When buying a new toilet or upgrading your current one, it’s essential to consider the toilet dimensions for your space, comfort, and needs.
This guide tells you everything you need to know about toilet dimensions to help you make an informed decision.
| Toilet type | Width (inches/cm) | Length (inches/cm) | Height (inches/cm) |
| Standard toilet | 14-15 / 35.56-38.1 | 27-30 / 68.58-76.2 | 14-16 / 35.56-40.64 |
| ADA toilet | 14-15 / 35.56-38.1 | 27-30 / 68.58-76.2 | 17-19 / 43.18-48.26 |
| Elongated toilet | 14-15 / 35.56-38.1 | 18-19 / 45.72-48.26 | 14-16 / 35.56-40.64 |
| Round toilet | 14-15 / 35.56-38.1 | 16-17 / 40.64-43.18 | 14-16 / 35.56-40.64 |
| Small toilet | 14-15 / 35.56-38.1 | 24-25 / 60.96-63.5 | 14-16 / 35.56-40.64 |
| Comfort height toilet | 14-15 / 35.56-38.1 | 27-30 / 68.58-76.2 | 17-19 / 43.18-48.26 |
| Wall-hung toilet | 14-15 / 35.56-38.1 | 21-24 / 53.34-60.96 | Depends on installation height |
| Composting toilet | 19-21 / 48.26-53.34 | 33-35 / 83.82-88.9 | Varies, often taller than standard |
| Corner toilet | 18-20 / 45.72-50.8 | 32-34 / 81.28-86.36 | 14-16 / 35.56-40.64 |
| Toilet seat | 14-15 / 35.56-38.1 | 16-18 / 40.64-45.72 | – |
Standard toilet dimensions
The average toilet used in most bathrooms is typically around 14 – 15 inches (35.56 – 38.1 cm) wide, 27 – 30 inches (68.58 – 76.2 cm) long, and 14 – 16 inches (35.56 – 40.64 cm) high. They’re built to fit just right in most bathrooms.
ADA toilet dimensions
ADA toilets are designed for accessibility, ensuring that people with mobility challenges are comfortable. According to ADA guidelines, the height from the floor to the toilet seat must be 17 – 19 inches (43.18 – 48.26 cm).
Elongated toilet dimensions
Made to provide a bit of extra space for comfort, elongated toilets usually measure about 18 – 19 inches (45.72 – 48.26 cm) in length and 14 – 15 inches (35.56 – 38.1 cm) in width.
Round toilet dimensions
Round toilets are great space-savers in tighter bathroom spaces. They’re typically about 16 – 17 inches (40.64 – 43.18 cm) long and 14 – 15 inches (35.56 – 38.1 cm) wide.
Small toilet dimensions
Tiny toilets are a must-have for compact bathrooms, such as airplane bathrooms. They are roughly 24 – 25 inches (60.96 – 63.5 cm) long and 14 – 15 inches (35.56 – 38.1 cm) wide.
Comfort height toilet dimensions
Comfort height toilets, also known as right height toilets, are a solution for tall individuals with knee or back issues, or those who prefer a higher seat. They are about 17 – 19 inches (43.18 – 48.26 cm) tall.
Wall-hung toilet dimensions
Toilets fixed to the wall free up valuable floor space. They typically measure around 14 – 15 inches (35.56 – 38.1 cm) in width and 21 – 24 inches (53.34 – 60.96 cm) in length.
Composting toilet dimensions
An eco-friendly option and a fantastic solution for spaces without plumbing, composting toilets vary in size. But they usually measure about 19 – 21 inches (48.26 – 53.34 cm) wide and 33 – 35 inches (83.82 – 88.9 cm) long.
Corner toilet dimensions
Designed to fit snugly into bathroom corners, corner toilets usually have a width of 18 – 20 inches (45.72 – 50.8 cm) and a length of 32 – 34 inches (81.28 – 86.36 cm).
Toilet seat dimensions
Toilet seats are typically 14 – 15 inches (35.56 – 38.1 cm) wide and 16 – 18 inches (40.64 – 45.72 cm) long. But non-standard seats can vary significantly in dimensions, so it’s always good to measure before buying a replacement.
Toilet drain pipe size
A toilet drain pipe has a diameter of 3 – 4 inches (7.62 – 10.16 cm), which helps keep everything flowing smoothly and reduces the risk of clogging.
How to measure a toilet
Start by measuring the toilet’s width – the distance from one side to the other at the widest point. Proceed to the length – the distance from the back of the toilet tank to the front of the bowl. Finally, shift your attention to the height – the distance from the floor to the top of the bowl or seat, depending on your requirement.
How to measure a toilet seat
Begin by measuring the seat’s width at the widest point. Next, measure the length from the center front of the seat to the center of the hinges between the seat and the lid.
How to measure toilet height
For the toilet height, measure the distance from the floor to the top of the seat. If the toilet doesn’t have a seat, just measure to the top of the bowl.