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HyreRemodel tools

Drywall calculator

Enter the room’s perimeter and wall height, the ceiling if you are covering it, the openings, and the sheet length.

A drywall calculator divides the area you are covering by the area of one sheet. A 12 × 12 ft room with 8 ft walls and a ceiling, less 40 sq ft of openings, is 488 sq ft. With 10% waste that is 17 sheets of 4 × 8 drywall, or 12 sheets of 4 × 12.

Work out your sheets

Arithmetic on your figures. Nothing is stored or emailed.

Add the length of every wall you are covering.

A typical door is about 20 sq ft; measure yours.

A HyreRemodel planning figure. Your installer’s replaces it.

— Sheets to order
— Area to cover
— Not included

What this assumed —

A quantity, not a quote. Hang and finish labor is on the bid.

Worked example

A 12 × 12 ft bedroom

Walls and ceiling

Perimeter 48 ft × 8 ft high = 384 sq ft of wall. Add the 144 sq ft ceiling and take off 40 sq ft for a door and two windows: 488 sq ft.

Sheets

488 sq ft + 10% waste = 536.8 sq ft. Divided by 32 sq ft per 4 × 8 sheet, that is 17 sheets. In 4 × 12 sheets (48 sq ft), it is 12.

Sheets = (wall area + ceiling − openings) × (1 + waste) ÷ sheet area, rounded up.

Which drywall sheet size to pick

Drywall sheets come 4 ft wide in several lengths. USG’s submittal sheet for one UltraLight panel lists lengths of 8 to 16 ft and widths of 4 ft or 54 in. Local stock is usually narrower than that range, so check what your supplier carries.

Longer sheets mean fewer joints. Fewer joints mean less taping. They are also heavier and harder to carry up stairs, so the installer usually decides.

How smooth the finished wall must be is a separate choice. See drywall level of finish.

What a drywall bid should state

  • Sheet count and thickness

    So two bids price the same material.

  • Level of finish

    Taping and sanding are most of the labor.

  • Moisture- or fire-rated board where needed

    Bathrooms and garage walls can call for a different panel. Ask your building department.

  • Demolition and disposal

    Who removes the old wall and where it goes.

Before an old wall comes down

Built before 1978? Paid work that disturbs more than 6 sq ft of painted surface per room needs an EPA Lead-Safe Certified firm.

Old joint compound and textured ceilings can contain asbestos. Have a sample tested before sanding or demolition.

What the drywall calculator leaves out

The drywall calculator gives no price. Multiply the sheets by the price on your quote. See drywall installation for what drives the labor and what remodeling costs for the bigger picture.

Tape, compound, screws and corner bead are sized from the maker’s label. To paint the new walls, use the paint coverage calculator. To have someone read your plan, plan your remodel.

Questions this calculator answers

How many sheets of drywall do I need?
Add the wall area (perimeter × height) and the ceiling, take off doors and windows, add waste, and divide by the sheet area: 32 sq ft for 4 × 8, 48 sq ft for 4 × 12.
How much waste should I allow for drywall?
The calculator starts at 10%, a HyreRemodel planning figure, not a standard. Rooms with many corners and openings waste more. Your installer’s figure replaces it.
Should I subtract doors and windows?
Subtract large openings like doors and windows. Leave small ones like outlets in; the offcut is rarely reusable.
What sizes does drywall come in?
USG’s submittal sheet for one panel lists lengths of 8 to 16 ft and widths of 4 ft or 54 in. Stock varies by supplier.

Sources and methodology

Figures dated October 22, 2026. Last reviewed .

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