Macronutrient Calculator — Daily Macro Targets & Meal Plan
Calculate your Total Daily Energy Expenditure (TDEE), get a personalized protein, carbs, and fat breakdown with adjustable ratios, and see meal timing suggestions tailored to your goals.
Enter your body stats and goals to get personalized macro targets using the Mifflin-St Jeor equation.
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Lose Fat
500 cal deficit, high protein
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Maintain
Eat at TDEE, balanced macros
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Gain Muscle
300 cal surplus, high protein
Adjust Macro Ratios
Ratios must total 100%. Adjust your sliders.
Your Daily Macro Targets
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TDEE
kcal/day
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Target
kcal/day
0
BMR
kcal/day
Protein: 0g (0 kcal)30%
Carbs: 0g (0 kcal)40%
Fat: 0g (0 kcal)30%
Protein Per Body Weight
Suggested Meal Timing
Split across meals for optimal protein synthesis (20-40g protein per meal).
The Complete Guide to Calculating Your Macronutrients
Understanding macronutrients is one of the most powerful tools for managing body composition, athletic performance, and overall health. Unlike simple calorie counting, tracking macros ensures you are getting the right balance of protein, carbohydrates, and fat to support your specific goals. Whether you want to lose body fat while preserving muscle, maintain a healthy weight, or build lean mass, knowing your optimal macro split makes all the difference.
What Are Macronutrients?
Macronutrients are the three main categories of nutrients that provide energy (calories) to your body. Each macro serves distinct biological functions:
Protein (4 calories per gram) — The building block of muscle tissue, enzymes, hormones, and immune cells. Protein has the highest thermic effect of food, meaning your body burns 20-30% of protein calories during digestion. High protein intake supports muscle protein synthesis, satiety, and metabolic rate during caloric restriction.
Carbohydrates (4 calories per gram) — Your body's preferred fuel source, especially for high-intensity exercise and brain function. Carbs are stored as glycogen in muscles and liver. Complex carbohydrates from whole grains, vegetables, and legumes provide sustained energy, fiber, and micronutrients.
Fat (9 calories per gram) — Essential for hormone production (including testosterone and estrogen), vitamin absorption (A, D, E, K), cell membrane integrity, and brain health. Fat is the most calorie-dense macronutrient, making it important to measure accurately when tracking intake.
How the Mifflin-St Jeor Equation Works
This calculator uses the Mifflin-St Jeor equation, which research published in the Journal of the American Dietetic Association found to be the most accurate predictive equation for estimating resting metabolic rate in both normal-weight and obese individuals. The formula calculates your Basal Metabolic Rate (BMR) — the calories your body burns at complete rest to maintain basic life functions like breathing, circulation, and cell repair.
For men, the equation is: BMR = (10 × weight in kg) + (6.25 × height in cm) - (5 × age in years) + 5. For women: BMR = (10 × weight in kg) + (6.25 × height in cm) - (5 × age in years) - 161. The BMR is then multiplied by your activity factor to determine your Total Daily Energy Expenditure (TDEE), which represents the actual number of calories you burn each day including physical activity.
Choosing Your Goal: Deficit, Maintenance, or Surplus
Your TDEE forms the baseline for setting calorie targets. To lose fat, you need to eat fewer calories than you burn (caloric deficit). To gain muscle, you need a modest surplus. The key variables are:
Fat loss (deficit of 500 calories/day) — A 500-calorie daily deficit creates approximately a 1 pound per week loss, which research shows is optimal for preserving lean mass. Going more aggressive (750-1000 calories) speeds fat loss but increases the risk of muscle loss, metabolic adaptation, and adherence failure.
Maintenance — Eating at your TDEE maintains current body weight. This phase is useful for building healthy habits, recomposition (slowly building muscle while losing fat), or transitioning between cut and bulk phases.
Muscle gain (surplus of 300 calories/day) — A lean bulk of 300 calories minimizes fat gain while providing enough extra energy to support muscle growth. Beginners can gain muscle even at maintenance or slight deficit, but intermediate and advanced lifters benefit from a deliberate surplus.
Optimizing Your Macro Ratios
There is no single perfect macro ratio. The optimal split depends on your goal, training style, food preferences, and metabolic response. However, evidence-based guidelines provide excellent starting points:
Fat loss: 40% protein, 30% carbs, 30% fat. The elevated protein protects muscle during restriction, and moderate fat supports hormonal health.
Maintenance: 30% protein, 40% carbs, 30% fat. A balanced approach that fuels daily activity while meeting protein needs for tissue repair.
Muscle gain: 30% protein, 45% carbs, 25% fat. Higher carbs fuel intense training, replenish glycogen, and support anabolic hormone production. Protein at 1.6-2.2g/kg is sufficient for maximizing muscle protein synthesis.
Meal Timing and Frequency
While total daily macro intake matters most, meal timing can provide a small but meaningful edge. Research on muscle protein synthesis (MPS) shows that consuming 20-40 grams of protein per meal, spread across 3-5 meals daily, maximizes the anabolic response compared to consuming the same total in fewer, larger meals. Post-workout nutrition within 2 hours of training, combining protein and carbohydrates, accelerates glycogen replenishment and muscle recovery.
For fat loss, some individuals benefit from front-loading calories earlier in the day when insulin sensitivity is naturally higher. For muscle gain, distributing carbohydrates around training sessions (pre- and post-workout) can enhance performance and recovery without excessive fat storage.
Common Mistakes When Tracking Macros
Even with accurate calculations, several pitfalls can derail your progress. First, not weighing food with a kitchen scale leads to significant underestimation of portions — studies show people underreport calorie intake by 30-50% when estimating visually. Second, forgetting to count cooking oils, sauces, dressings, and beverages can add 200-500 untracked calories daily. Third, relying solely on scale weight without accounting for water retention, menstrual cycle fluctuations, and glycogen shifts causes unnecessary frustration. Use weekly averages and body measurements alongside the scale for a complete picture.
Finally, remember that all calculator outputs are estimates. Your actual metabolic rate is influenced by genetics, sleep quality, stress, non-exercise activity thermogenesis (NEAT), gut microbiome, and previous dieting history. Treat the numbers as a starting framework, track your results for 2-3 weeks, and adjust by 100-200 calories if progress stalls or exceeds expectations.
⚖ Protein Priority
Set protein first (1.6-2.2g/kg for active individuals), then divide remaining calories between carbs and fat based on your training and food preferences.
⚖ Weigh Your Food
A kitchen scale is the single most impactful tool for accurate tracking. Measuring cups are convenient but can vary 15-30% from actual weight.
⚖ Consistency Over Perfection
Hitting your macros within 5-10g daily is sufficient. Obsessing over exact numbers increases stress without meaningful benefit for most people.
⚖ Reassess Every 4-6 Weeks
As your weight changes, your TDEE changes too. Recalculate your macros periodically, especially after losing or gaining 5+ pounds.