Meal Macros & Calorie Budget Planner
Calculate personalized calorie and macro targets for protein, fats, and carbs based on goals. Enter values for instant results with step-by-step formulas.
Formula
TDEE = BMR × Activity Factor; Target Calories = TDEE ± Goal Adjustment; Macro g = (Target Calories × Macro %) / Calories per Gram
BMR is calculated using Mifflin-St Jeor equation based on weight, height, age, and gender. TDEE multiplies BMR by activity factor (1.2 for sedentary to 1.9 for very active). Goal adjustments create deficit (fat loss) or surplus (muscle gain). Macro grams are calculated by allocating percentage of target calories to each macro and dividing by calories per gram (4 for protein/carbs, 9 for fat). This framework works because it starts with individual energy needs (BMR/TDEE), adjusts for goals (deficit/surplus), then partitions energy intake across macros based on priorities (high protein for muscle preservation, adequate fat for hormones, carbs for performance). The result is a personalized nutrition plan aligned with body composition objectives.
Worked Examples
Example 1: Fat Loss Macro Plan
Problem:30-year-old male, 80kg, 175cm, moderately active, wants to lose fat. Calculate calorie target and macro split for 0.5kg/week loss.
Solution:BMR Calculation (Mifflin-St Jeor): BMR = (10 × 80) + (6.25 × 175) - (5 × 30) + 5 BMR = 800 + 1,094 - 150 + 5 = 1,749 calories TDEE: 1,749 × 1.55 (moderate activity) = 2,711 calories Fat Loss Target: - 0.5 kg/week requires 3,850 cal deficit/week - 3,850 / 7 = 550 cal deficit/day - Target: 2,711 - 550 = 2,161 calories/day Macro Split (High Protein for Preservation): - Protein: 35% = 756 cal / 4 = 189g (2.4 g/kg) ✓ - Fat: 25% = 540 cal / 9 = 60g (0.75 g/kg) ✓ - Carbs: 40% = 864 cal / 4 = 216g Per-Meal Targets (3 meals): - Calories: 720 per meal - Protein: 63g per meal - Fat: 20g per meal - Carbs: 72g per meal Expected Outcome: - 0.5 kg fat loss per week - High protein preserves muscle - Sustainable deficit (not too aggressive)
Result:2,161 cal/day | 189g protein, 60g fat, 216g carbs | 0.5kg/week loss | Sustainable plan
Example 2: Muscle Gain Macro Plan
Problem:25-year-old female, 60kg, 165cm, very active (lifting 5x/week), wants to gain muscle. Calculate surplus and macros.
Solution:BMR Calculation: BMR = (10 × 60) + (6.25 × 165) - (5 × 25) - 161 BMR = 600 + 1,031 - 125 - 161 = 1,345 calories TDEE: 1,345 × 1.9 (very active) = 2,556 calories Muscle Gain Target: - Moderate surplus: 200-300 cal - Target: 2,556 + 250 = 2,806 calories/day Macro Split (High Protein for Muscle): - Protein: 30% = 842 cal / 4 = 210g (3.5 g/kg—very high) - Adjust: 2.0 g/kg = 120g is sufficient - Revised: 120g × 4 = 480 cal (17%) - Fat: 30% = 842 cal / 9 = 94g (1.6 g/kg) ✓ - Carbs: 53% = 1,487 cal / 4 = 372g (high for training) Per-Meal (4 meals for athletes): - Calories: 700 per meal - Protein: 30g per meal - Fat: 23g per meal - Carbs: 93g per meal Expected Outcome: - 0.25-0.5 kg gain per month - High carbs fuel training - Adequate protein for muscle synthesis - Moderate surplus minimi
Result:2,806 cal/day | 120g protein, 94g fat, 372g carbs | 0.25kg/month gain | Lean bulk
Frequently Asked Questions
What are macros?
Macronutrients (macros) are protein, carbohydrates, and fats—the three nutrients that provide calories. Protein and carbs provide 4 calories per gram; fat provides 9 calories per gram. Balancing macros affects body composition, performance, and satiety beyond just total calories.
