Macro Calculator
Calculate your optimal protein, carbohydrate, and fat intake for your goals
How to Use This Macro Calculator
- Enter your age, gender, height, and weight
- Select your activity level (be honest - most people overestimate)
- Choose your weight goal: lose, maintain, or gain
- Pick a macro ratio: Balanced, Low Fat, Low Carb, or High Protein
- Click 'Calculate Macros' to see your personalized daily targets
Example: A 170 lb moderately active male maintaining weight needs about 2,500 calories. With a Balanced ratio (30/40/30): 188g protein, 250g carbs, 83g fat. Split across 3 meals: 63g protein, 83g carbs, 28g fat per meal.
Tip: Start with the Balanced ratio and adjust after 2-3 weeks based on how you feel, your hunger levels, and your progress.
Why Use a Macro Calculator?
Knowing your macro targets transforms random eating into strategic nutrition. While calories determine weight change, macros determine body composition and how you feel.
- Lose fat while preserving muscle (high protein prevents muscle loss)
- Build muscle efficiently by hitting protein thresholds for growth
- Fuel endurance training with adequate carbohydrates
- Manage energy levels throughout the day
- Track nutrition in apps like MyFitnessPal with specific targets
- Break through plateaus by adjusting macro distribution
Understanding Your Results
Your results include daily calorie target, grams for each macronutrient, and per-meal breakdowns.
| Result | Meaning | Action |
|---|---|---|
| Protein 0.7-1g per lb body weight | Adequate protein for muscle maintenance | Distribute across 3-4 meals with 25-40g per sitting |
| Carbs 40-60% of calories | High carb approach - good for active individuals | Time more carbs around workouts for energy and recovery |
| Fat 20-35% of calories | Supports hormone production and satiety | Don't go below 20% fat long-term; hormones need dietary fat |
Meaning: Adequate protein for muscle maintenance
Action: Distribute across 3-4 meals with 25-40g per sitting
Meaning: High carb approach - good for active individuals
Action: Time more carbs around workouts for energy and recovery
Meaning: Supports hormone production and satiety
Action: Don't go below 20% fat long-term; hormones need dietary fat
Note: These are starting points. Your actual needs vary based on genetics, training intensity, sleep, stress, and metabolic adaptation. Adjust based on real-world results.
About Macro Calculator
Formula
TDEE × Activity Multiplier ± Goal Adjustment = Daily Calories; then distributed by macro percentages The Mifflin-St Jeor equation calculates your basal metabolic rate, multiplied by activity level for TDEE. Macros are then calculated by multiplying calories by each percentage and dividing by calories per gram.
Current Standards: Research supports 1.6-2.2g protein per kg for muscle building, 3-5g carbs per kg for moderate activity, and 0.5-1.5g fat per kg for hormone health. These translate to roughly 30-35% protein, 40-50% carbs, 20-30% fat for most fitness goals.
Frequently Asked Questions
Which macro ratio should I choose?
Balanced (30/40/30) works for most people starting out. Choose High Protein (40/35/25) if you're weight training seriously or dieting - the extra protein preserves muscle. Low Carb (40/20/40) suits those who prefer fat for satiety or have blood sugar concerns. Low Fat (30/50/20) helps endurance athletes or those who feel better on higher carbs. Experiment to find what works for your body.
How important is hitting my macros exactly?
Aim for within 5-10g of each target. Protein is most important to hit consistently - falling short limits muscle retention and recovery. Carbs and fat can trade off somewhat as long as calories are correct. Don't stress over being 3g off; consistency over weeks matters more than daily perfection.
Should I eat the same macros on rest days?
Most people can keep macros consistent daily. If you want to optimize further, you can reduce carbs by 25-50g on rest days and add them back on training days - this is called carb cycling. Protein should stay high every day. The difference is marginal for most people; simplicity often leads to better adherence.
How do I track macros without losing my mind?
Start by tracking just protein for a week - it's the most important macro. Then add the others. Use an app like MyFitnessPal and weigh food initially to calibrate your portions. After a few weeks, you'll eyeball accurately. Meal prepping similar meals makes tracking easier. You don't need to track forever - just until you develop intuition.
Why am I not losing weight even hitting my macros?
Common culprits: underestimating portions (weigh food, don't eyeball), forgetting to track oils/sauces (100+ calories per tablespoon), weekends 'off' erasing the deficit, or activity level overestimated. Also, weight fluctuates - track weekly averages. If no change in 3 weeks at accurate tracking, reduce calories by 200 (usually from carbs or fat, keep protein high).