Standard Bath Size

In Australia, the standard bath size measures anywhere from 1500 to 1700 millimeters in length, and 700 to 750 millimeters in width. There are slight variations on these standard dimensions, but often these are categorised as small or large.

Standard Bath Size
Standard Bath Size


A large bath size, for example, measures 1800 millimeters long or longer. These are best for people over 6 feet tall, who would be uncomfortable in a standard-sized tub. These baths have a width of 800 millimeters or bigger, and are often seen in freestanding baths. 

There are also “small” and “compact” baths. A small bath measures around 1400 millimeters long and 700 millimeters wide, while a compact is even smaller at 1200 millimeters long and 675 millimeters wide. These are best suited for children.  

Bath Tub Size Width Length
Small650 mm 1400 mm
Standard700 mm 1650 mm
Large800 mm 1800 mm

A deeper tub is better for taking baths, but if your tub doubles as a shower and it will be used for that purpose more, you may prefer your tub to be a little shallower, for convenience.

How to choose the correct bathtub dimensions 

When buying a bath, you will refer to them in terms of their length. A majority of baths have a built in width no smaller than 700 millimeters, so you would only have to look for a “1700 mm” bath or a “1650 mm”. 

When building a new house consider a building broker to help you get everything you want in an unbaised way without a builder skewing your decisions. They will help you choose the best bath size for your needs.

When Choosing a bath size to replace your current one, remember that some baths are installed flush to the untiled surface of your wall. Hence, there might be a small difference, and the part of the bath you can measure might be smaller. So long as the difference between the old bath and the new one is within the 10mm to 30mm range, you shouldn’t have any problems. 

Other Factors to Consider 

The wildcard when it comes to choosing a bath is the depth. The standard depth is from 450 to 500 mm, though there are significant variations. There are, for example, soaking baths that can go much deeper than regular ones, and are meant for whole-body immersion. These are worth looking into if you are a tall person, but do not have enough floor space for a long bath. 

Bath tub depth is also an important consideration when it comes to installation. You may want it to be a freestanding tub, wherein a deeper bath needs a more convenient access . If you want it flush to the floor, you would need space to accommodate both the bath and the plumbing. This can be easily done by getting a bricklayer to build in the bath in either internal bricks or face brick. However, keep in mind the brick size so it looks neat and tidy. 

 Another consideration, when choosing bath sizes, is the power & water consumed by it. Remember that a “warm” bath means putting in around 65% hot water, so you need to ensure your current hot water system is capable of pumping out this much hot water. You also need to consider the positioning of your home’s plumbing, as you may need extra piping especially if the bath is a replacement for an old one. 


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