Toilet Dimensions & Size Chart: Standard Measurements
Everything you need to know.
When searching for a new toilet, understanding available sizes and dimensions is essential. Knowing how to measure a toilet helps you determine which size will fit your bathroom layout and ensures the installation process goes smoothly. Use this guide to standard toilet dimensions and measurements to find the right fit for your space
Key Takeaways
- Standard toilets are typically 28–30 inches deep, 20 inches wide, and 27–32 inches high.
- A 12-inch rough-in is most common, but 10- and 14-inch options are also available.
- Leave at least 15 inches from the toilet’s centerline to nearby walls or fixtures and 21 inches in front.
- Measure the rough-in, depth, width, height, and seat height before choosing a new toilet.
What Is the Standard Toilet Size?
Standard toilet dimensions typically measure between 28" – 30" deep, roughly 20" wide, between 27" – 32" high, and have a rough-in that measures between 10" – 14".
Standard Toilet Dimensions Chart
| Measurement | Typical range | How to measure | Shop |
|---|---|---|---|
| Overall depth | 28–30 in | Front rim to tank back | Toilets |
| Overall width | ~20 in | Widest side-to-side point | Toilets |
| Overall height | 27–32 in | Floor to top of tank | OTT storage |
| Rough-in | 12 in (also 10/14) | Wall to bolt center | 12" rough-in |
| Seat height | 15–17 in std | Floor to top of seat | Standard height |
| Comfort height | 17–19 in | Floor to top of seat | Chair height |
Toilet Dimensions: Measurements You'll Need to Know
The most important step in buying a new toilet is making sure it fits. To find the right size for your bathroom, grab a tape measure and jot down these important toilet measurements.
Toilet Seat Height
Seat height is measured from the floor to the top of your toilet seat. When choosing a seat height, consider your height and physical needs. There are three toilet height options: standard, chair, and tall.
- Standard: Typically 15" – 17" off the ground, standard-height toilets are common in most households and are an ideal choice for homes with children.
- Chair: Typically 17" – 19" off the ground, chair-height toilets offer additional comfort and are an ideal choice for those with restricted mobility.
- Tall: Tall toilets have a seat height of greater than 19". Similar to chair-height toilets, these are a great choice for anyone with restricted mobility.
Neighborly Tip!
Read our guides What Is the Standard Toilet Height? and What Is a Chair-Height Toilet & Why One Might Work for You to learn more about toilet seat heights.
Overall Toilet Height
This is the measurement from the floor to the top of your toilet’s tank. This measurement is important as it will ensure that your new toilet can fit into the same space or under any over-the-toilet storage racks.
Toilet Depth
Measure from the front of the toilet rim to the back of the toilet. We recommend having at least 24" of space in front of a toilet. This ensures you will still have plenty of room to move around in front of your toilet and that your bathroom or shower door will not hit it if the toilet is placed near the door.
Toilet Width
Measure from the left edge to the right edge of the toilet tank or seat (whichever is widest) to ensure that it fits in your space. There should be at least 30" of space for your toilet no matter where it is being placed in your bathroom.
Rough-In
The most important toilet dimension when buying a new toilet is the rough-in measurement, which is the distance between the center of the closet bolts and the wall behind the toilet. To do this, take a tape measure and measure from the back wall (not baseboard) to the center of one of the rear closet bolts. The standard toilet dimension for rough-ins is 12", but in some instances it may be 10" or 14".
Neighborly Tip!
For a general overview of everything there is to know when buying a toilet, check out our Toilet Buying Guide.
Round vs Elongated Toilet Dimensions
| Bowl shape | Bolt-to-front | Best for | Shop |
|---|---|---|---|
| Round | ~16.5 in | Small baths / powder rooms | Round toilets |
| Elongated | ~18.5 in | Comfort; primary baths | Elongated toilets |
Toilet Rough-In Sizes
| Rough-in | Distance | Best for | Shop |
|---|---|---|---|
| 10-inch | 10 in wall to bolts | Compact / older homes | 10" toilets |
| 12-inch | 12 in wall to bolts | Most modern bathrooms | 12" toilets |
| 14-inch | 14 in wall to bolts | Deeper set flanges | 14" toilets |
Additional Toilet Measurements
In addition to toilet height or toilet width, there are a few other key measurements that you'll need to keep in mind.
Toilet Clearances
It's required by code to leave 15" of space from the center of the toilet to the nearest wall, vanity, or other object. You should also leave 21" of space in front of the toilet, though maintaining 22" to 30" offers more comfort.
Toilet Bowl Shapes
Toilet bowl shapes can impact a toilet's size and dimensions. There are two options: elongated and round.
- Elongated: Pear-shaped in design, this bowl option offers additional comfort and is typically 2" to 3" longer than a round bowl.
- Round: Circular in design, this bowl shape requires less room, making it an ideal choice when space is at a premium.
Neighborly Tip!
Read our guide Round vs. Elongated Toilets: Which One Is Right for You? for an in-depth breakdown.
How to Measure a Toilet (Step-by-Step)
Taking accurate measurements before you shop prevents costly installation surprises. Follow these step-by-step instructions to measure for your new toilet.
Tools You’ll Need
Tape measure
Notepad and pencil
Step 1: Measure Rough-In
Locate the closet bolts at the base of your existing toilet.
Measure from the finished wall behind the toilet to the center of one of the rear closet bolts.
Important: Measure directly from the finished wall, not from the baseboard or molding. If measuring with no existing toilet installed, measure from the finished wall to the center of the drain pipe flange.
Step 2: Measure Depth, Width & Height
Depth: Measure from the very front edge of the toilet bowl rim to the back edge of the toilet tank or wall.
Width: Measure across the widest point of the toilet, which is typically the left edge to the right edge of the toilet tank or seat.
Overall Height: Measure from the floor straight up to the top of the toilet tank.
Seat Height: Measure from the floor to the top of the toilet seat.
Frequently Asked Questions
What is the standard size of a toilet?
A standard-sized toilet is about 28" – 30" deep, 20" wide, and 27" – 32" high.
What is a toilet rough-in?
A toilet rough-in is the distance from the wall to the drain, which is usually 12".
Are round or elongated toilets bigger?
Elongated bowls often add about 2" of depth, so they are the larger of the two.
What is a comfort-height toilet?
A comfort-height toilet is 17" – 19" tall, which makes it easier for adults and those with mobility issues.
What clearance do I need around a toilet?
Code requires 15" from the toilet centerline to any side wall or vanity (30" total width) and at least 21" in front of the bowl, though 22" – 30" offers greater comfort.
Keep Reading
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