What is the best macro ratio for weight loss?

There's no single universal ratio, but high-protein approaches consistently outperform in research. A starting point for fat loss: protein 30–35% of calories, fat 25–30%, carbs 35–45%. Higher protein preserves muscle during a deficit and increases satiety. Total calorie deficit matters most; macro ratios determine how much muscle you retain and how full you feel.

How much protein do I really need?

The RDA of 0.36g per pound is the minimum to prevent deficiency in sedentary adults — not the optimal amount for body composition. For active adults trying to lose fat or build muscle, the evidence supports 0.7–1.0g per pound of bodyweight, or 0.8–1.2g per pound of lean body mass. More protein is rarely harmful and provides satiety and muscle-preservation benefits.

Should I eat fewer carbs to lose weight?

Low-carb diets work for many people, primarily because they naturally reduce calorie intake and water retention. However, research shows that calorie-controlled diets with moderate carbs produce similar long-term fat loss. Carbs fuel high-intensity exercise — cutting them too aggressively impairs performance and recovery. The best diet is the one you can sustain.

What calorie surplus do I need to build muscle?

The body can only synthesize roughly 0.25–0.5 lbs of muscle per week under ideal conditions. Eating more than ~250–500 calories above maintenance ('lean bulk') primarily adds fat, not extra muscle. A conservative surplus of 200–300 calories with high protein is more effective than aggressive bulking for most natural lifters.

❤️Health

How Much Protein, Carbs, and Fat Should You Eat Each Day?

How much protein, carbs, and fat should you eat?

What This Does

Counting calories gets you halfway there. Counting macros — the three macronutrients (protein, carbohydrates, and fat) that make up your calorie intake — is what separates generic dieting from targeted body composition change. Whether your goal is losing fat while preserving muscle, building muscle efficiently, or maintaining your current weight, the ratio of macros matters as much as total calories. The foundation is your Total Daily Energy Expenditure (TDEE) — the number of calories your body burns daily based on your basal metabolic rate and activity level. From there, a calorie target is set based on your goal (deficit for fat loss, surplus for muscle gain, maintenance for recomposition). The macros are then split from that calorie total using research-backed ratios: protein requirements are set in grams per pound of bodyweight, fat provides essential hormonal and cellular functions, and carbohydrates fill the remaining calories to fuel training and daily activity. Protein is the non-negotiable macro. For most active adults aiming to change body composition, 0.8–1.2g per pound of lean body mass or bodyweight is the evidence-based target. Fat carries 9 calories per gram (versus 4 for protein and carbs), so even modest fat intake consumes a substantial calorie budget. This calculator gives you personalized daily gram targets for all three macros across multiple goal scenarios.

When Should You Use This?

→Starting a diet and needing to know how many grams of protein, carbs, and fat to eat daily
→Transitioning from calorie counting to macro tracking for better body composition results
→Adjusting macros after hitting a weight loss plateau
→Planning nutrition for muscle building with minimal fat gain
→Comparing macros across different dietary approaches (high protein, keto, moderate carb)

Example Scenario

Marcus, 28, male, 185 lbs, 5'11", moderately active with 4 workouts per week. Goal: fat loss. Estimated TDEE: approximately 2,850 calories. With a 20% deficit: 2,280 calorie target. Macros: Protein at 1g/lb = 185g (740 calories), Fat at 25% of calories = 63g (570 calories), Carbs fill the remainder: (2,280 − 740 − 570) ÷ 4 = 243g. Marcus now has concrete daily targets: 185g protein, 243g carbs, and 63g fat — specific enough to track and adjust.

Macro Calculator

Calories · Protein · Carbs · Fat · Meal Breakdown · Timeline

Results update in real time as you adjust any input.

Weight (lbs)

Height

ftin

Age

Sex

Activity Level

Meals / Day

Goal

-500 kcal deficit below TDEE

About This Calculator

This macro calculator uses the Mifflin-St Jeor BMR formula, multiplied by an activity factor to calculate TDEE, then applies a calorie deficit or surplus based on your selected goal. Five goals are supported: Aggressive Fat Loss (−750 kcal), Fat Loss (−500 kcal), Maintenance (0), Lean Gain (+250 kcal), and Bulk (+500 kcal). Protein is calculated as a percentage of bodyweight (0.75–1.0g/lb depending on goal), fat as a percentage of total calories, and carbohydrates fill the remaining calorie budget. All results update in real time across all inputs and goal buttons.

The Macros tab renders a donut PieChart of calorie distribution (protein, carbs, fat) with percentage labels, alongside proportion bars and a grouped bar chart comparing per-meal vs daily totals for each macro. The Goals tab shows a bar chart of daily calorie targets at all five goal levels, with your selected goal highlighted and a TDEE reference line. The Timeline tab shows a line chart of projected weight over 12 weeks at your current calorie target, with a reference line at starting weight and an endpoint marker.

Goal accent colours: red (Aggressive Fat Loss), orange (Fat Loss), indigo (Maintenance), emerald (Lean Gain), violet (Bulk). A macro plan score (0–100) rewards adequate protein, safe calorie level, and a rate of change within healthy limits. Health flags automatically appear when calories fall below 1,200, protein falls below 0.7g/lb, rate of change exceeds 1.5 lbs/week, or calories fall below 1,400 on an aggressive protocol. Disclaimer: these are estimates based on population-average formulas; individual variation, tracking accuracy, and metabolic adaptation all affect real-world outcomes. Consult a registered dietitian for clinical nutrition planning.

Results are estimates only and do not constitute medical advice. Consult a qualified healthcare professional before making health decisions.