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Round or elongated: how wide is each toilet seat?

Bemis Lannon is round and 14.38 in wide; Mayfair Cassel is elongated and 14 in wide. Both use enameled wood. Width does not decide shape.

Lannon changes shape.

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With no preferences selected: Bemis Affinity Toilet Seat 203SLST 000 is one option to compare.

No hands-on testingMethod and sources

Bemis Affinity Toilet Seat 203SLST 000 · first with a product link

  • Seat material: Plastic.
  • Depth: 18.563 in.
What to note:

Bolt spacing: 5 1/2 in.

View at Bemis

If you choose Elongated for bowl shape, the first option with a product link becomes Mayfair by Bemis Bennet Toilet Seat 1826MBSL 000.

10 models compared; 10 have a product-page link.

The picks

5 options to compare

Compare the details that matter to your setup.

An option to compare

Bemis Affinity Toilet Seat 203SLST 000

Seat material: Plastic.

Key details

  • Depth: 18.563 in.

What to note

Bolt spacing: 5 1/2 in.

Bowl shape: RoundSeat material: PlasticWidth: 14 3/8 in
See all 5 specs
Bowl shapeRound
Seat materialPlastic
Width14 3/8 in
Depth18.563 in
Bolt spacing5 1/2 in

5 of 5 specs available · source checked September 28, 2026 · Source ↗
Bemis · Product page checked September 28, 2026

View at Bemis
Bowl shape: Elongated

Mayfair by Bemis Bennet Toilet Seat 1826MBSL 000

Width: 14 1/8 in.

Key details

  • Bolt spacing: 5 1/2 in.

What to note

Bowl shape: Elongated.

Bowl shape: ElongatedSeat material: Enameled WoodWidth: 14 1/8 in
See all 5 specs
Bowl shapeElongated
Seat materialEnameled Wood
Width14 1/8 in
Depth18.563 in
Bolt spacing5 1/2 in

5 of 5 specs available · source checked September 28, 2026 · Source ↗
Mayfair by Bemis · Product page checked September 28, 2026

View at Mayfair by Bemis
Seat material: Enameled Wood

Bemis Lannon Toilet Seat 743SL 000

Seat material: Enameled Wood.

Key details

  • Width: 14 3/8 in.

What to note

Bolt spacing: 5 1/2 in.

Bowl shape: RoundSeat material: Enameled WoodWidth: 14 3/8 in
See all 5 specs
Bowl shapeRound
Seat materialEnameled Wood
Width14 3/8 in
Depth16 3/4 in
Bolt spacing5 1/2 in

5 of 5 specs available · source checked September 28, 2026 · Source ↗
Bemis · Product page checked September 28, 2026

View at Bemis
Seat material: Soft

Bemis Toilet Seat 514EC 000

Seat material: Soft.

Key details

  • Width: 15 in.

What to note

Bolt spacing: 5 1/2 in.

Bowl shape: RoundSeat material: SoftWidth: 15 in
See all 5 specs
Bowl shapeRound
Seat materialSoft
Width15 in
Depth17 1/8 in
Bolt spacing5 1/2 in

5 of 5 specs available · source checked September 28, 2026 · Source ↗
Bemis · Product page checked September 28, 2026

View at Bemis
Also compare 5

Bemis Woodland Toilet Seat 504SLECP 000

Bowl shape: Round.

Key details

  • Width: 14 3/8 in.

What to note

Bolt spacing: 5 1/2 in.

Bowl shape: RoundSeat material: Enameled WoodWidth: 14 3/8 in
See all 5 specs
Bowl shapeRound
Seat materialEnameled Wood
Width14 3/8 in
Depth16 7/8 in
Bolt spacing5 1/2 in

5 of 5 specs available · source checked September 28, 2026 · Source ↗
Bemis · Product page checked September 28, 2026

View at Bemis

Comparing Bemis Affinity Toilet Seat 203SLST 000 · Bemis Lannon Toilet Seat 743SL 000

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The facts that differ

Choose up to three models to compare side by side.

