How to Measure a Toilet Seat

Round or Elongated?

Every year our Customer Service team takes calls from people who need to know what size toilet seat they should buy. It’s a good thing they ask, because toilet seats are designed to fit one of two bowls: round or elongated. A round toilet seat absolutely won’t fit an elongated bowl, and, as you may have guessed, the opposite is also true.

What to do about this? Grab a tape measure and a way to record what you find and let’s get started.

As we said, toilet seats come in two sizes: round and elongated. Every toilet seat is one of these two, indicated on its packaging.

Using a tape measure, determine the distance between the center of the mounting holes in the back of the toilet. The standard measurement for this distance is 5 ½”, with a midpoint of approximately 2 ¾”. Place the hook of your tape measure at the midpoint and measure to the outside edge of the toilet bowl rim in front.

A round toilet bowl will measure approximately 16 ½” in length. An elongated bowl is approximately 18 ½” in length. Based on your measurement, order the appropriate seat – round or elongated – for your bowl. Our seats are designed to fit most manufacturers’ round or elongated bowls.

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