Round vs elongated toilets
Two inches of porcelain decides how comfortable the toilet is, how easily you get past it, and which seats and bidets will fit.
By Sawyer V. · · How we research
The short answer
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Quick picks
Tap any row for the full write-up. Prices are checked against Amazon rather than remembered — where we have no verified figure the button says so.
| # | Product | Best for | Renter | Price |
|---|---|---|---|---|
| 1 | No photo yet Colony 3 Two-Piece Round-Front Toilet Round-front, 10 in. rough-in, 1.28 gpf and WaterSense certified — the shorter bowl on an otherwise identical toilet. | Bathrooms where you step around the toilet | Owner-only | |
| 2 |  Colony 3 Two-Piece Elongated Toilet The same flush, valve, trapway and water surface as the round version, with the longer, more comfortable bowl. | Any bathroom with the floor to spare | Owner-only |
How to tell which you have
Measure from the midpoint between the two seat bolt holes at the back to the front edge of the rim.
About 16.5 inches is round. About 18.5 inches is elongated. Those two shapes account for almost every toilet in a US home. The full measuring method is on the seat replacement page.
The comparison, point by point
Floor space. Round wins by about two inches of projection into the room. In a compact bathroom — toilet opposite a bath, beside a door swing — that is often the deciding factor.
Comfort. Elongated wins for most adults. The longer bowl gives more support and more room, which is why it has become the default in newer homes.
Flush performance. A tie on this pair. American Standard publishes the same 3 in. flush valve, 2 in. trapway and 9 x 8 in. water surface for both. Shape alone does not change how well a toilet flushes; the valve and trapway do.
Cleaning. Roughly a tie. The elongated bowl has more surface, the round one has tighter curves.
Children. Round is often easier for small children, whose legs do not reach across a longer bowl.
The seat and bidet question
This is the knock-on effect people forget. Seats are shape-specific — an elongated seat overhangs a round bowl, a round seat leaves the front of an elongated rim exposed.
Bidet attachments mostly fit both, because they span the bolt holes rather than the bowl. Bidet seats do not. The round-bowl bidets are here and the elongated ones are here.
If you are replacing the toilet and plan to add a bidet seat later, choose the shape with the better seat selection — which is usually elongated.
Before you change shape
Swapping round for elongated is not just a toilet swap. Check that the extra two inches still leaves comfortable clearance in front, that a door will not hit it, and that the rough-in is right — both toilets here are 10 in. rough-in, which suits small and older bathrooms but not a standard 12 in. drain. Rough-in is explained on the small-bathroom toilet page.
Both toilets rate Owner-only on our install rating. Replacing a toilet is work on the property’s drainage. If you rent and the shape is the problem, the seat is the part you can change — and only within the shape you have.
Every pick in full
2 we would buy. Each carries its Renter-Safe Install Rating, the published specs behind it, and the honest gap in what we know.
1. Best for a small room
Colony 3 Two-Piece Round-Front Toilet
American Standard · 250DB104.020 · best for bathrooms where you step around the toilet
Round-front, 10 in. rough-in, 1.28 gpf and WaterSense certified — the shorter bowl on an otherwise identical toilet.
The American Standard Colony 3 round-front makes this comparison unusually clean: American Standard sells the same toilet in both bowl shapes, so the only thing that changes is the shape.
The round version publishes a 10 in. rough-in, “1.28 gpf / 4.8 Lpf”, WaterSense certification, a 3 in. flush valve, a 2 in. trapway and a 9 x 8 in. water surface.
Choose it when the toilet faces a door, a bath or a vanity and those two inches decide whether you can get past it comfortably.
Renter-Safe Install Rating
- Drilling
- None
- Tools
- Not published
- Time to fit
- Not published
- Power
- None
- Reversible on move-out
- No
Why: Replacing a toilet means draining and removing the old one, fitting a new wax ring to the closet flange and reconnecting the supply. It is plumbing work on the property's drainage and is never a tenant's change.
Read from published documentation, not from fitting one. American Standard — Colony 3 round-front 10 in. rough toilet, published flush data and warranty. How the verdict is derived: renter-safe ratings explained.
What’s wrong with it
Less comfortable for most adults, and the seat, wax ring and supply line are all sold separately.
What we can’t tell you
American Standard publishes no bowl height and no MaP flush-performance rating. It was sold out on the maker's own store at the time of writing.
