Drywall Calculator
Enter room dimensions to get the exact number of 4×8 drywall sheets needed for walls and ceiling, plus joint compound buckets, mesh tape rolls, and a material cost estimate. The calculator automatically adds a 10% waste factor for cuts.
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Top Pick1/2" Drywall Sheets — Home Depot~$13.98/sheet* Affiliate links — we may earn a commission at no cost to you.
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How to Use This Calculator
- 1Enter your measurements in the fields above. Use the units shown next to each field (ft, in, etc.).
- 2Click Calculate to get your material estimate instantly.
- 3Review the highlighted result — it shows the key quantity you need to order.
- 4Use Copy Results to save your estimate, or bookmark the URL — your inputs are encoded in the link.
Pro tip: Always add 10% to your material order to account for waste, cuts, and defects.
Frequently Asked Questions
How much drywall do I need for a 12×12 room?
A 12×12 room with 9-foot ceilings has about 360 sq ft of wall area (minus doors/windows) plus 144 sq ft of ceiling = 504 sq ft total. With 10% waste, you need approximately 17 sheets of 4×8 drywall.
What drywall thickness should I use?
Use 1/2" for most walls and ceilings. Use 5/8" Type X in fire-rated assemblies such as garage walls or floors between living units. Use 3/8" only for curved walls or when layering over existing drywall.