Label guides
Per 100 g and per 100 mL: useful estimates, with limits
By SteadyScale editorial · Updated October 16, 2026
A common basis answers a specific question
Per-serving figures describe the amount printed on each label. When those amounts differ, an equal-weight or equal-volume estimate can answer a different comparison question. It does not replace the original label or prescribe a portion. Our pages keep the original serving beside the estimate so you can see both.
The arithmetic is straightforward
For an exact value and a supported serving amount, divide the value by that amount and multiply by 100. As an illustrative calculation only, 3 g in a 30 g serving becomes 10 g per 100 g. Those invented example quantities are not a product record or a laboratory result.
A missing measure is not an invitation to guess
The calculation needs a documented mass or volume. Without it, SteadyScale shows no normalized estimate. We do not assume the weight of a cup, infer how many pieces are in a handful, or convert grams to millilitres without evidence. A beverage volume and a solid-food mass are not automatically interchangeable.
Qualified entries retain their qualifier rather than becoming a precise point. Derived values are shown to one decimal place, but calculation does not increase the precision of a rounded source label. A very small apparent difference can therefore deserve more caution than the table’s neat formatting suggests.
Use the result with its context
Read the stated food state, version and source date. Use a common basis for the question it actually answers, then return to the original serving for package context. This is a transparent comparison method, not an overall health ranking or a prediction of your own results.
Sources and checking date
FDA: Serving Size on the Nutrition Facts Label. · Checked 2026-10-16