Macro Calculator

The Macro Calculator computes Protein (g) from 4 inputs: calories, protein %, carb %, fat %. Protein/carb/fat split from total calories.

Health metrics give us objective checkpoints against a body that can feel unreliable. Used alongside professional guidance — not in place of it — these numbers help you track progress and spot trends that matter. The Macro Calculator sits in that toolkit — it protein/carb/fat split from total calories. Enter your numbers above and the result updates instantly; every step of the math is shown in the Derivation panel so you can see exactly how the answer was reached.

Where

cals

Calories

p

Protein %

c

Carb %

f

Fat %

Protein (g)

Output value

Carbs (g)

Output value

Fat (g)

Output value

1. 01Start by noting the input — Calories: 2200.
2. 02Start by noting the input — Protein %: 30.
3. 03Start by noting the input — Carb %: 40.
4. 04Start by noting the input — Fat %: 30.
5. 05Substitute these values into the formula: Protein (g) = e.cals × e.p / 100 / 4 | Carbs (g) = e.cals × e.c / 100 / 4 | Fat (g) = e.cals × e.f / 100 / 9
6. 06Compute Protein (g): the calculator returns 165.
7. 07Compute Carbs (g): the calculator returns 220.
8. 08Compute Fat (g): the calculator returns 73.3333.
9. 09Cross-check the answer by opening the Derivation panel above — every line of math is shown so you can follow the computation end-to-end.

The formula gets rearranged depending on which variable you need. Here are the patterns you’ll run into in the real world — find the one that matches your problem and follow the worked steps.