Portion Size Estimator

First, the tool uses your raw weight and cooked/final weight to estimate a yield/shrink (or gain) factor. Then it divides the cooked batch into either (a) a target grams-per-portion amount or (b) a chosen number of servings. Calories and macros are allocated to each portion proportionally based on that portion’s share of the cooked weight.

This calculator assumes calories and macros distribute evenly across the batch and that cooking mainly changes weight through water loss/gain. If you drain fat, remove bones/trim, or toss in extra ingredients after weighing, the per-portion estimate can skew. For best accuracy, weigh the batch as close as possible to how you will portion it (including sauces you’ll eat).

Don’t enter a cooked weight of zero, negative values, or negative macros/calories—these are flagged by the tool. If cooked weight is far lower than raw weight, it flags “high shrinkage,” which usually means portions will be smaller than expected; if cooked weight is higher, it flags “weight gain after cooking,” often from added liquid or sauce. Also watch for very small (<75 g) or very large (>400 g) portions, since those ranges may be unrealistic for typical serving sizes.

If your chosen number of servings doesn’t evenly split the cooked weight, the calculator shows the exact fractional servings and suggests rounding. The nutrition remains proportional to the precise fraction, so rounding only affects how you physically portion, not the underlying math.