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  3. How to Calculate Your Macros - Free Calculator & Guide

Learn to calculate protein, carbs, and fat targets for your goals. Use our free macro calculator below.

Quick answer

To calculate your macros, start by determining your Total Daily Energy Expenditure (TDEE) based on your basal metabolic rate and activity level. Then set protein at 1.6-1.8 grams per kilogram of body weight for most active individuals (up to 2.2 g/kg for vegans, concurrent athletes, or aggressive cuts), allocate 20-35% of calories to fat, and fill the remaining calories with carbohydrates. Adjust every 1-2 weeks based on progress.

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Step 1 of 6 — Basics

Health Notice

This calculator provides general estimates for educational purposes. It is not medical advice. Consult a healthcare professional before making significant dietary changes.

The Basics

We need a few details to calculate your energy needs accurately.

Biological Sex

01Step 1: Determine Your TDEE

Your Total Daily Energy Expenditure (TDEE) is the number of calories you burn each day. It combines your Basal Metabolic Rate (BMR) - the energy your body uses at rest - with calories burned through daily activity and exercise. Use a validated equation like Mifflin-St Jeor to estimate BMR, then multiply by an activity factor (1.2 for sedentary up to 1.9 for very active). This gives you your maintenance calories - the starting point for any macro plan.

02Step 2: Set Your Protein Target

Protein is the most important macronutrient for body composition. Research consistently shows that 1.6-2.2 grams per kilogram of body weight optimizes muscle protein synthesis for most people. If you are in a calorie deficit for fat loss, aim for the higher end (2.0-2.2 g/kg) to preserve lean mass. If you are at maintenance or in a surplus, 1.6-1.8 g/kg is typically sufficient. Each gram of protein provides 4 calories, so multiply your target grams by 4 to get your protein calories.

03Step 3: Distribute Carbs and Fat

After setting protein, divide the remaining calories between carbohydrates and fat. A good starting point is allocating at least 20% of total calories to fat for hormonal health (typically 0.7-1.0 g/kg body weight), with the rest going to carbs. Athletes and those who train intensely benefit from higher carbs to fuel performance and recovery. Fat provides 9 calories per gram and carbs provide 4 calories per gram. Personal preference and adherence matter most - some people thrive on higher carbs, others prefer more fat.

04Step 4: Adjust Over Time

Macro calculations are a starting point, not a permanent prescription. Track your intake and body metrics for 1-2 weeks, then evaluate progress. If you are losing weight too fast (more than 1% body weight per week), increase calories by 100-200. If fat loss has stalled, reduce by the same amount. Adjustments should be small and data-driven. This is where AI coaching tools like Calibr8 excel - they automate these adjustments based on your actual data, removing guesswork and ensuring you stay on track.

Frequently Asked Questions

How many calories should I eat to lose weight?

To lose weight, eat 300-500 calories below your TDEE (Total Daily Energy Expenditure). This creates a moderate deficit that promotes fat loss while preserving muscle mass. Avoid extreme deficits below 1,200 calories for women or 1,800 for men, as they can slow metabolism and lead to nutrient deficiencies. Use a macro calculator to find your specific target.

Do I need to hit my macros exactly every day?

No, hitting macros within plus or minus 5-10% is perfectly fine. Weekly averages matter more than daily precision. Focus on hitting your protein target consistently, as it has the biggest impact on body composition. Carbs and fat can fluctuate more day to day without affecting results, as long as total calories stay on target over the week.

How often should I recalculate my macros?

Recalculate every 4-6 weeks, or whenever your weight changes by more than 2-3 kilograms, your activity level changes significantly, or your progress stalls for more than 2 weeks. AI coaching tools like Calibr8 handle this automatically by adjusting your targets weekly based on your tracking data and body composition changes.

What is the best macro ratio for muscle gain?

For muscle gain, aim for a calorie surplus of 200-400 calories above TDEE with protein at 1.6-2.2 g/kg, fat at 20-30% of total calories, and the rest from carbs. This typically works out to roughly 30% protein, 40% carbs, and 30% fat, but individual needs vary based on training volume, body type, and personal response.

On this page
  1. 01Step 1: Determine Your TDEE
  2. 02Step 2: Set Your Protein Target
  3. 03Step 3: Distribute Carbs and Fat
  4. 04Step 4: Adjust Over Time
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Guide + Calculator3 min read

How to Calculate Your Macros - Free Calculator & Guide

Reviewed by Calibr8 TeamUpdated March 17, 2026
On this page
  1. 01Step 1: Determine Your TDEE
  2. 02Step 2: Set Your Protein Target
  3. 03Step 3: Distribute Carbs and Fat
  4. 04Step 4: Adjust Over Time
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