Choose the size of the tub based on how much space you have available in your bathroom and how comfortable you want to be when taking a bath. Most bathrooms will fit a 60 x 32 x 18-inch alcove tub
Standard alcove tubs have exterior dimensions of 60 inches in length, 32 inches in width, and 18 inches in depth. Even small bathrooms usually have enough space to accommodate a tub this size.
The size of the inner basin can change depending on the tub surround thickness. It typically measures 55 x 24 inches at the top of the basin. These dimensions decrease to 45 x 22 inches at the bottom of the tub due to the gentle slope of the tub walls.
The exterior dimensions of extra-large alcove tubs are often between 72 inches in length, 36 inches in width, and 20 inches in height. These dimensions offer ample space for virtually everyone who takes pleasure in taking long, peaceful soaks in the tub.