To determine how many grams of each macro you should eat, you first need to calculate your daily calorie needs. Here’s how:
Step 1: Calculate Your Total Daily Energy Expenditure (TDEE)
Your TDEE is the number of calories your body needs to maintain its current weight. It’s based on your Basal Metabolic Rate (BMR), which is the number of calories your body burns at rest, and your activity level.
You can calculate your TDEE using an online calculator or the following formula:
- Men: BMR = 10 x weight (kg) + 6.25 x height (cm) - 5 x age (years) + 5
- Women: BMR = 10 x weight (kg) + 6.25 x height (cm) - 5 x age (years) - 161
Once you have your BMR, multiply it by an activity factor:
- Sedentary (little or no exercise): BMR x 1.2
- Lightly active (light exercise/sports 1-3 days/week): BMR x 1.375
- Moderately active (moderate exercise/sports 3-5 days/week): BMR x 1.55
- Very active (hard exercise/sports 6-7 days a week): BMR x 1.725
This will give you your TDEE, the number of calories you should aim for each day.
Here’s a handy calculator to take all the effort away:
TDEE Calculator
Step 2: Set Your Macro Ratios
Once you know your TDEE, you can use the macro ratio you’ve chosen to determine how many grams of each macro you should consume daily.
- Protein and carbs both contain 4 calories per gram.
- Fat contains 9 calories per gram.
For example, if your TDEE is 2,000 calories and you’re following a 40% protein, 30% fat, and 30% carb ratio for weight loss:
- Protein: 40% of 2,000 = 800 calories / 4 = 200 grams of protein.
- Fat: 30% of 2,000 = 600 calories / 9 = 67 grams of fat.
- Carbs: 30% of 2,000 = 600 calories / 4 = 150 grams of carbs.