Question 1

How many sheets of drywall do I need for a room?

Accepted Answer

Divide the total wall area (and ceiling, if applicable) by 32 square feet (the area of a standard 4x8 sheet) and round up. A typical 12x12 room with 8-foot ceilings needs about 18 sheets for walls alone, or 22-23 with the ceiling.

Question 2

How much joint compound do I need?

Accepted Answer

Plan on roughly one gallon of pre-mixed joint compound per 100 square feet of drywall. This covers three coats over seams and screw holes. You will need about 3.5 gallons (one box) per 400 square feet.

Question 3

Should I drywall the ceiling too?

Accepted Answer

Drywall ceilings are standard in most finished rooms. Toggle the "Include Ceiling" option in our calculator to add ceiling area to your estimate. Ceiling drywall often uses the same 4x8 sheets.

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