Calculyn

Drywall Calculator

Estimate how many sheets of drywall you need for a room, plus screws, tape and mud.

Results update as you type.

Sheets needed

214×8 sheets

Includes 10% extra for cuts and mistakes

Net area to cover
600sq ft
Joint tape (approx.)
252ft
Screws (approx.)
672
Joint compound (approx.)
8.4gal
Sheets needed21

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Quick answer

A 16 × 12 ft room with 8 ft ceilings, ceiling included and 40 sq ft of openings needs about 17 sheets of 4×8.

How it works

Add up wall and ceiling area, subtract doors and windows, then divide by the sheet size and add 10% for waste.

Formula

Sheets = (walls + ceiling − openings) × 1.1 ÷ sheet area

Assumptions & limitations

  • Standard waste factor of 10%; complex rooms with many corners may need more.

Frequently asked questions

4×8 or 4×12 sheets?

4×12 sheets mean fewer seams on long walls but are heavier and harder to handle.