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How to Measure Toilet Seat

Lowe's Editorial Team

By Lowe's Editorial Team
Published February 10, 2025

You may need to replace your toilet seat if it has visible cracks, chips or discoloration. But choosing one without measuring can lead to a poor fit. This article explains how to measure toilet seats to ensure a seamless upgrade to your bathroom.

Tools and Materials

Step-by-step Guide on How to Measure Toilet Seat

Toilet seats are generally available in two standard shapes- round and elongated. These terms refer to the shape of the toilet bowl. You will need a toilet seat of the same shape as the toilet bowl to ensure even coverage. Here are the steps through which you can measure the toilet seat yourself:

Common Mistakes to Avoid

Most toilet seats are either round or elongated-shaped. However, it is best to measure the toilet seat to make sure you have a standard-sized toilet seat. You must always double-check the measurements to avoid any hassle. This will also prove to be helpful if you are looking to add a toilet seat with extra features like a slow-close lid, heated, night light or padded seat.

Frequently Asked Questions

1. How to tell if my toilet seat is round or elongated?

To find out if your toilet seat is round or elongated, measure from the seat hinges to the front lip of the toilet bowl. Round seats usually measure about 16 to 17- inches, while elongated seats are about 18 to 19- inches.

2. Is the size of toilet seats the same everywhere?

Though many toilet seats have standard dimensions, you might have a specialty toilet seat that is not commonly available. Always measure your toilet seat size to ensure it fits well.

3. Can I use an extended toilet bowl with a circular seat?

It is not recommended to use a toilet seat of a different shape than your toilet bowl. It may be uncomfortable and not fit properly. With time, it may even shift, cause discomfort or even get damaged.

4. What to do if the new seat doesn't fit the regular sizes?

If the new seat doesn't fit regular sizes, contact the manufacturer to get information on specific size requirements or customized options.

5. What are the early signs of replacing the toilet seat?

Look for early signs like cracks, stains, wobbling or discomfort when using the toilet seat. These signs mean it's time to replace it.

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