Macro Calculator
Calculate protein, carbs, and fats
The Macro Calculator breaks down your daily calories into optimal amounts of Protein, Carbohydrates, and Fats. This approach helps you fine-tune your diet for body composition, not just weight loss.
Inputs Explained
- Calories: Your TDEE (Total Daily Energy Expenditure) + or - your surplus/deficit.
- Percentages: The ratio of P/C/F you want to follow (e.g., 30/40/30).
Method
We use standard nutritional values: Protein (4 cal/g), Carbs (4 cal/g), and Fats (9 cal/g) to convert your percentage goals into precise gram targets.
Formula
Protein & Carbs: 4 cal/gram
Fat: 9
cal/gram
Common splits: 30/40/30 or 40/40/20 (P/C/F)
Macro Splits by Goal
| Goal | P/C/F |
|---|---|
| Weight Loss | 40/30/30 |
| Muscle Gain | 30/45/25 |
| Maintenance | 30/40/30 |
| Keto | 20/5/75 |
Related Calculators
Complete Guide to Macronutrients
Macronutrients ("macros") are the nutrients your body needs in large amounts to function. While calories determine how much you weigh, macros determine what that weight looks like (muscle vs. fat).
Step-by-Step Example Calculation
Let's calculate the macros for someone aiming for a "Balanced" diet:
- Daily Calories: 2,000 kcal.
- Goal: 30% Protein / 40% Carbs / 30% Fat.
The Math:
- Protein (4 cal/g): 2000 × 0.30 = 600 cal. Divide by 4 = 150g.
- Carbs (4 cal/g): 2000 × 0.40 = 800 cal. Divide by 4 = 200g.
- Fat (9 cal/g): 2000 × 0.30 = 600 cal. Divide by 9 = 67g.
The Big 3: P / C / F
1. Protein (4 calories per gram)
The building block of muscle. Essential for repair, recovery, and satiety.
Sources: Meat, fish, eggs, dairy, beans, tofu.
2. Carbohydrates (4 calories per gram)
The body's primary fuel source, especially for high-intensity exercise.
Sources: Rice, oats, potatoes, fruits, vegetables.
3. Fats (9 calories per gram)
Vital for hormonal health (testosterone/estrogen) and vitamin absorption.
Sources: Nuts, oils, avocado, fatty fish, egg yolks.
Choosing Your Split
| Goal | Protein | Carbs | Fats | Notes |
|---|---|---|---|---|
| Balanced | 30% | 40% | 30% | Great starting point for maintenance. |
| Fat Loss | 35-40% | 30-35% | 25-30% | Higher protein keeps you full. |
| Muscle Gain | 25-30% | 45-55% | 20-25% | High carbs fuel hard training. |
| Keto/Low Carb | 30% | 5-10% | 60-65% | For specific metabolic goals. |
Sources & references
- International Society of Sports Nutrition (ISSN): Position Stand on nutrient timing and macronutrients.
- Helms, E. R., et al. (2014): Evidence-based recommendations for natural bodybuilding contest preparation: nutrition and supplementation.
Frequently Asked Questions
Macros (macronutrients) are the three main nutrients that provide energy: Protein (repair), Carbohydrates (energy), and Fat (hormones). specific ratios can optimize your body composition better than calorie counting alone.
A 'High Protein, Moderate Carb' split is generally best for fat loss. A common starting point is 40% Protein, 35% Fat, and 25% Carbs. This maximizes satiety and muscle preservation while reducing insulin spikes.
No, exact precision isn't necessary. Aim to be within +/- 5-10 grams of your targets. Consistent calorie adherence is the most important factor, followed by hitting your minimum protein target.
IIFYM is a flexible dieting strategy that allows you to eat any foods as long as they fit your daily macro targets. While effective for weight change, we recommend getting 80% of your calories from nutrient-dense whole foods.
For active individuals and those in a calorie deficit, science recommends 1.6g to 2.2g of protein per kg of bodyweight. This ensures you maintain lean muscle mass while losing fat.
No. Carbohydrates do not make you fat; excess calories do. However, reducing carbs can help reduce water weight and manage appetite for some people. Active individuals need carbs to fuel intense workouts.
You should rarely drop below 0.3g of fat per lb of bodyweight (or about 15-20% of total calories). Dietary fat is essential for hormone production (testosterone/estrogen) and absorbing vitamins A, D, E, and K.
The most accurate way is using a digital food scale to weigh food raw/uncooked. Use an app like MyFitnessPal or Cronometer to log the weights. Cups and spoons are often inaccurate for solid foods.