3 identical specs shown. Details that do not apply to these models are omitted.

Published specification comparison
SpecBemis Affinity Toilet Seat 203SLST 000No preferences selected.Bemis Lannon Toilet Seat 743SL 000No preferences selected.
Bowl shapeRoundRound
Seat materialPlasticEnameled Wood
Width14 3/8 in14 3/8 in
Depth18.563 in16 3/4 in
Bolt spacing5 1/2 in5 1/2 in

Bemis Affinity Toilet Seat 203SLST 000

No preferences selected.

Bowl shape
Round
Seat material
Plastic
Width
14 3/8 in
Depth
18.563 in
Bolt spacing
5 1/2 in

Bemis Lannon Toilet Seat 743SL 000

No preferences selected.

Bowl shape
Round
Seat material
Enameled Wood
Width
14 3/8 in
Depth
16 3/4 in
Bolt spacing
5 1/2 in

Bemis Affinity Toilet Seat 203SLST 000

View at Bemis

Bemis Lannon Toilet Seat 743SL 000

View at Bemis

Compare all 10 models

— = no verified listing yet. The published order is independent of links.

All models and their decision specs
ProductHow it comparesKey specCompareAction
Bemis Affinity Toilet Seat 203SLST 000
Compared with Bemis Lannon Toilet Seat 743SL 000: seat material, Plastic vs Enameled Wood.
Bowl shape: RoundView at Bemis
Bemis Lannon Toilet Seat 743SL 000
Compared with Bemis Toilet Seat 514EC 000: seat material, Enameled Wood vs Soft.
Bowl shape: RoundView at Bemis
Bemis Toilet Seat 514EC 000
Compared with Bemis Woodland Toilet Seat 504SLECP 000: seat material, Soft vs Enameled Wood.
Bowl shape: RoundView at Bemis
Bemis Woodland Toilet Seat 504SLECP 000
Compared with Mayfair by Bemis Bennet Toilet Seat 1826MBSL 000: bowl shape, Round vs Elongated.
Bowl shape: RoundView at Bemis
Mayfair by Bemis Bennet Toilet Seat 1826MBSL 000
Compared with Mayfair by Bemis Cassel Toilet Seat 1847SLOW 000: width, 14 1/8 in vs 14 in.
Bowl shape: ElongatedView at Mayfair by Bemis
Mayfair by Bemis Cassel Toilet Seat 1847SLOW 000
Compared with Mayfair by Bemis Greenleaf Toilet Seat 1860SL 000: seat material, Enameled Wood vs Plastic.
Bowl shape: ElongatedView at Mayfair by Bemis
Mayfair by Bemis Greenleaf Toilet Seat 1860SL 000
Compared with Mayfair by Bemis Linden Toilet Seat 1843SLOW 000: seat material, Plastic vs Enameled Wood.
Bowl shape: ElongatedView at Mayfair by Bemis
Bemis Affinity Toilet Seat 203SLST 000
Compared with Bemis Lannon Toilet Seat 743SL 000: seat material, Plastic vs Enameled Wood.
Bowl shape: Round
View at Bemis
Bemis Lannon Toilet Seat 743SL 000
Compared with Bemis Toilet Seat 514EC 000: seat material, Enameled Wood vs Soft.
Bowl shape: Round
View at Bemis
Bemis Toilet Seat 514EC 000
Compared with Bemis Woodland Toilet Seat 504SLECP 000: seat material, Soft vs Enameled Wood.
Bowl shape: Round
View at Bemis
Bemis Woodland Toilet Seat 504SLECP 000
Compared with Mayfair by Bemis Bennet Toilet Seat 1826MBSL 000: bowl shape, Round vs Elongated.
Bowl shape: Round
View at Bemis
Mayfair by Bemis Bennet Toilet Seat 1826MBSL 000
Compared with Mayfair by Bemis Cassel Toilet Seat 1847SLOW 000: width, 14 1/8 in vs 14 in.
Bowl shape: Elongated
View at Mayfair by Bemis
Mayfair by Bemis Cassel Toilet Seat 1847SLOW 000
Compared with Mayfair by Bemis Greenleaf Toilet Seat 1860SL 000: seat material, Enameled Wood vs Plastic.
Bowl shape: Elongated
View at Mayfair by Bemis
Mayfair by Bemis Greenleaf Toilet Seat 1860SL 000
Compared with Mayfair by Bemis Linden Toilet Seat 1843SLOW 000: seat material, Plastic vs Enameled Wood.
Bowl shape: Elongated
View at Mayfair by Bemis
10 catalog models

