Flooring & Tile

Deck Mud Calculator

Calculate deck mud for shower pans, pre-slope layers, floor mud, and flat mortar beds from dimensions or a known flat-bed area, with bag count, mix split, and waste.

Written by Arthur Weng Reviewed July 14, 2026 Sources

Flooring & Tile

Calculator inputs

Quick startChoose a common size, then adjust any field.

Project area

Use length and width for sloped beds. A known square-foot area can replace dimensions for flat beds.

Application typeDrain typeKnown flat-bed area (optional)sq ftFor a flat mortar bed, enter square footage directly. Sloped shower pans still need length and width so the slope run can be calculated.Lengthselected unitWidthselected unitUnit

Bed design

Minimum thickness at drain or base thicknessinSlope per footin/ftInclude pre-slope layerAdds a second estimated sloped layer using the same area and slope assumptions.

Material and purchase adjustment

Mix ratioBag typeWaste factor%CurrencyYour bag or mix price (optional)$/bag

Custom mix and yieldUse these values only when they match the mix or product label you plan to use.

Custom sand partspartsCustom cement partspartsCustom bag yieldcu ft/bagUsed only when Custom yield below is selected.

Enter your own local prices or fees only if you want a cost estimate.

Calculated in your browser.Project dimensions stay on this device. Review the assumptions below before buying material.

Deck Mud Calculator Results

Results update in your browser as you edit inputs. Use the shopping-list button for a printable project summary.

Enter project dimensions to calculate material quantity.

Detailed guide

Need the assumptions, examples, and troubleshooting?

The calculator stays focused here. The supporting reference has moved to its own page.

Read the Deck Mud Calculator guide