How do I calculate calorie deficit for fat loss?
500-calorie daily deficit = ~0.5 kg (1 lb) fat loss per week. 1,000-calorie deficit = ~1 kg/week (aggressive). Don't exceed 1,000 cal deficit—excessive deficits cause muscle loss and metabolic slowdown. Combine moderate deficit (300-500 cal) with strength training to preserve muscle.
What macro ratio is best?
No universal answer—depends on goals and preferences. Balanced: 30% protein, 30% fat, 40% carbs. Low-carb: 35% protein, 40% fat, 25% carbs. High-carb (athletes): 25% protein, 20% fat, 55% carbs. Experiment and track: energy levels, satiety, performance, adherence matter more than perfect ratios.
Should I track macros or just calories?
Beginners: track calories first; easier and covers 80% of results. Intermediate: add protein tracking (most important macro). Advanced: track all three macros for optimization. Tracking macros is more work but enables better body composition—more muscle, less fat at same weight.
How many meals should I eat?
Meal frequency is personal preference. 3 meals, 5 small meals, or intermittent fasting (1-2 meals) all work if total calories and macros match. More frequent meals may help satiety and energy; fewer meals simplify tracking. No metabolic advantage to either approach—choose based on lifestyle and hunger patterns.
What is protein timing and does it matter?
Protein timing is distributing protein across meals. Optimal: 20-40g per meal, 3-5 meals for athletes. But total daily protein matters far more than timing. If you hit daily target, timing is minor optimization. Prioritize: total protein > distribution throughout day > precise timing around workouts.
How do I adjust macros for training days vs rest days?
Option 1: Same macros daily (simpler). Option 2: Carb cycling—higher carbs on training days, lower on rest (fat increases to maintain calories). Athletes may benefit from carb cycling. Casual exercisers: same macros daily is easier and works fine. Test both; adherence matters more than optimization.
How many calories are in each macronutrient?
Protein and carbohydrate each supply about 4 kcal per gram, fat about 9 kcal per gram, and alcohol about 7 kcal per gram. These are Atwater factors — rounded averages, not exact constants — and real absorption varies: fibre yields closer to 2 kcal per gram, sugar alcohols less again, and whole nuts deliver measurably fewer calories than their fat content implies because some remains undigested. Because fat carries more than twice the energy per gram, small measurement errors in fat move your total far more than the same error in protein or carbohydrate, so weigh oils, nut butters, and dressings rather than estimating them by eye.
How many calories should I eat to lose weight safely?
Safe, sustainable weight loss is 0.5-1% of body weight per week — for most people that is 0.5-2 pounds per week. One pound of body fat stores roughly 3,500 calories, so a daily deficit of 500 calories below TDEE produces about one pound of loss per week. Larger deficits accelerate loss but increase muscle loss, hormonal disruption, and metabolic adaptation — the body reduces TDEE by 10-15% in response to sustained large deficits. Minimum intake thresholds exist to preserve muscle and organ function: women generally should not go below 1,200 calories and men below 1,500 without medical supervision. Combining a moderate calorie deficit (300-500 calories) with resistance training best preserves muscle while losing fat, giving better body composition outcomes than diet alone.
How does exercise intensity affect calorie burn?
Exercise intensity and calorie burn have a nuanced relationship. Higher-intensity exercise burns significantly more calories per minute — a 155 lb person burns roughly 400 calories/hour walking at 3.5 mph, 600 calories/hour jogging at 5 mph, and 900 calories/hour running at 8 mph. High-intensity interval training (HIIT) produces a meaningful excess post-exercise oxygen consumption (EPOC) or afterburn effect: metabolism remains elevated 6-15% above baseline for up to 24 hours, burning an extra 50-150 calories. However, HIIT can only be sustained 2-3 times per week before recovery suffers. Moderate-intensity steady-state cardio is sustainable daily and accumulates large total calorie expenditure over a week. The most effective approach pairs regular moderate-intensity sessions with 1-2 HIIT sessions weekly, adapted to your current fitness level.