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Health Calculators/Macro Calculator

Macro Calculator

Split your daily calories into protein, carbs and fat for your goal.

Macro Calculator

Understanding macros

What each macro does

  • Protein: builds and repairs muscle and keeps you full for longer
  • Carbs: your body’s main fuel, especially for the brain and hard training
  • Fat: supports hormones and helps you absorb vitamins A, D, E and K

Energy per gram

  • Protein: 4 kcal
  • Carbs: 4 kcal
  • Fat: 9 kcal

From percentages to grams

The calculator first estimates your daily calories from your body, activity and goal, then splits them 30% protein, 40% carbs and 30% fat. On 2,000 kcal that is 600 kcal of protein (÷ 4 = 150 g), 800 kcal of carbs (÷ 4 = 200 g) and 600 kcal of fat (÷ 9 ≈ 67 g).

Official reference ranges

The European Food Safety Authority suggests 45–60% of calories from carbs, 20–35% from fat and about 0.83 g of protein per kg of body weight. Our default gives protein a bigger share and carbs a slightly smaller one, which helps you stay full and keep muscle when you eat less. Both approaches are reasonable for healthy adults.

Common splits (protein / carbs / fat)

  • Balanced: 30 / 40 / 30
  • Higher protein: 35 / 35 / 30
  • Mediterranean: 20 / 45 / 35, with most fat from olive oil, nuts and fish
  • Lower carb: 40 / 20 / 40
  • Keto: 25 / 5 / 70
  • Keto and very low-carb diets are not for everyone: check with a professional first if you have kidney disease, take diabetes medication, or are pregnant or breastfeeding

Why track macros, not just calories

Calories decide whether your weight goes up or down, but the split decides what that weight is made of. Enough protein keeps you full and protects muscle while you lose fat, and knowing where your carbs and fat come from makes it easier to build meals you actually enjoy.

Hitting your macros

  • Build each meal around a protein source
  • Weigh foods at first to learn portion sizes
  • Check labels for carbs and fat per portion
  • Aim for a consistent week rather than a perfect day

Good to know

Treat the split as a starting point and adjust it to how you feel, train and recover. A registered dietitian can tailor it to medical needs.

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