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Drywall Calculator

Sheets, screws and joint compound for walls and ceilings — waste factor included.

Room details

You'll need

4×8 sheets0
4×12 sheets (alt)0
Total area0
Screws0
Joint compound0

Sheet counts include a 10% waste factor and are rounded up.

How it works

Wall area = length × height, plus ceiling area if selected. We add a 10% waste factor, then divide by 32 ft² (4×8 sheets) or 48 ft² (4×12 sheets). Screws are estimated at ~32 per sheet and joint compound at 1 gallon per 100 ft² for a three-coat finish.

Sheet tip: 1/2″ drywall for walls, 5/8″ for ceilings. Bigger 4×12 sheets cut joints but need more hands.

Shop drywall materials

Sheets, screws, compound and tools delivered to your job site.

Good to know

Drywall FAQs

What size sheets should I use?

4×8 are standard and easy to handle; 4×12 reduce joints on tall walls. 1/2″ for walls, 5/8″ for ceilings.

How many screws per sheet?

About 32–36 per 4×8 sheet — 12″ on center in the field, 16″ on edges.

How much joint compound?

About 1 gallon per 100 ft² for taping and three finish coats.

Should I add extra for waste?

Yes — 10–15% for cuts, mistakes and repairs. Cut sheets can't be returned.

Can I install drywall myself?

Small rooms, yes. Taping, finishing and ceilings take skill — consider a pro.