Drywall Screw Count and Box Calculator

Drywall screw spacing follows building codes and manufacturer recommendations. Proper fastening prevents nail pops, sagging, and loose panels.

Standard screw spacing:

• Walls: Every 16 inches (40 cm) along studs, and 8 inches (20 cm) along edges
• Ceilings: Every 12 inches (30 cm) along joists, and 8 inches (20 cm) along edges

Screws per sheet (4×8 ft / 1.2×2.4 m), hung horizontally:

• Wall with 16-inch stud spacing: approximately 28–34 screws
• Ceiling with 16-inch joist spacing: approximately 36–40 screws
• Wall with 24-inch stud spacing: approximately 22–26 screws

The formula:

A 4×8 sheet hung horizontally is 96 inches across and 48 inches tall, so it crosses several studs and the screws run down each one.

1. Studs the sheet crosses: 96 in / stud spacing + 1. At 16 inches that is 7 studs; at 24 inches, 5.
2. Screws down each stud: 48 in / screw spacing + 1.
3. The two studs at the sheet’s vertical edges get the tighter edge spacing; the rest get the field spacing.
4. Total per sheet = (2 × edge screws) + (remaining studs × field screws).

Do not add a separate ring of perimeter screws on top of that. The screws along the vertical edges are the edge screws, and counting them twice is how estimates end up near 60 a sheet, roughly double what anyone actually drives.

Screw types and sizes:

• 1-1/4 inch (32 mm): Standard for 1/2-inch drywall on wood studs
• 1-5/8 inch (41 mm): For 5/8-inch drywall or double-layer applications
• Fine thread: For metal studs (grip better in thin metal)
• Coarse thread: For wood studs (standard choice)

Box sizes:

• Small box: 100 screws
• Medium box: 200 screws
• Bulk box: 1,000 screws (best value for large projects)

Tip: Buy 15% more screws than calculated. Dropped screws, misdrives, and stripped heads mean you will always use more than the exact count.
Screws are cheap. Stopping a hang halfway through to drive to the store is not.

Why the sibling page gives a bigger number. The drywall screw spacing calculator runs the same geometry, but it hands you the two spacings instead of picking them, and it defaults to 12-inch field spacing where this page uses 16 on walls. On 20 wall sheets at 16-inch framing that is 34 screws a sheet here against 39 there, before either buffer.
Neither is wrong. Sixteen inches is the code maximum for screws on walls and what most hangers actually drive; twelve is what a careful install or a skim-coated wall gets. Set that page’s field spacing to 16 and the two agree exactly, per sheet. The totals still differ a little, because this page buffers 15% and that one 10%.