How to measure for a toilet seat

Updated February 21, 2017

The toilet seat has become a wiggly, chipped or torn eyesore. It is definitely time for a new one. You drive for an hour to your local hardware, discount or building supply store and pick up a new one. You get out the tool box and remove the old sit upon which is when you discover you that there is more than one standard size in toilet seats on the market. You bought the wrong size seat replacement. Measure the toilet seat before you go shopping for a new one.

Measure from post hole to post hole at the back of the seat area. The standard measurement is 5 and 1/2 inches between the holes.

Hold the measuring tape at the centre front of the toilet bowl and stretch it to the centre of the hinges between the post holes. Record the measurement.

Write down that a round seat is needed for approximately a 16 and 1/2 inch measurement.

Write down that an elongated toilet seat is needed to cover the area of approximately an 18-inch measurement.

Place the note pad with your measurements into your pocket or purse to have it ready for your trip to the store.


Be sure to read the measurements on the box for a new toilet seat at the store.

Things You'll Need

  • Measuring tape
  • Pad and pen
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About the Author

Suzie Faloon is a freelance writer who has written online content for various websites. As a professional crafter and floral designer, Faloon owned a florist business for nearly 25 years. She completed the Institute of Children's Literature course in 1988.