What is Macro Calculator?
Macro Calculator helps you split a calorie target between protein, carbohydrate and fat.
The main result is carbohydrates, with a breakdown of protein and fat. The formula, example and assumptions below explain how to interpret it.
How to use Macro Calculator
Use the example to get familiar with the form, then enter your own figures. Any rates in the example are illustrative. Check the field labels and units before calculating.
- Gather daily energy target (kcal), protein share (%), carbohydrate share (%) and fat share (%). Use values from the same situation or reporting period.
- Replace the example daily energy target with your own value, then complete the other fields. Check the displayed units.
- Select Calculate and read carbohydrates with its result breakdown. Change one input and calculate again to compare a second scenario. Reset restores the original example.
- Enter daily energy target in kcal, at least 1000 and at most 10000. Decimals are accepted.
- Enter protein share in %, at least 0 and at most 100. Decimals are accepted.
- Enter carbohydrate share in %, at least 0 and at most 100. Decimals are accepted.
- Enter fat share in %, at least 0 and at most 100. Decimals are accepted.
Macro Calculator: a worked example
With the inputs below, the result is 225 g/day (carbohydrates). Follow the example, then replace these illustrative values with your own.
| Input or output | Example value |
|---|---|
| Daily energy target (kcal) | 2,000 kcal |
| Protein share (%) | 25 % |
| Carbohydrate share (%) | 45 % |
| Fat share (%) | 30 % |
| Carbohydrates | 225 g/day |
| Protein | 125 g/day |
| Fat | 66.666667 g/day |
Understanding the Macro result
Read carbohydrates alongside protein and fat. These describe different parts of the same calculation.
Displayed results use a readable number of decimal places. When checking a result by hand, keep extra precision until the last step. To compare scenarios, change one input at a time and keep the others fixed.
- Example Protein: 125 g/day
- Example Fat: 66.666667 g/day
Macro Calculator: assumptions and common mistakes
A useful estimate starts with the right inputs. Check the following assumptions and limits before applying the result to your situation.
- Estimates for general information. They do not diagnose a condition or replace a qualified clinician’s assessment.
- Health estimates are context-dependent. Age, pregnancy, illness, medication and individual measurements can affect interpretation; these tools do not diagnose a condition.
For wider guidance, visit World Health Organization. The formula and scope of this specific tool are stated on this page.
