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Surface area

A lower bound, stated as one

By Dwight Davis, Founder

On this page11
12.06 square inches is the side wall. The regulation's number is larger.

What we publish

Height and diameter, on 147 of the 163 containers in this group. Both fields together give the cylindrical side wall.

The computation

Pi times diameter times height. For an 88.7 mL jar 2.875 inches across and 1.335 tall, that is 12.06 square inches.

What the regulation measures

Total surface area available to bear labeling, which is a broader measure. A lid face, a shoulder and a base can all carry labeling.

So our figure is always smaller

Which makes it a lower bound rather than an estimate, and a lower bound is a usable thing as long as it is called one.

It answers one direction cleanly

If the side wall alone is over 40 square inches, the container is over 40. 56 of our 147 are in that position and the answer is settled.

And it leaves the other direction open

A container at 35 square inches on the side wall may be over 40 once the rest is counted. 91 of 147 sit in that uncertain position.

Which is why the figure is published as a bound

An estimate of the regulation's own measure would need assumptions about which surfaces are available, and those are properties of your label and not of our container.

The same discipline as the topicals property

There we publish the character count and the panel dimensions and refuse to compute a fit, because character width is a typeface property. Here we publish a bound and say it is one.

And 16 containers cannot be computed at all

Height is recorded on 152 and diameter on 147, so 16 of the 163 lack one or both. For those the question cannot be answered from our data.

A blank field is a reason to ask

Not a reason to assume. We do not fill dimensions in with a guess.

References

The Davis Pack Supply catalog, measured 19 October 2026. Height and diameter are both published on 147 of the 163 containers in this group, which allows the cylindrical side-wall area to be computed. It runs 12.06 to 84.25 square inches with a median of 33.4: none under 12 square inches, 91 in the 12 to 40 band and 56 over 40. The smallest is an 88.7 mL PET single wall jar, 2.875 inches across and 1.335 inches tall, at 12.06 square inches. These figures are the side wall only and are therefore a lower bound on the regulation's measure, which is the total surface area available to bear labeling.
21 CFR 101.36(i), on the Supplement Facts label: "All information within the nutrition label on small-sized packages, which have a total surface area available to labeling of less than 12 square inches, shall be in type size no smaller than 4.5 point", and "packages, which have from 12 to 40 square inches of surface area available to bear labeling, shall be in type size no smaller than 6 point". The same paragraph provides that where space is constrained "the hairlines may be omitted and replaced by a row of dots connecting the columns". law.cornell.edu
Written from 21 CFR 101.36 and from the catalog as it stood on 19 October 2026. The surface area figures here are computed from published height and diameter and are the cylindrical side wall only, which is a lower bound: the regulation measures the total surface area available to bear labeling, and that is more. Nothing on these pages sets out what a Supplement Facts panel must contain, which ingredients may be used, or what claims are permitted. A dietary supplement's serving size is determined by reference to the amounts in 21 CFR 101.12(b) rather than by the maker.