Read the heading above the nutrition numbers first. Per serving and per one hundred grams answer different questions, so compare products on the same basis before deciding which number is larger.

A printed serving is not automatically your personal recommended portion. On US labels it reflects typical consumption, and the package may contain several servings even when it looks easy to finish.

Imagine one product has eight grams of protein per hundred grams. Another has twelve grams in a two-hundred-gram serving. The second serving is larger, but its protein concentration is lower.

To estimate your portion, multiply the per-hundred-gram value by the weight you eat, then divide by one hundred. Keep units consistent and include added ingredients only when calculating the complete meal.

Check whether the label describes dry, drained or prepared food. A preparation example may include ingredients you did not use, so copying that total can produce a comparison that looks precise but mismatches.

Use the calculation for a clear purpose, such as comparing breakfast ingredients. Then check allergens and storage separately. A favourable number does not establish that a food is safe or suitable for you.