What Size Are RV Toilets? (Full RV Toilet Seat Dimensions)

Part of having a comfortable RV experience is getting a vehicle with the right size toilet. Nothing is worse than having to try to sit on a seat that is too small. Being cramped in a bathroom is never any fun and it certainly isn't adding to your comfort.

What size are RV toilets? The standard RV toilet can measure approx. 15 by 19 by 20 inches but not all toilets in that category will be so generous. Other types of toilets are usually smaller than those measurements. This will depend on the type of toilet you have in your RV.

To learn more about the size of a toilet in an RV, just continue to read our article. It has that information and more. Being comfortable also includes having a size of toilet that matches your body’s frame.

What Size Are RV Toilets?


These important devices actually come in a variety of sizes. There is no real one-size-fits-all as RVs, trailers, and campers all come in different sizes. One model for the gravity flush toilet is measured at 19 by 15 by 18 inches, give or take an inch.

A portable model can be a little smaller as one measures 16 by 16 by 14 inches. The exact measurement of your toilet will depend on many factors. One is the size of the bathroom. Smaller bathrooms will have smaller toilets making the experience a little tricky.

A composting toilet can be a little larger than the standard gravity flush model. One unit measures in at 22 by 20 by 22 inches approx. This gives you a little freedom to find one that is the size you want when you are renovating or adding a toilet to your camper or trailer.

RV Toilet Seat Size

Again, not all RV toilet seats will be the same size. The seat size will depend on the same factors as mentioned in the previous section. One toilet seat size is 15 by 16 inches with a hole size of 8 by 10, give or take a fraction of an inch.

If you are fortunate, you may be able to go to a home supply store like Home Depot or Lowes and replace your RV toilet with a standard home toilet seat. Some RV toilet seats are the same dimensions as the toilets in your home.

One model being sold by a top RV brand name has a toilet seat that only measures 14 1/2 by 15 1/4 inches. it is not a very large seat but then not all RV toilets are that large.

Composting and portable toilets will have a variety of sizes depending on how big or small they are. This is an individual search.

What Is The Height Of an RV Toilet?


It seems that the tallest RV toilet stands about 20 inches high. That is at that one outlet. There may be taller toilets but they may be custom orders. One popular RV brand makes their toilets about 18 inches high but you are assured that you can find smaller toilets if the need arises.

You can get what is called low profile toilets and they reach only up to 14 inches. The standard high-profile toilet generally stops at 18 inches high. If you want to replace the toilet in your current RV with a standard house toilet, that is not a good idea.

House toilets are not made for the road and they use far too much water to flush the waste. Plus, there are far too many moving parts in a standard house toilet that can break down and end up costing you more money.

Will a Regular Toilet Seat Fit an RV Toilet?

They can but they will not fit every model of RV toilet made and installed in all RVs. if the Class A RVs have a large bathroom and toilet, then the chances are good you can replace the RV seat with a house toilet seat.

The thing to consider is where the bolts go to secure the toilet seat to the toilet. These plastic bolts are set to match up with the holes on a regular house toilet. The holes on your RV toilet seat may be a different size plus set at different lengths apart.

A third factor will be the size of the RV toilet bowl. You would have to do some careful measuring to make sure the dimensions of the seat will fit the dimensions of the bowl. That will be the key to finding a regular toilet seat for your RV. Measure twice and buy once.

Do They Make an Elongated Toilet For an RV?

There are 11 types of RV toilets you can place inside your RV. The good news is that if you prefer an elongated bowl, then if your bathroom is big enough, you can buy one for your camper, etc.

They do make an RV elongated bowl toilet. Because of their larger size, these seats and toilets are more comfortable to sit on. Plus, they distribute the weight a lot better than regular round toilets will.

This type of toilet and seat is better for men than for women, for obvious anatomical reasons. The drawback to having one of these toilets in your RV or trailer is that they do take up more space.

If your bathroom is large enough, that should not be a problem. However, when the bathroom is not that large, you may have to bite the bullet and use a round toilet and seat. Measure your bathroom to make sure you have the space to fit one in.

Dometic 320 RV Toilet Size

The approx. size of the 320 is 22 inches from front to back, 18 1/2 inches high, and 14 3/4 of an inch wide. We say approx. because Dometic and other outlets say 18 inches. But that height may not include the toilet seat.

Another outlet says that the Dometic 320 is about 19 3/4 inches tall and that measurement may be including the toilet seat. All the other measurements on that latest outlet’s site are exactly the same as the figures we gave in the first sentence of this section.

These measurements are for the standard-height ceramic toilet. One thing you may find out is that if you order direct from the company you may pay as much as $80 more than if you went through those outlets that sell this brand of toilet. That is the sale price difference but even the regular price is about $40 cheaper than Dometic.

Replacement RV Toilet Seats By Size


This is not going to be a difficult search to make. Many outlets offer replacement toilet seats for sale and they have them in a variety of sizes. Amazon is one marketplace that will have a nice selection.

Then Camping World offers some as well. You just need to go to any RV parts and accessory outlet and you should find the seat in the size you need. The key will be making the right measurements on your part.

These outlets can’t match up the seat correctly if you fail to provide the accurate dimensions of your current toilet. If you need a specific size and shape, then you have to do the work and take good measurements.

Also, do not forget about the color of your current toilet. If you need a perfect match, color is essential. Plus, you can replace your old toilet seat with a slow closing one, if the latter comes in the correct size.

Residential Size RV Toilet


We made mention of this issue earlier. It's not a good idea to replace your RV toilet with a residential toilet. The two units are designed very differently and operate under different logistics.

Then the weight of the residential toilet may be too great and you would end up having to exclude some other needed or wanted product from your RV. If these reasons are not enough to convince you not to do this switch. Then possible the size of your bathroom will.

Most residential toilets will not fit in the majority of RV, trailer, or camper bathrooms. They are quite large and the tank on the back will take up a lot of extra room you may not be able to afford to lose.

All in all, when you have an RV, etc., it is best to use an RV toilet.

Some final words

The size of the RV toilet is the luck of the draw. Whatever model the manufacturer decided to put inside your RV is the one you are stuck with. Those models can be any size or type.

Keep in mind that the manufacturers always look for the cheapest option possible. So you may consider upgrading at some point if you have bathroom space.

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