Combine two batches without averaging the wrong servings

By GetMacros · Published October 4, 2026

When two batches have different serving counts, average serving values only after accounting for their sizes. A simple average of the two printed per-serving numbers can give the wrong result for the combined food.

A worked batch example

Suppose batch A totals 1,200 kcal across four equal servings, while batch B totals 900 kcal across three. Together they provide 2,100 kcal in seven servings at 300 kcal each. Here both original portions happen to be 300 kcal, so their average looks harmless.

Now suppose B has only two equal servings instead. Its portions are 450 kcal; the combined six portions still sum to 2,100 kcal, averaging 350. The simple average of 300 and 450 is 375, which is wrong because the batches contribute different numbers of portions.

Use the whole quantities

Add whole-batch protein, carbs and fat separately, then divide by the number of equal portions actually made. If you mix by weight and serve unequal amounts, weigh the finished combined batch and calculate each portion’s fraction instead of assuming the old serving counts survive.

Keep the input basis compatible

These are invented figures, not a tested recipe. Actual batches need the amounts used, correct raw or prepared label basis and a clear final yield. Do not combine a per-serving entry with a whole-batch entry without converting it first. The useful rule is to add compatible totals before calculating a new portion, rather than averaging attractive-looking labels.