Drywall Calculator
How many drywall sheets, mud, and tape a room needs — walls and ceiling.
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Hanging drywall is straightforward; making it disappear under paint is the skill. Tight, screwed-not-blown joints and three patient coats of mud — each wider than the last — are what give you flat, invisible seams.
DifficultyIntermediate
TimeA weekend to hang a room; finishing adds a day or two for coats to dry
SkillsHanging is easy; taping and mudding take a feel that comes with practice
Tools you'll need
- Drywall screw gun or drill with depth setting
- Drywall saw / rotary cutout tool
- T-square and utility knife
- 6", 10", and 12" taping knives + mud pan
- Pole sander and sanding sponge
- Drywall lift for ceilings (rent)
Step by step
- Hang ceilings first, then walls Do ceilings before walls so wall sheets support the ceiling edges. Run sheets perpendicular to the framing.
- Stagger the seams Offset end joints so they don't line up — continuous seams crack. Cut openings tight around boxes.
- Set screws to a dimple Drive screws just below the surface to dimple the paper without breaking it — broken paper has no holding power. Space ~12" on walls.
- Tape the joints Embed paper tape in a thin bed of mud over every seam and inside corner; coat screw heads.
- Three coats, each wider Tape coat, fill coat, finish coat — feathering each a few inches wider and letting it dry between. Less mud, more coats beats one thick glob.
- Sand and prime Sand smooth (a light touch and good light), then prime before paint so seams don't flash through.
Common mistakes
Screws driven too deep
Breaking the paper face kills the screw's grip. Set a depth-stop and aim for a slight dimple.
Piling on mud in one coat
Thick mud cracks and sands forever. Use thin coats, feathered wider each pass.
Skipping primer before paint
Bare mud and paper absorb differently and flash. Always prime first.
Safety
- Wear a dust mask when sanding — drywall dust is fine and irritating.
- Sheets are heavy and floppy; use a lift or a helper for ceilings.
Frequently asked questions
How many sheets of drywall do I need?
Enter the room dimensions above — choose walls only or walls plus ceiling, then select 4×8, 4×10, or 4×12 sheets. Waste defaults to 12% and can be changed. The result includes rough mud, tape, and screw allowances.
1/2" or 5/8" drywall?
1/2" for most walls; 5/8" (often Type X fire-rated) for ceilings and garages, where it resists sag and fire.
How many coats of mud?
Three over seams — tape, fill, and finish — feathering each coat wider and sanding lightly at the end.