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The Complete Guide to Bathroom Drain Sizes (With Measurements)
Standard bathroom drain sizes are 1.5 inches for bathtubs, 2 inches for stand-up showers, and 1.0 to 1.25 inches for bathroom sinks. These measurements refer to the internal diameter of the drain opening. Knowing your drain size is essential for choosing the right hair catcher, stopper, or replacement parts.
Bathtub Drain Size
The standard bathtub drain in North America is 1.5 inches in internal diameter. This has been the industry standard for decades and covers the vast majority of residential bathtubs. Some older tubs, particularly those from the 1950s or earlier, may have slightly different dimensions. TubShroom is designed for standard 1.5-inch bathtub drains and includes adapters for minor size variations.
Shower Drain Size
Stand-up shower stalls use a 2-inch drain in most cases. The drain pipe connects to a drain body that sits beneath a removable cover plate. Some high-end or custom showers use linear drains that are longer and narrower but still connect to a 2-inch pipe. ShowerShroom is designed for standard 2-inch shower drains.
Bathroom Sink Drain Size
Bathroom sink drains typically range from 1.0 to 1.25 inches in diameter. Most use a pop-up stopper mechanism controlled by a rod behind the faucet. SinkShroom is designed for standard 1 to 1.25-inch bathroom sink drains.
Kitchen Sink Drain Size
Kitchen sinks use a 3.5-inch drain opening (standard in North America). If equipped with a garbage disposal, the disposal unit connects to this standard opening. Kitchen SinkShroom is designed for standard 3.5-inch kitchen drain openings.
How to Measure Your Drain
To measure your drain, remove the stopper or cover plate and measure across the opening (the internal diameter) using a tape measure or ruler. Measure the widest point of the opening. For round drains, measure in any direction across the center. This measurement tells you which TubShroom product fits your drain.
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By The TubShroom Team at Juka Innovations
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