Published specifications
| Rough-in | 10 in. |
|---|---|
| Bowl shape | Round-front |
| Flush volume | “1.28 gpf / 4.8 Lpf” |
| Water efficiency | “WATERSENSE CERTIFIED” |
| Flush valve | 3 in. |
| Trapway | 2 in. |
| Water surface | 9 in. x 8 in. |
| Type | Two-piece |
| Seat | “Toilet seat, wax ring and supply lines are not included” |
| Warranty | “Limited Lifetime Warranty on Chinaware; 5-Year Warranty on Mechanical Parts; 1-Year Warranty on Seat” |
| Overall dimensions | Not published in the specification table |
| Bowl height | Not published in the specification table |
| MaP rating | Not published |
Source: American Standard — Colony 3 round-front 10 in. rough toilet, published flush data and warranty
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2. Best for comfort
Colony 3 Two-Piece Elongated Toilet
American Standard · 250CB104.020 · best for any bathroom with the floor to spare
The same flush, valve, trapway and water surface as the round version, with the longer, more comfortable bowl.
The Colony 3 elongated publishes an identical flush specification: 10 in. rough-in, 1.28 gpf, WaterSense certified, 3 in. flush valve, 2 in. trapway, 9 x 8 in. water surface.
Which means that on this pair, elongated costs you nothing in flush performance — only floor. It is the shape most adults find more comfortable and the one most newer US homes are fitted with.
American Standard publishes a limited lifetime warranty on the chinaware and five years on mechanical parts.
Renter-Safe Install Rating
- Drilling
- None
- Tools
- Not published
- Time to fit
- Not published
- Power
- None
- Reversible on move-out
- No
Why: Replacing a toilet means removing the old one, seating a new wax ring on the closet flange and reconnecting the supply. It is work on the property's drainage and never a tenant's change.
Read from published documentation, not from fitting one. American Standard — Colony 3 elongated 10 in. rough toilet, published flush data and warranty. How the verdict is derived: renter-safe ratings explained.
What’s wrong with it
Two more inches into the room, and the seat, wax ring and supply line are not included.
What we can’t tell you
No published bowl height or MaP rating, and sold out on American Standard's store at the time of writing.
Published specifications
| Rough-in | 10 in. |
|---|---|
| Bowl shape | Elongated |
| Flush volume | “1.28 gpf/4.8 Lpf” |
| Water efficiency | “WATERSENSE CERTIFIED” |
| Flush valve | 3 in. |
| Trapway | 2 in. |
| Water surface | 9 in. x 8 in. |
| Type | Two-piece |
| Included | “Color-matched trip lever” — “Toilet seat, wax ring and supply lines are not included” |
| Warranty | “Limited lifetime warranty on chinaware, limited 5-year warranty on all mechanical parts” |
| Bowl height | Not published |
| MaP rating | Not published |
| Availability | Sold out on American Standard's own store at the time of writing |
Source: American Standard — Colony 3 elongated 10 in. rough toilet, published flush data and warranty
#ad Price $224.37 as of October 18, 2026. Prices change; Amazon’s listing is the one that counts. How we’re funded.
Where to buy
Everything recommended on this page, in one place. Each link is an Amazon Associates link — we earn a commission at no extra cost to you, and it never decides a pick.
- Check price on Amazon
Colony 3 Two-Piece Round-Front Toilet
American Standard · 250DB104.020 · Renter verdict: Owner-only
- $224.37View on Amazon
Colony 3 Two-Piece Elongated Toilet
American Standard · 250CB104.020 · Renter verdict: Owner-only
#ad Prices are not shown because we only publish figures we have verified on the day. How we’re funded.
Questions people actually ask
which is better round or elongated toilet
Elongated is more comfortable for most adults; round saves about two inches of floor. On American Standard's Colony 3, which is sold in both shapes, the flush valve, trapway and water surface are identical — so the choice is purely comfort against space.
how do i know if my toilet is round or elongated
Measure from the midpoint between the seat bolt holes to the front edge of the rim. About 16.5 inches is round; about 18.5 inches is elongated.
do elongated toilets flush better than round
Not because of the shape. Flush performance comes from the valve and trapway, and on the Colony 3 both shapes publish the same 3 inch flush valve and 2 inch trapway.
will a round toilet seat fit an elongated toilet
No. Seats are shape-specific — a round seat on an elongated bowl leaves the front of the rim exposed, and an elongated seat overhangs a round one.
Sources
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