How to Measure for a Toilet Seat

Posted by Laura Pugh on Friday 22nd September 2023, updated on Friday 22nd September 2023

There are lots of reasons to buy a new toilet seat. Maybe your existing seat is broken or looking tired. Maybe you simply fancy updating your bathroom or ensuite. Either way, you’ll want a replacement that’s the right size for your loo. In the guide below, we’ll explain how to measure for a toilet seat. Read on to find out:

The lifespan of a loo seat
Is there a standard seat size?
How to measure for a replacement seat
What shape seat you will need
What if I use a seat that isn’t the right size?

How long do loo seats last?

Loo seats are used daily, so they experience a lot of wear and tear. They tend to last about five years depending on how much they are used, what they are made from and how well they are made.

What is a standard size toilet seat?

It would be fantastic if all seats came in a standard size. Unfortunately, toilet seat sizes do vary. That’s why it's crucial to have accurate toilet seat dimensions before searching for a seat that fits.

How do you measure for a new toilet seat?

To find the right size seat for your toilet pan, you will need to take three or four measurements:

The width of the pan at the widest point
The length of the pan from the fixing holes to the edge of the pan
The distance between the fixing holes – the standard distance is 155cm, but it's worth making sure this is the case

You may also need…

The distance between the fixing holes and the wall or cistern

For standard toilets, the first three measurements will probably be enough. However, certain types of seats, such as raised seats, require space between the fixing holes and the cistern or wall. That’s where the fourth measurement may come in handy.

What shape should I buy?

Take care to match the shape of your seat to the shape of your toilet pan. There are several styles available, including round, square and D-shaped toilet seats. If you choose the wrong shape – such as a square toilet seat for a round pan – the seat won't fit correctly.

What if I use a seat that isn’t the right size?

If you use a seat that isn’t the correct size for your toilet, you may face issues with its appearance or usability. At best, your loo may look a bit odd due to having an oversized or undersized seat. It might also be less comfortable than a loo with a correctly sized seat. At worst, the seat will fit so poorly that it may be awkward or unsafe to use, especially for children or people with mobility issues. You might not even be able to attach the seat at all.

We use our loos regularly, so it’s well worth investing in a seat that fits properly.

Want more advice?

Once you have your measurements, you can be confident about finding a seat that fits your pan. All that’s left is to decide on a style, budget and any additional features, such as soft close hinges. Use our handy toilet seat guide to choose the best toilet seat for you. To ensure a successful fitting, check out our article on how to replace a toilet seat.

Shop the collection

Plumbworld offer a wide selection of loo seats in different colours, shapes, sizes, and materials. We also stock well-known brands including Roca, Bemis and Croydex. Shop the collection today and find the perfect option for your bathroom.

If you're looking for further information on toilet seats and toilets, take a look at the following posts - Are Toilet Seats a Standard Size? - Toilet Seat Buying Guide - How to Replace a Toilet Seat.

We love seeing your bathroom and kitchen makeovers and sharing them on our Instagram page - if you've had a Plumbworld renovation, tag us in your photos to be featured!

We would love to see, so why not share your favourite designs on social media with us?

Find us at:

Facebook | Twitter | Instagram | TikTok | Pinterest

Alternatively, sign-up to our newsletter for the latest offers, newest product launches and advice.

Are you planning a new bathroom or kitchen makeover? Shop online with Plumbworld for guaranteed lowest prices and next day delivery options.

Don’t forget to check out the rest of our blog for more bathroom and kitchen advice.

Posted by Laura Pugh

Based in Worcestershire, Laura is a Content Optimisation Executive at Online Home Retail Ltd. She joined the team in 2021 after five years in the furniture industry. Since graduating from the University of Sheffield in 2011, she has worked for several companies in Birmingham and Worcestershire, including Halfords and Lee Longlands. Laura is a DMI Certified Digital Marketing Professional and has worked in digital marketing since 2015. Her skillset includes content writing, email campaign management, blog management, graphic design, proofreading and website optimisation. She is particularly interested in SEO, UI and content marketing. In both her professional and personal life, Laura loves being in any space where creativity and technology meet. Her hobbies include graphic design, web development, amateur video game development, and writing fiction. Her first collection of short stories was published under a pen name in 2020. She is currently working on her first novel.