Shower Waterproofing Calculator

Membrane and drain system for tile shower installations.

Shower length (ft)

Shower width (ft)

Waterproofed wall height (ft)

Number of walls

Membrane type (1=liquid, 2=sheet)

Seam overlap (inches)

Tab to move between fields

Total membrane area (sq ft)

Floor/pan area (sq ft)9

Wall area (sq ft)72

Material needed (gallons or rolls)2

Seam tape needed (linear ft)25

Tape rolls needed1

Estimated material cost ($)$128

How to Use This Calculator

Enter Shower Length (ft) and Shower Width (ft) — the interior dimensions of the shower enclosure.
Set Waterproofed Wall Height (ft): standard showers require at least 6 ft, steam showers require full ceiling height.
Enter Number of Walls to waterproof (3 for alcove showers, 4 for freestanding).
Select Membrane Type (1=liquid-applied such as RedGard, 2=sheet membrane such as Schluter Kerdi).
Review Total Membrane Area (sq ft) and Material Needed (gallons or rolls) for your product order.
Check Seam Tape (linear ft) and Tape Rolls for corners and transitions, and Estimated Material Cost for budgeting.

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