How To Measure Bathtub Drain Size

How to Measure Bathtub Drain Size

Measuring the bathtub drain size is a crucial step before installing a new drain or overflow plate. An accurate measurement ensures a perfect fit and prevents water leakage or damage. Here's a comprehensive guide to help you measure your bathtub drain size like a pro:

Step 1: Locate the Drain Opening

Identify the drain opening at the bottom of the bathtub. It's typically circular or square and has a removable drain cover.

Step 2: Measure the Diameter or Width

For circular drains, use a measuring tape or ruler to measure the diameter, which is the distance across the center of the opening. For square or rectangular drains, measure the width, which is the distance between the two opposite sides of the opening.

Step 3: Measure the Depth

Insert a measuring tape or dipstick into the drain opening and measure the depth from the surface of the bathtub to the bottom of the drain.

Step 4: Check the Thread Type

Examine the threads on the inside of the drain opening. Drain openings can have different types of threads, such as NPT or IPS. If possible, remove the old drain and check the threads for a more accurate identification.

Additional Tips:

Use a high-quality measuring tool for accurate results.
Round up your measurements to the nearest standard drain size.
If you're unable to measure the drain yourself, consult a professional plumber.
Keep in mind that some bathtubs may have multiple drain openings, so repeat the measurement process for each drain.

By following these steps, you'll be well-equipped to measure your bathtub drain size accurately and ensure a flawless installation of your new drain or overflow plate.