Meal Portion Macro Targeting Tool

First, it totals the recipe’s calories and macros by summing across all ingredients (using the macro values you enter for each ingredient amount). Then it treats your recipe as a macro “density” per gram and estimates what fraction of the total recipe would meet your targets. Finally, it chooses the portion size that minimizes overall mismatch—typically closest to your calorie target while keeping protein/carbs/fat as near as possible.

Accuracy depends on whether your ingredient macro data matches the actual cooked state and whether recipe yield changes after cooking. If you portion by weight but your recipe yield is entered loosely (or missing total cooked weight), the recommended grams can drift. Also note that fiber, sodium, and micronutrients aren’t modeled—only calories and the macros you target.

Avoid zero totals: if the recipe calories or the total weight used for scaling is 0, the portion calculation can’t be computed. Make sure all ingredient quantities are positive and macros are non-negative. If your macros imply very different calories than you expect from the ingredient labels, double-check the calories field you entered for each ingredient before trusting the final portion.

If your recipe is extremely protein-heavy or fat-heavy relative to your target, no portion size can satisfy all macros at once—so the tool will flag a “Poor match.” If only one target is provided (e.g., calories with protein/carbs/fat set to 0), the recommendation will effectively follow calories more strongly. Use the match status thresholds as a quick sanity check rather than a guarantee.