Sheetrock Calculator
Enter your measurements
Extra to cover cuts, breakage, and mistakes.
Results
- 4×8 sheets14 sheets
- 4×12 sheets9alternative size
- Joint compound1 boxes
- Screws2 lb
- Tape154 ft
Estimated cost
per 4×8 Sheetrock panel (material)
Material cost is per 4×8 Sheetrock panel (1/2" standard) at retail; specialty panels such as UltraLight, moisture-resistant, or Type X fire-rated run toward or above the high end. Installed cost per panel reflects a drywall contractor hanging and finishing to a paint-ready Level 4 or 5 finish, including labor, compound, tape, and screws — it does not include priming or painting.
Estimate only — prices vary by region, supplier, and season. Get a local quote before buying.
This Sheetrock calculator figures out exactly how many panels you need for a drywall project — walls, ceilings, or both — along with the joint compound, tape, and screws to finish the job. "Sheetrock" is USG's registered brand name for gypsum board; the panel dimensions and coverage math are identical to generic drywall, so this calculator works regardless of which brand you buy. Gypsum panels are sold individually at big-box stores in two common sizes: the standard 4×8 (32 sq ft) and the longer 4×12 (48 sq ft), which cuts the number of butt joints on long or tall walls. A 10% waste factor is a reasonable default for straightforward rectangular rooms; bump it to 15% when you have lots of windows, doors, angled cuts, or a first-time installer doing the work. Joint compound is sold in 4.5-gallon ready-mixed buckets that cover roughly 450 sq ft over three coats, and drywall screws typically come in 1 lb boxes. The calculator outputs realistic quantities of each so you can build a complete shopping list — sheets and consumables — before heading to the store.
How it’s calculated
Sheets = Wall + ceiling area ÷ sheet size (4×8 = 32 sq ft, 4×12 = 48 sq ft), plus waste.
Worked example
For a room with 48 linear feet of walls at standard 8-foot height and a 10% waste allowance, the calculator returns 14 sheets of 4×8 panels (or 9 sheets of 4×12), along with 1 bucket of joint compound, 2 lb of screws, and 154 feet of drywall tape. That output gives you a single, ready-to-use shopping list covering every consumable the taping and finishing stage requires, not just the panel count.
Inputs
- Total wall length
- 48 ft
- Wall height
- 8 ft
- Waste / overage
- 10 %
Result
- 4×8 sheets
- 14 sheets
- 4×12 sheets
- 9
- Joint compound
- 1 boxes
- Screws
- 2 lb
- Tape
- 154 ft
- Estimated material cost
- $168 – $280
Materials & pricing near you
Sheetrock and competing gypsum panels are sold by the individual sheet at Home Depot, Lowe's, and most independent lumber yards. Standard 1/2-inch panels run roughly $12–$20 per 4×8 sheet at retail depending on region and product tier; USG UltraLight panels and moisture-resistant (green board) or mold-resistant (purple board) variants sit at the higher end. Rural areas often see higher prices due to freight. Most retailers have no minimum for in-store pickup, but delivery orders frequently carry a minimum purchase or a flat delivery fee. No permit is typically required for a like-for-like drywall repair or replacement, though new construction and additions follow local building codes on panel type — fire-rated 5/8-inch Type X is mandated on garage-to-living-space walls and ceilings in most jurisdictions, for example.
Frequently asked questions
What size Sheetrock panels should I buy — 4×8 or 4×12?
4×12 panels (48 sq ft each) are the better choice for 8- or 9-foot walls because a single sheet hung horizontally can cover the full wall height with fewer or no butt joints — the hardest seams to hide. The trade-off is weight and handling: a 1/2-inch 4×12 panel weighs around 82 lb compared to about 57 lb for a standard 4×8, so you'll likely need a second person or a drywall lift. For ceilings and short knee walls, 4×8 panels are far easier to maneuver.
How much joint compound do I need per sheet of drywall?
A rough rule of thumb is one gallon of pre-mixed compound per 100 square feet of drywall across all coats, which works out to roughly one 4.5-gallon bucket per 400–450 square feet of finished surface. USG rates its standard Sheetrock all-purpose bucket at about 450 sq ft. Compound is sold ready-mixed in 4.5-gallon buckets (lightweight versions run about 45–50 lb, conventional closer to 60 lb) or as dry powder. Pre-mixed is easier for DIYers; setting-type 'hot mud' powder dries faster and is useful for filling deep gaps before finish coats.
How do I measure for Sheetrock if my room has windows and doors?
The standard trade practice is to calculate total wall area as if the openings don't exist, then let the waste factor absorb the difference. This works because the cutoffs from door and window openings are rarely large enough to reuse elsewhere, and it keeps you from coming up short. If a room is mostly glass — like a sunroom — it's worth subtracting the large opening areas and dropping the waste factor to 5–8% instead so you don't badly over-buy.
What thickness of Sheetrock should I use?
Half-inch (1/2") is the standard for interior walls and ceilings in residential construction and is what this calculator assumes. Five-eighths-inch (5/8") Type X is required on garage-to-living-space walls and ceilings for fire separation under most US building codes. Quarter-inch (1/4") panels are used to skin over existing damaged drywall or to bend around curved surfaces. Always check your local code if the wall separates a garage, furnace room, or attached dwelling unit, since fire-rated assemblies are inspected.