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Shower Pan Calculator — Slope, Mortar & Membrane

Calculate shower floor slope, mortar bed, waterproof membrane, and drain materials

Shower Floor

12 sq ft

Membrane

21 sq ft

Materials

$301

Shower Pan Materials

Floor Area
12 sq ft
Slope: 1.6" at walls → 1" at drain
Membrane
21 sq ft
Tile
14 sq ft

Mortar Bed

Mortar (60 lb bags)6
Volume2.6 cu ft

Cost Estimate

Mortar$48
Membrane$63
Drain Assembly$50
Tile + Thinset$90
Materials Total$301
Professional Install$480 – $960

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What You'll Need

SAKRETE OF NORTH AMERICA 110310 10 lb Sand Mix

$16.894.2
View on Amazon
Oatey PVC Shower Pan Liner Kit Gray 5' x 6'

Oatey PVC Shower Pan Liner Kit Gray 5' x 6'

$36.924.6
View on Amazon
Oatey PVC Shower Pan Liner Gray 6' x 50'

Oatey PVC Shower Pan Liner Gray 6' x 50'

$280.494.7
View on Amazon

Matte Black No Caulk Shower Drain,Welsan 2 Inch Compression Shower Drain with Round Floor Drain Cover, PVC Shower Drain Replacement for Acrylic Fiberglass Shower Base,Stainless Steel Snap in Cover

$21.994.6
View on Amazon

Low Profile Shower Drain Kit for 2” Side Outlet Shower Drain，with 1.5“ Adapter Match 1 1/2 Low Profile Drain，PVC Side Discharge Drain with Perforated Strainer

$20.794.8
View on Amazon

SAKRETE OF NORTH AMERICA 110310 10 lb Sand Mix

$16.894.2
View on Amazon
Oatey PVC Shower Pan Liner Kit Gray 5' x 6'

Oatey PVC Shower Pan Liner Kit Gray 5' x 6'

$36.924.6
View on Amazon
Oatey PVC Shower Pan Liner Gray 6' x 50'

Oatey PVC Shower Pan Liner Gray 6' x 50'

$280.494.7
View on Amazon

Matte Black No Caulk Shower Drain,Welsan 2 Inch Compression Shower Drain with Round Floor Drain Cover, PVC Shower Drain Replacement for Acrylic Fiberglass Shower Base,Stainless Steel Snap in Cover

$21.994.6
View on Amazon

Low Profile Shower Drain Kit for 2” Side Outlet Shower Drain，with 1.5“ Adapter Match 1 1/2 Low Profile Drain，PVC Side Discharge Drain with Perforated Strainer

$20.794.8
View on Amazon

As an Amazon Associate, we earn from qualifying purchases.

Price as of Jun 27, 2026. Product prices and availability are accurate as of the date indicated and are subject to change. Any price and availability information displayed on Amazon at the time of purchase will apply.

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Example Calculations

1Standard Residential

Inputs

ProjectMedium home
ScopeStandard

Result

ResultSee calculator

Enter your dimensions for accurate estimates.

2Large Project

Inputs

ProjectLarge home
ScopeFull

Result

ResultSee calculator

Larger projects need proportionally more materials.

Frequently Asked Questions

Q

How does this calculator work?

Enter your project dimensions and specifications to get material quantities, sizing, and cost estimates based on industry-standard formulas.

  • Input dimensions and project specs for accurate results
  • Calculations use standard industry formulas and sizing tables
  • Results include material quantities and cost ranges
  • Adjust inputs to compare different scenarios
Q

How accurate are these estimates?

Material quantities are within 5–10% of actual needs including waste. Cost estimates use national averages and vary 20–30% by region.

  • Material quantities accurate within 5–10% with waste factor
  • Cost estimates based on national averages, vary by region
  • Sizing follows industry standards and building codes
  • Verify with local codes and professional assessment
Q

Should I hire a professional?

Many aspects are DIY-friendly, but electrical, plumbing, and structural work typically require permits and professional expertise.

  • DIY-friendly: material purchasing, basic assembly, surface work
  • Professional recommended: electrical, plumbing, structural changes
  • Always check local codes and permit requirements first
  • Professional install adds 40–60% but ensures code compliance
Q

What building codes apply?

Building codes vary by jurisdiction but generally follow IRC for residential. Check with your local building department for specific requirements.

  • IRC covers most residential construction requirements
  • Electrical work: NEC applies nationwide
  • Plumbing: UPC or IPC depending on jurisdiction
  • Always pull required permits to maintain insurance coverage

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Last Updated: Jul 13, 2026

This calculator is provided for informational and educational purposes only. Results are estimates and should not be considered professional financial, medical, legal, or other advice. Always consult a qualified professional before making important decisions. UseCalcPro is not responsible for any actions taken based on calculator results.

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