Bidet Seat Fitting Guide

First, let's look at whether your toilet is a 1 piece or a 2 piece toilet. A 2 piece is the most common and considered the standard form factor. You will know if it's a 2 piece if your toilet has a separate bowl and tank section. The 1 piece is made with one solid shape that connects the bowl and the tank.

I have a 2 piece toilet, now what?

Great news! Nearly all of the bidets seats on our site will fit your toilet. Your next step would be to determine if you own a round or elongated toilet.

But I have a 1 piece toilet, what about me?

No problem. You still have options, just not as many as the 2 piece toilet has. With 1 piece toilets, the actual shape of each one will determine which bidet seats can fit. Some 1 piece toilets are made with swooping side skirts. Others have a rectangular back that may have more room. For example, below is a photo of a 1 piece toilet with swooping side skirts that would block the installation of a bidet seat depending on the measurements. Note* Only the Alpha JX and the Blooming NB-R1063 will fit the Kohler San Raphael and Santa Rosa 1 piece toilets. Unfortunately, no bidet seats properly fit the Kohler Rialto 1 piece toilet.

Sounds good, how can I tell if I have a round or Elongated toilet?

The easiest way to determine the shape of your toilet is to take a quick measurement. Measure from the center of the bolt holes to the front of the toilet. Measurements under 17" are typically round toilets. Measurements 17'5" or more are typically elongated.

Great! Is there anything else I should know?

Yes, there are two other measurements to consider when measuring your toilet. The first being the distance between the bolt holes. The standard is 5.5" but can range from 5.5" to 7.5". If your bolt holes are within 5.5" and 7.5" you're in luck, most bidet seats are adjustable to fit within that range.

The final measurement to keep in mind is the distance from the bolt holes to the front of the tank. Most bidet seats require at least 1.75" of space. There are only a couple of models that only require 1.5".

The overall length of most Bidets Toilet Seats is 19.5" for Round toilets and 20.5" for Elongated toilets. So to fit a bidet seat, your toilet will need to have an overall length of at least 19.5" for a Round toilet and 20.5" for an Elongated toilet. This can be measured from the the front of the tank to the very front of the toilet.

That's it!

Now you know how to determine which shape bidet seat to order and you'll soon know what all the hype is about.