How toy brands measure differently

Two size charts can describe the same toy with different numbers. Here is what each term means and how to compare them fairly.

Around or across

Some makers give circumference, the distance around. Others give diameter, the distance across. Mixing them up is the most common sizing mistake, because the numbers are so different.

To convert, divide the distance around by 3.14 to get the distance across. On GirthGuide, the Units button at the top switches every number on the site between the two, and between inches and centimeters.

Usable length or overall length

Overall length is the whole object, base included. Usable length (often called insertable length) stops where the base or flare begins. The difference is commonly one to three inches. When comparing, always use usable length. Where a maker gives only overall length, we estimate the usable part and mark it as an estimate.

Which girth

Charts may list girth at the head, the middle, the base, a knot, or just a single "widest" figure. A toy listed as 7 inches at the head may be 8.5 at the base. We record every point a maker publishes and show the widest one that you would actually take, leaving out flared bases and stands.

Size names mean nothing across brands

A "medium" from one maker can be larger than a "large" from another. Size names only order the sizes within one toy line. Compare measurements, never names.

Handmade variation

Most of these toys are poured by hand. Makers commonly note that real toys can differ slightly from the chart, and softer silicone also compresses more, so a soft toy feels a little smaller than a firm one with the same measurements.

The short version

Convert everything to the same units, compare usable length, and look at where the girth sits, not only the biggest number. Or let the Compare tool put any toys on one scale for you.