs, and fat targets for your specific weight loss goal.
For weight loss while preserving muscle: Protein 0.8-1g per pound of bodyweight — most important macro. Fat 20-35% of total calories — essential for hormones. Carbs: remaining calories. Example on 1,600 calories for 170 lb person: Protein 170g (680cal), Fat 45g (405cal), Carbs 129g (515cal).
Protein preserves muscle during deficit since muscle burns more calories at rest. Protein is most satiating and keeps you full longest. Protein has highest thermic effect with 20-30% of protein calories burned in digestion versus 5-10% for carbs and 0-3% for fat. High protein dieters lose more fat and less muscle than low protein dieters.
Research supports 0.7-1g of protein per pound of bodyweight for weight loss while preserving muscle. On a 160 lb person: 112-160g protein per day. Higher end 1g per lb if strength training regularly. Lower end 0.7g per lb for sedentary individuals or those above 30% body fat.
Just counting calories works for weight loss. Counting macros additionally helps preserve muscle mass, improve energy levels, and body composition. For beginners: start with calories only. Add protein tracking. Then add all three macros if you want to optimize body composition beyond simple weight loss.
No single ratio works for everyone but common effective ranges: Protein 30-35% of calories, Fat 25-35%, Carbs 30-45%. Lower carb under 100g per day works well for those with insulin resistance. Higher carb works for athletes. Protein target is most important — adjust carbs and fat around it.
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The Macro Calculator for Weight Loss — How Much Protein Carbs and Fat? uses the same formulas, rates, and reference data that financial planners, professionals, and government sources publish. Results are estimates intended for planning and education — for situations involving large sums or legal consequences, confirm with a qualified professional before acting.
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