How the comparison works

Your choices are compared with each model’s product details. A missing or conflicting value stays unknown and cannot satisfy a choice you select. The starting order helps you browse; it does not rate real-world performance.

Source dates appear with each link below. A source date does not confirm today's price or stock.

Finder methodologyReport a correction
Sources for all 10 models
  • Bemis Affinity Toilet Seat 203SLST 000: Source 1 ↗ · September 28, 2026
  • Bemis Lannon Toilet Seat 743SL 000: Source 1 ↗ · September 28, 2026
  • Bemis Toilet Seat 514EC 000: Source 1 ↗ · September 28, 2026
  • Bemis Woodland Toilet Seat 504SLECP 000: Source 1 ↗ · September 28, 2026
  • Mayfair by Bemis Bennet Toilet Seat 1826MBSL 000: Source 1 ↗ · September 28, 2026
  • Mayfair by Bemis Cassel Toilet Seat 1847SLOW 000: Source 1 ↗ · September 28, 2026
  • Mayfair by Bemis Greenleaf Toilet Seat 1860SL 000: Source 1 ↗ · September 28, 2026
  • Mayfair by Bemis Linden Toilet Seat 1843SLOW 000: Source 1 ↗ · September 28, 2026
  • Mayfair by Bemis Shell Toilet Seat 22ECA 000: Source 1 ↗ · September 28, 2026
  • Mayfair by Bemis Traditional Toilet Seat 25ECA 000: Source 1 ↗ · September 28, 2026

A round seat can still be wider than an elongated seat

The seat widths run from 14 to 15 in. Mayfair by Bemis Cassel Toilet Seat is elongated and 14 in wide, while the round options include the 15 in-wide Soft design from Bemis. Choose your bowl shape before using the width ceiling; narrower does not mean round.

Mayfair by Bemis Bennet Toilet Seat uses enameled wood, while Mayfair by Bemis Greenleaf Toilet Seat uses plastic. Soft is a construction description, not a specified chemical material. This is a comparison of seat measurements and maker material labels, without seating or hinge-use trials.

Bolt spacing is shared; bowl fit still needs a drawing

All 10 seats give 5.5 in bolt spacing, so that measurement does not separate the choices here. Compare the selected seat's measurement drawing with your bowl before buying. Overall seat depth is a seat dimension, not a substitute for measuring the toilet.

Bowl shape, material and width help eliminate unwanted designs, but cannot settle every fit question. At the destination page, verify the named seat and size rather than relying on a similar-looking family name.

Before you buy

Are all bolt spreads identical here?

The ten entries give 5.5 in bolt spread. Before you order, that shared figure still cannot establish fit without bowl dimensions and the selected model’s installation drawing. Bemis Lannon is round and 14.38 in wide; Mayfair Cassel is elongated and 14 in wide. Both use enameled wood. Width does not decide shape. Consider Cassel if you want the narrower elongated option. Lannon changes shape. Width and overall depth cannot establish bowl fit; compare bolt spacing and the exact measurement drawing.

Can I choose plastic rather than enameled wood?

Bemis Affinity is a round plastic design; Mayfair Greenleaf is elongated plastic. Bemis 514EC uses the maker’s “Soft” material category, which stays unexpanded.

Do the entries count colors or sizes as extra designs?

Each is a distinct named design or construction. Variant colors and sizes do not add entries. Read the current exact offer for pricing and product details.