Tile substrate material estimator

Tile Backer Board Calculator

Estimate cement board or tile backer board sheets, screws, seam tape, waste, and rough material cost from the measured tile substrate area. Use it for showers, tub surrounds, floors, or wall tile prep before matching product instructions.

Units

Measured tile substrate area (ft²)Openings or deductions (ft²)Coverage per board (ft²)Waste / cuts (%)Screws per board Screws per box Seam tape per board (ft)Tape roll length (ft)Cost per board ($)Cost per screw box ($)Cost per tape roll ($)

Boards to buy

Screw boxes

Seam tape rolls

Rough cost

Backer board is not waterproofing by itself

This calculator estimates sheets, screws, and tape only. Waterproofing, uncoupling membranes, seams, fastener schedule, floor deflection, thinset type, edge gaps, and manufacturer instructions control the real installation.

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Shower Tile Calculator

Estimate shower tile boxes for the same wet-area scope.

Thinset Calculator

Estimate thinset mortar bags for setting board and tile.

Grout Calculator

Estimate grout after the tile area and joint size are set.

View all

Tile backer board formula

Net surface area = measured area - openings

Boards = net area × (1 + waste %) ÷ board coverage

Screws = rounded boards × screws per board

Tape rolls = rounded boards × tape allowance ÷ tape roll length

Sample takeoff

A 96 ft² shower/tile substrate with 8 ft² of openings, 15 ft² boards, 10% waste, 30 screws per board, and 10 ft tape allowance per board needs about seven boards, 210 screws, and two tape rolls.An 8.9 m² substrate with 0.7 m² of openings, 1.39 m² boards, 10% waste, 30 screws per board, and 3 m tape allowance per board needs about seven boards, 210 screws, and two tape rolls.

Tile Backer Board Calculator FAQ

How many cement boards do I need?+

Subtract openings from the measured tile substrate area, add waste for cuts, then divide by the coverage per board.Subtract openings from the measured tile substrate area, add waste for cuts, then divide by the coverage per board.

Does this include waterproofing membrane?+

No. Cement board and backer board are substrate materials. Use the waterproofing system required by the product and local conditions.No. Cement board and backer board are substrate materials. Use the waterproofing system required by the product and local conditions.

How many screws should I plan per board?+

Use the fastener schedule printed by the board manufacturer. The default is only a planning allowance so you can price screw boxes.Use the fastener schedule printed by the board manufacturer. The default is only a planning allowance so you can price screw boxes.