About

Contractors often purchase drywall screws in bulk by weight (e.g., 5lb, 25lb, or 50lb buckets). However, installation estimates are based on the number of screws required per sheet of drywall. A standard 4x8 sheet typically requires about 30-40 screws depending on code requirements (spacing). Running out of screws mid-job causes unnecessary downtime.

This tool converts the weight of standard steel Bugle Head drywall screws (Black Phosphate or Zinc Plated) into an approximate quantity. It uses specific industry average weights for #6 and #8 gauge screws, which differ significantly in density from stainless or brass alternatives.

Formulas

The calculation divides the total input weight by the average weight of a single screw unit. The unit weight (w_unit) is derived from industrial sampling of standard steel screws.

N_screws = W_{total_lbs} × 453.59w_{unit_grams}

Reference Data

Gauge & Length	Avg Weight (g/pc)	Count per lb (Approx)	Count per 5lb Box
#6 x 1"	1.25	362	1,810
#6 x 1-1/4"	1.42	318	1,590
#6 x 1-5/8"	1.92	235	1,175
#6 x 2"	2.41	188	940
#8 x 2-1/2"	4.20	108	540
#8 x 3"	5.33	85	425

Frequently Asked Questions

No. Manufacturing tolerances, coating thickness (Zinc vs Phosphate), and slight differences in head design can vary the count by ±5%. Always allow a safety margin.

No. Stainless steel has a different density, and deck screws often have thicker shanks or different head types (Trim, Flat) which significantly change the weight per screw.

Standard code often requires spacing 12 inches on center for ceilings and 16 inches for walls. This typically averages to about 32-40 screws per 4x8 sheet. A 5lb box of 1-1/4" screws (approx 1,590 count) can finish roughly 40-50 sheets.