Drywall calculator

Calculate drywall sheets, joint compound, tape, and screws needed for a room.

Room length

12.0 ft

Room width

10.0 ft

Ceiling height

8.0 ft

Sheet size

Openings (doors/windows)

Avg opening area

sqft

~21 sqft for a door

Include ceiling

Sheets (4x8)

32 sqft each

Total area

430 sqft

Walls: 352 + Ceiling: 120

Openings deducted

42 sqft

2 x 21 sqft

Joint tape

1 rolls

500 ft rolls

Joint compound

5 gal

All coats

Screws

~645

4 boxes (1 lb)

How to Estimate Drywall

Measure the room's perimeter and multiply by the ceiling height to get wall area. Add ceiling area if you're drywalling it. Subtract door and window openings, then divide by the sheet size to get your count.

Always round up and order 10-15% extrato account for cuts, waste, and mistakes. It's cheaper to return unused sheets than to make a second trip.

Sheet Size Guide

4x8 — Standard, easiest to handle, works for 8' ceilings
4x9 — For 9' ceilings, reduces horizontal seams
4x10 — For 9-10' ceilings
4x12 — Fewer joints on long walls, heavier to handle

These calculators are provided for estimation and educational purposes only.