Drywall Screw Calculator
Calculate the exact number of drywall screws needed for your project. This calculator uses ASTM C840 fastener spacing standards to determine screws per sheet and total quantity required.
Drywall Screw Calculator
Calculate exact screw quantities for drywall installation based on ASTM C840 standards.
Quick Answer
Walls (16" o.c. studs): 32 screws per 4×8 sheet
Ceilings (12" o.c. joists): 40 screws per 4×8 sheet
Based on ASTM C840 standard spacing: walls 1.0/sq ft, ceilings 1.25/sq ft
Installation Details
As an Amazon Associate, I earn from qualifying purchases.
Industry Standards Referenced
ASTM C840 - Fastener Spacing(ASTM C840)
View StandardStandard specification for application and finishing of gypsum board, including detailed fastener spacing requirements for different installations.
Key Requirements:
- •Wall fasteners: 12-inch maximum spacing in field, 8-inch at edges
- •Ceiling fasteners: 12-inch maximum in field, 7-inch at edges
- •Wood framing: #6 coarse-thread screws, minimum ⅝-inch penetration
- •Metal framing: #6 fine-thread screws, minimum ¼-inch penetration
- •Fastener head: Dimple surface slightly without breaking paper facing
GA-216 - Gypsum Board Application(Gypsum Association GA-216)
View StandardComprehensive guide covering fastener types, spacing, and installation methods for gypsum board.
Key Requirements:
- •Screw length: 1¼ inches for ½-inch drywall, 1⅝ inches for ⅝-inch
- •Minimum edge distance: ⅜ inch from cut or factory edges
- •Screw type: Coarse-thread for wood, fine-thread for steel studs
- •Drive depth: Set head slightly below surface, dimple without tearing paper
Standards Disclaimer: Standards and codes are subject to periodic updates. Always verify current requirements with local building authorities and professional engineers before beginning construction. Links provided are for reference only.
Want to Learn More?
Gypsum Association standards, sheet sizes, joint compound coverage, and fastener spacing per IRC and ASTM C840.
Read the Drywall Materials GuideHow to Use This Calculator
- Select surface type: Choose wall or ceiling installation.
- Choose sheet size: Select from 4×8, 4×10, or 4×12 sheets.
- Enter quantity: Input the number of drywall sheets.
- Review requirements: See screws per sheet and total pounds needed.
ASTM C840 Fastener Standards
Walls require 1.0 screws per square foot (32 per 4×8 sheet). Ceilings require 1.25 screws per square foot (40 per 4×8 sheet) due to tighter spacing requirements.