What size drywall screws do I need?

Use 1-1/4 inch screws for 1/2-inch drywall on walls, 1-5/8 inch screws for 5/8-inch drywall and all ceiling applications (the extra length prevents ceiling panels from sagging off the screws), and 3-inch screws for double-layer drywall installations. The screw must penetrate at least 5/8 inch into the wood framing.

How many drywall screws do I need per sheet?

Plan for 28 to 32 screws per 4x8 sheet of drywall. Screws go into every stud the panel crosses, spaced 8 inches apart on edges and 12 inches apart in the field. Ceiling sheets require closer spacing (every 7 to 8 inches on all framing members) due to gravity loads.

Coarse-thread vs. fine-thread drywall screws — which do I need?

Use coarse-thread screws for wood stud framing, which is the standard in most residential construction. Fine-thread screws are designed for metal stud framing — the tighter thread pitch grips the thin metal without stripping. Using fine-thread on wood studs results in weaker holding power.

How many pounds of drywall screws should I buy?

A 1-pound box contains approximately 150 screws (1-1/4 inch size). At 30 screws per sheet, one pound covers about 5 sheets. For a 75-sheet job, you need about 15 pounds of screws. Buy a 25-pound bucket for the best price per screw and to have extras on hand.

What happens if I drive drywall screws too deep?

Over-driven screws break through the paper face of the drywall, which eliminates the holding power (the paper face is what keeps the screw from pulling through). Each over-driven screw must have an additional screw placed 2 inches away. Use a dimple bit or auto-feed screw gun to set consistent depth.

Can I use drywall nails instead of screws?

Drywall nails are still code-compliant but are rarely used in modern construction because they tend to pop out over time as the framing lumber dries and shrinks. Nail pops create visible bumps in the wall surface that require repair. Screws provide far superior long-term holding power and are the industry standard.

Plasterboard Screw Calculator

Plasterboard screw calculator: How many screws per board? Free estimator — gives total count and boxes needed.

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How to Use This Calculator

1Enter total number of drywall sheets.
2Click Calculate.

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About This Material

Drywall screws are specially designed fasteners with a bugle head that sits flush with the drywall surface without tearing the paper face. Two thread types are available: coarse-thread for wood framing (by far the most common in residential construction) and fine-thread for metal stud framing. Standard lengths are 1-1/4 inches for 1/2-inch drywall on walls, 1-5/8 inches for 5/8-inch drywall and for ceiling applications (the extra length provides better holding power against gravity), and 3 inches for double-layer drywall assemblies. Screws are sold in 1-pound boxes (roughly 150 screws), 5-pound boxes, and 25-pound buckets. A 1-pound box costs $5 to $8, while 25-pound buckets run $30 to $50 and are the most economical for large jobs. Phillips head is standard, but square-drive (Robertson) screws are gaining popularity for their better bit engagement. Always use an auto-feed screw gun or a standard drill with a dimple (depth-setting) bit for consistent screw depth.

Next Steps:

Drywall Sheet Calculator →Joint Compound Calculator →

Installation Tips

•Use an auto-feed screw gun or a dimpler bit on a standard drill.
•Screws should dimple 1/32" without breaking the paper.

Common Mistakes to Avoid

Using drywall nails instead of screws — pops are common.
Using the wrong thread — coarse-thread required for wood framing.

Plasterboard Screw Calculator

How to Use This Calculator

About This Material

Installation Tips

Common Mistakes to Avoid

Frequently Asked Questions

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