Shower Pan Sizes by Dimension: 30x60, 48x32, 60x48 and More

Shower pans are sold by dimension, but the dimension is usually nominal: a 60 x 32 pan is the family name, not a cut-to size. The number that decides whether a pan fits is the finished opening between wall surfaces, and the number that decides the plumbing is the drain centre measured from two walls.

Reading a Base Size: Nominal vs Actual

A nominal size describes the family the pan belongs to. The actual outside dimensions may differ by a fraction, and the setting dimension - the space the pan occupies between finished walls - differs again depending on whether the pan has a flanged edge that tucks behind the wall covering. Read both figures from the specification, and measure the opening rather than assuming the title is a cut-to size.

The same principle applies to depth. A pan described as 32 in. deep may have a threshold that projects beyond the wall line, which changes the clear floor space and the position of a sliding door above it. Where the pan and the door are ordered together, both are quoted from the same finished surfaces.

30x60, 48x32, 60x48: What Fits Which Bathroom

MCOCOD's base range covers the 60 in. alcove family in 30 in., 32 in., 34 in. and 36 in. depths with edges, a centre-drain version that also includes 48 x 32 and 48 x 36, and acrylic solid surface bases in 60 x 30 and 60 x 32. All are available with left, right or centre drain depending on the model.

Single-size questions - which base fits a 60 in. opening, and how a nominal size relates to the finished opening - are answered in what shower base fits a 60-inch opening and shower base size and finished opening.

Drain Position Within Each Footprint

Each footprint exists in more than one drain position, and the position is fixed at manufacture. Centre drains suit new construction where the trap can be placed freely; left and right drains exist so a pan can drop over an existing tub drain. Offset positions cover the cases where the trap sits near one end but not hard against the wall.

Measure the trap from two reference walls and compare with the specification before ordering. If the trap has to move, expect to open the subfloor and to confirm the joist direction, since a waste run that crosses a joist is a different job from one that runs alongside. Where the existing drain cannot be matched by any stock position, a made-to-measure pan is the alternative to moving the plumbing.

Matching a Door and Surround to the Base

The base sets the width the door has to cover, and MCOCOD door series are quoted against 60 in. and 48 in. widths as well as against guide rail lengths of 48 in. to 120 in. The wall surround then follows the same nominal width: a 60 in. surround with a 60 in. base and a 60 in. door is a system, while three components from three sources with the same nominal size can still disagree at the corner by a few millimetres.

Depth affects door choice as much as width. A 30 in. deep alcove works with a sliding door but leaves little floor once a swinging door opens inward; from about 32 in. deep, hinged and pivot doors become comfortable.

When Your Opening Falls Between Sizes

Openings between standard sizes are common in older houses and after re-tiling, because the finished opening shrinks or grows by the thickness of the wall covering. The options are a pan with a trimming allowance, a made-to-measure pan, or a filler at the perimeter. Filling is the least attractive because it adds a joint in the wettest part of the shower.

The full range of footprints and what each one fits is set out in the standard shower pan size chart, with custom sizing covered in the guide to made-to-measure pans.

Measuring a Rough Opening for a Specific Size

Measure the opening width at three heights using the narrowest reading, then the depth from the back wall to the front plane of the base at both ends, then the drain centre from both reference walls. Add the finished wall thickness where the walls are not yet covered, and note whether the pan sets against studs or finished surfaces.

Then check square: compare the diagonals and hold a level against each wall. A pan set into an out-of-square opening leaves a tapered joint at one end, which is both visible and difficult to seal. Plumbing and building code provisions for the receptor, trap and drain connection are published at iccsafe.org; wet-area methods are published by the Tile Council of North America and catalogued on the Whole Building Design Guide; and where a previous base has leaked into the floor, the EPA moisture guidance describes what has to be checked.

Converting Between Inch and Metric Sizes

US pans are specified in inches and most imported stock is made to inch dimensions, so metric equivalents are approximations rather than alternative sizes. A 60 in. pan is about 1524 mm, and a 32 in. depth is about 813 mm; treating 1500 mm as the same product leads to a 24 mm difference that is visible at the wall.

For a project specified in metric, the practical approach is to work in the units the product is made in, and to state the finished opening in those units when ordering. Component-level expectations and test methods for bases and the glazing above them are published by ASTM International and described in the architectural glazing provisions of 16 CFR Part 1201.