Macros for athletes: understand a target and check your meals
Topics: macros for athletes · macro targets · grams and calories · portion conversion
A macro target is easier to understand when its units and what it covers are clear. Here is how to distinguish grams of nutrients, calories, portions and daily totals, then check a food entry. The formulas help with the arithmetic; Sthenia’s suggested targets remain estimates based on your profile.
Identify the units and what the figures cover
| Information | What to check |
|---|---|
| Calories in kcal | Does the figure refer to a food, a meal or the whole day? |
| Macronutrients in grams | Is this the weight of protein, carbohydrate or fat, rather than the weight of the food? |
| Values on a label | Are they given per 100 g, per 100 ml or per stated portion? |
Connect grams to calories
The general Atwater factors presented by FAO use approximately 4 kcal per gram of protein, 4 for carbohydrate and 9 for fat. They allow a simple arithmetic check. Other components and certain specific conversion factors may contribute to a food’s total energy value; this check does not replace the nutritional reference you are using.
Apply the general factors to the available data
| Recorded value | Calculation | Energy contribution |
|---|---|---|
| Protein in grams | grams × 4 | kcal from protein |
| Carbohydrate in grams | grams × 4 | kcal from carbohydrate |
| Fat in grams | grams × 9 | kcal from fat |
| Simplified total | Add these contributions together | Compare with the reference you are using |
Use the quantities from your food reference. This formula does not set a daily target.
References: [1]
Convert values to the portion you used
On an EU food label, values are expressed per 100 g or per 100 ml and may also be shown per portion. Always compare values on the same basis.
To convert a value given per 100 g: amount of nutrient in the portion = value per 100 g × portion weight in grams ÷ 100. Use the data from the food record and the quantity you actually used; the formula does not choose a portion for you.
References: [3]
Review your day before interpreting a difference
Check the food selected and the quantity you actually entered.
Review the nutritional reference used for each entry.
Keep what was planned separate from what you actually ate.
When a photo is the starting point, check the estimated foods and quantities.
References: [4]
Use a target with Sthenia
Sthenia estimates targets based on your profile, sport and goal. A displayed value remains an estimate. To understand how the engine works and the limitations of food matching, read Sthenia’s nutrition method.
Manual calorie and macro tracking is free and unlimited. If you then want to plan upcoming meals, the personalised seven-day plan is part of the paid Pro offer. The checks above do not determine your individual needs.
References: [4]
Frequently asked
- Does this guide calculate my individual needs?
It helps you understand a target and check units. The formulas use the data you record. Sthenia estimates its targets from the profile you enter; the product’s method and limitations are explained in the guide linked above.
- Why does my total not match 4/4/9 exactly?
The general factors provide a simplified check. Other energy-yielding components and specific factors may be included in a food’s reference values. Also check that the values you are comparing refer to the same portion.
- Are grams of food the same as grams of protein?
The weight of a food and the weight of a nutrient are different pieces of information. Read the amount of nutrient stated per 100 g or per portion before converting it.
References: [3]
Sources
Also worth reading
- From macros to meals: build your 7-day meal planTurn your calorie and macro targets into a week of meals: menu ideas, portion adjustments and a method for putting together your grocery list.
- Calories and macros for a cut: calculate a realistic targetEstimate your maintenance calories, set a deficit and work out your macros, then check whether your targets fit the meals you actually eat.
- Cutting meal plan for strength training: review your week before changing your intakeSeparate planned meals, actual intake and uncertainties to review your cutting meal plan, without automatic rules for changing calories.