Toilet Seat Size Guide

How to Measure Your Toilet for the Perfect Seat Fit

Finding the right toilet seat size is essential for comfort and proper installation. Follow this simple guide to measure your toilet and determine whether you need a round or elongated seat.

Step 1: Identify Your Toilet Bowl Shape

There are two main toilet bowl shapes:

  • Round: More compact, typically found in smaller bathrooms
  • Elongated: Oval-shaped, offers more comfort and is most common in modern homes

Step 2: Measure Your Toilet Bowl

To accurately measure your toilet bowl, you'll need:

  • A tape measure or ruler
  • A pen and paper to record measurements

Key Measurements:

  1. Bowl Length: Measure from the center of the mounting holes (where the seat attaches) to the front edge of the bowl
    • Round bowls: approximately 16.5 inches
    • Elongated bowls: approximately 18.5 inches
  2. Width: Measure the widest part of the bowl (typically 14-14.5 inches)
  3. Bolt Spread: Measure the distance between the two mounting bolt holes

Step 3: Choose the Right Seat

Based on your measurements:

  • If your bowl length is 16-17 inches, you need a round toilet seat
  • If your bowl length is 18-19 inches, you need an elongated toilet seat

 

Helpful Measuring Tips

What tools do I need to measure?
Just a measuring tape or ruler and something to write down your measurements. No special tools required!

When is the best time to measure my toilet?
Measure before shopping to avoid returns and ensure you order the correct size the first time. It only takes a minute and saves you hassle later.

What if my measurement falls between round and elongated?
If you measure between 17-18 inches, you likely have an elongated toilet. True round bowls are consistently around 16.5 inches.

Do I need to remove my current toilet seat to measure?
No, you can measure with your current seat on. Just measure from the bolt holes to the front rim of the bowl.

What about compact elongated toilets?
Some toilets are 'compact elongated' - they have an elongated bowl shape but shorter length. These typically use elongated bidet seats.

Can I use a photo to help identify my toilet type?
Yes! Take a photo from above and you can often tell - round bowls are more circular, elongated bowls are more oval-shaped.

Round or Elongated?

Choosing the correct toilet size is essential for proper bidet installation.

A bidet seat designed for an elongated toilet won't fit securely on a round bowl, and vice versa. The right fit ensures a stable installation, prevents gaps that affect comfort and hygiene, and gives your bathroom a polished, professional look.

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Frequently Asked Questions

How do I know if I have a round or elongated toilet?

Measure from the center of the mounting bolt holes at the back of your toilet to the front edge of the bowl. Round bowls measure approximately 16.5 inches (42 cm), while elongated bowls measure approximately 18.5 inches (47 cm).

What happens if I order the wrong size bidet seat?

A bidet seat designed for an elongated toilet will overhang and look awkward on a round bowl. Conversely, a round bidet on an elongated toilet will leave gaps and won't sit securely. Always measure before ordering to ensure a perfect fit.

Are all SmartBidet models available in both sizes?

Most of our models are available in both round and elongated sizes, including the SB-1200, SB-2400, SB-2000, and SB-1000. Some premium models like the SB-3000 and SB-2600 are currently only available in elongated size. Check the product page for size options.

Can I install a bidet seat myself?

Yes! Our SmartBidet seats are designed for easy DIY installation. Most customers can install their bidet in 20-30 minutes with just basic tools. Each bidet comes with detailed instructions and all necessary hardware.

How to install SmartBidet

No Plumber Needed – Easy SmartBidet Installation!
Installing your SmartBidet is quick and simple—no plumber required. Just follow our step-by-step video guide.
If you have any questions or need help, our U.S.-based Customer Service team is here for you:
1-800-515-3430
cs@smartbidetusa.com

SB-1200

SB-1000

SB-2000

SB-3000

SB-2400

We're Here to Help

Have questions about which bidet is right for you? Our customer support team is ready to assist with product selection, installation guidance, and any questions you may have. Every SmartBidet comes backed by our comprehensive warranty and commitment to your satisfaction. Contact us today for personalized recommendations based on your toilet size, budget, and desired features.

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