Drywall Calculator
Sheets, mud, tape, and screws in one pass.
Drywall Calculator
Sheets = ceil(Area × (1 + waste) / sheet area)
Calculated instantly
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What This Calculator Does
The Drywall Calculator estimates how many sheets of drywall a job needs, plus planning quantities for joint compound, tape, and screws. It works from total wall and ceiling area, sheet size, and a waste allowance.
How It Works
Total area is increased by the waste percentage, then divided by the area of one sheet and rounded up. Compound and tape estimates use typical coverage rates for a three-coat finish; screws assume roughly one per square foot, which suits studs at 16 inches on centre.
Example
For 1,000 sq ft of wall and ceiling with 4 × 8 ft sheets and 10% waste, the order area is 1,100 sq ft. That needs 35 sheets, about 4.4 gallons of joint compound, 1,100 ft of tape, and roughly 1,050 screws.
Formula
Sheets = ceil(Area × (1 + waste/100) / (sheet width × sheet length))Compound ≈ Order area / 250 sq ft per gallonA planning estimate for a standard three-coat finish.
Screws ≈ Area × 1.05Assumes framing at 16 in on centre and screws at 12 in along each stud.
Reading the Results
Sheets needed
Full sheets to buy after the waste allowance and rounding up. Retailers sell by the sheet, so a fractional result is never useful.
Joint compound
A rough gallons figure for taping and finishing. Buy one extra container rather than running out mid-coat.
Sources and References
ASTM C840 — Standard Specification for Application and Finishing of Gypsum Board
Fastener spacing and finishing levels
C840 defines the application and finish standards this estimate approximates.
Gypsum Association GA-216 — Application and Finishing of Gypsum Panel Products
Screw spacing and joint treatment
References identify the method or data behind this calculator. Where a standard or tariff changes, the current edition applies, and the assumptions stated above take precedence over a remembered figure.
Frequently Asked Questions
How many sheets of drywall do I need?
Divide the total wall and ceiling area by the sheet area (32 sq ft for 4 × 8), add 10% waste, and round up. For 1,000 sq ft that is about 35 sheets.
Should I use 4 × 8 or 4 × 12 sheets?
Longer sheets mean fewer joints and a faster finish, but they are heavier and harder to handle alone. Use 4 × 12 where two people can manage them; use 4 × 8 for solo work and tight spaces.
How much joint compound do I need?
Plan on roughly 1 gallon per 250 sq ft of board for a three-coat finish. More elaborate corners and arches use more; a level 5 finish uses more again.
Do I need to add waste for drywall?
Yes. Cuts around doors, windows, outlets, and angled ceilings create offcuts. Ten percent is a sensible default; complex rooms often need 15–20%.