How to Determine the Size of a Bathtub

Quck answer

To measure the dimensions of a bathtub, follow these steps:

1. Use a measuring tape to measure the length of the bathtub from one end to the other. Start from the inside of the tub, measuring from the top edge to the bottom.

2. Measure the width of the bathtub by placing the measuring tape across the widest part of the tub. Again, measure from the inside, from one side to the other.

3. Measure the height of the bathtub by placing the measuring tape at one end of the tub and extending it to the top edge. This will give you the height from the bottom of the tub to the rim.

4. Note down the measurements in inches or centimeters, depending on your preference.

By following these steps, you can accurately measure the dimensions of a bathtub for various purposes, such as purchasing a new one or planning a bathroom renovation.


Not all aspects of renovating a house are challenging. There are many tasks, like measuring your bathtub, that can be easily accomplished without the assistance of a professional. It may seem confusing at first, but the good news is that all you need is a measuring tape and some patience. Bathtubs can be a significant focal point in any bathroom, so it is crucial to ensure that you order the correct size to fit your space.

Finding the Dimensions of a Bathtub

If you want to replace an old tub with a new one, the best approach is to measure the existing bathtub. This is important to ensure that the new tub occupies the same amount of space without leaving any gaps between the tub and the bathroom walls. It is also essential to maintain the same height and depth of the tub so that the water fixtures do not need to be relocated during the replacement process.

To measure your tub, Victoria Plum suggests starting with the length. Begin at the farthest edge of your tub and measure to the opposite extremity. Make sure your measuring tape reaches the outer edges of the tub, not just the inner curve. Focusing only on the inner measurements will result in a misfit bathtub.

The next step is to measure the width, which is the distance from the back edge or wall to the front edge. Then, measure the height from the floor to the highest edge of the bathtub. Finally, don’t forget to measure the inner depth. Place the measuring tape in the deepest part of the tub up to the overflow point.

Different Types of Bathtubs

Many people have alcove bathtubs, which are tubs surrounded by three bathroom walls. However, you are not limited to replacing your tub with another alcove bathtub. One of the advantages of renovating is that you can choose any type of bathtub to replace your current one. Just keep in mind that there may be plumbing adjustments needed to accommodate the new bathtub.

If you prefer a sleek look, there are options like freestanding bathtubs that do not rest against the walls. If you decide to use a freestanding bathtub, measure the distance between the walls and from the back wall to ensure a proper fit. Any tub can be replaced with a different model; you just need to measure the space accurately to avoid delays due to an ill-fitting bathtub.

Important Considerations

When measuring a bathtub, always make sure to measure to the outermost edges of the tub to ensure a proper fit. If the tub has varying heights along the top edge, measure to the highest point to avoid any installation issues later on.

If possible, take all measurements while standing outside the bathtub. This will ensure that you obtain accurate measurements from the correct locations. Lastly, do not rely on average measurements found online. Always take the measurements in person to ensure that no alterations have been made to the original bathtub.

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