Calculation Results
About This Calculator
Calculate 4x8 and 4x12 sheetrock drywall counts, joint compound (mud) buckets, joint tape rolls, and screw counts with cut waste factors for rooms and ceilings.
Frequently Asked Questions
Should I choose 4x8 or 4x12 drywall sheets?
4x12 sheets reduce the number of vertical butt joints by 25% to 33%, resulting in fewer seams to tape and smoother walls; however, they require two people to carry. 4x8 sheets are much easier for solo DIYers to transport up staircases.
How much joint compound (mud) is needed per drywall sheet?
A general rule of thumb is approximately 0.05 gallons of joint compound per square foot (roughly 1.5 gallons per 4x8 sheet for 3 coats: embed tape, filler coat, finish skim coat), or about one 4.5-gallon bucket for every 7 to 9 sheets.
How many screws should be installed per drywall sheet?
For 16-inch on-center framing, drywall screws should be spaced 12 inches apart on ceilings and 16 inches apart on walls. A 4x8 sheet requires about 32 to 36 screws, while a 4x12 sheet requires about 44 to 48 screws.
Why is a 10% waste factor recommended for drywall?
Cutting around windows, door openings, electrical outlets, and odd ceiling angles creates drop-offs and scrap. A 10% allowance ensures you do not run short mid-project.