To find a bidet seat that fits your existing toilet perfectly, you’ll need to assess whether your toilet (1) has a round or elongated bowl (2) has enough space in the back, and (3) has a French curve.

To determine whether your toilet is round or elongated, measure from the center of the bolt holes to the front edge of the bowl. Round toilets have a circular look and measure about 16.5″ inches from front to back whereas elongated toilets have a decidedly oval look and measure around 18.5″ front to back. Since elongated toilets are most common, the majority of bidet seats come in an elongated seat size, though there are plenty of models that offer both elongated and round seat options.

Once you have determined if you need elongated or round, you’ll want to make sure you have enough space between the bolt holes and the front of the tank itself. You’ll need a minimum of 1.5 inches for most seats, but the more the better, as it makes for extra room for adjustments.

Next, you’ll need to determine whether your toilet has a French curve (diagram C). In toilets with a French curve, the porcelain arcs down between the tank and the back of the bowl instead of making a right angle (or near-right angle). Our bidet seats will work with most one- and two-piece toilets (diagrams A and B below), but only a handful will fit on toilets with a French curve (diagram C below). See the list at the end of this article for seats that are compatible with some French curve toilets.

Bidet Seats for French Curve Toilets

Below are our top recommendations for toilets with a French curve. Keep in mind that some French curve toilets won’t accommodate a bidet at all, so we always encourage customers with this style toilet to contact us before purchasing.

Top Pick: Cascade 3000

Second Place Pick: Blooming R1063 Bidet Seat

Third Place Pick: Galaxy GB-5000 Bidet Seat

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