Are bathtub drains standard?

Bathtub drains are usually located directly under the faucet. Bathtub drains are 1 1/2 inches wide and fit all standard bathtubs ranging from 14 to 26 inches deep. They are this size because they must fit the opening of the P-trap -- also 1 1/2 inches wide -- which is a special pipe that has a sharp bend in it.

All this is further explained here. Also to know is, are tub drains standard?

A standard modern bathtub drain is 1 1/2 inches in diameter -- the width straight across the middle. Rough-in plumbing should be calculated for a 1 1/2-inch pipe. Antique bathtubs, such as historic clawfoot tubs, sometimes have slightly smaller drain openings, often 1 3/8 inches in diameter.

One may also ask, are all bathtub drains the same? Pipe Connection Size A shower tub drain has a 2-inch drain connection, while a tub drain frequently has a 1 ½-inch drain connection, according to Plumbing Supply. The drain connection for your tub is generally the same as the one for your sink, whereas the shower drain connection is slightly larger.

In this regard, are bathtub drain locations standard?

It is roughly 12" from the wall. Some of the newer acrylic tubs actually manage to keep the drain line above the joist level because so many homes are now on slabs. You would not need to buy it just go to the store and measure it.

How do you measure a bathtub drain?

Measure straight down from the center of the overflow to the point at which the drain is mounted to the tub: depending on what's easiest to get to, you can measure from outside the tub down to its underside, or from inside the tub to the tub floor. Do not follow the curve of the tub; measure straight down.