Nutrition per 100 g vs per serving

What does per 100 g mean?

A per-100 g value expresses the amount of a nutrient in 100 grams of the finished food. It creates a common weight basis that can be useful for comparison, calculation and data interchange.

For a recipe, the calculation should use the final usable recipe weight when the result is intended to describe the finished food.

What does per serving mean?

Per serving describes the nutrients in the portion actually defined for service. A serving can be one bowl, one plated portion, one slice or a specified gram weight.

The calculation is straightforward when the finished batch is divided into a known number of equal portions.

Converting from per 100 g to a serving

If a reliable per-100 g result and a reliable serving weight are already known, per-serving nutrition can be calculated directly.

How yield affects the two bases

Yield has a direct effect on per-100 g nutrition because it changes the weight across which the recipe nutrients are distributed. Water loss can make the finished food more nutrient-dense by weight; water absorption can do the opposite.

Per-serving nutrition can remain stable if the batch nutrients and number of portions remain unchanged, but it will change if the kitchen changes portion count or serving weight.

Which basis should a professional kitchen keep?

For recipe management, it is useful to retain the total recipe nutrition, final yield, per-100 g result and per-serving result together. That makes it easier to audit a value, resize a portion or update a menu without repeating the entire calculation manually.

The basis used for public display or regulatory documentation should follow the requirement that applies to the business and jurisdiction.