How to Measure for a Toilet Seat

When a toilet seat becomes a wiggly or chipped eyesore, you need a sturdy replacement. Whether you want a wooden, padded or a plastic seat, make sure you take some measurements before driving over to your local hardware, discount or building supply store.

There are two basic sizes for toilet seats on the market, and you don't want to come home with a seat that doesn't fit your commode.

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

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

  3. Shop for a round seat if your measurement was approximately 16 1/2 inches.

  4. Look for an elongated toilet seat if you measured a length of about 18 1/2 inches.


Compare your measurements with those on the box of a new toilet seat before you buy it.