Deck Board Spacing & Fastener Calculator

Calculate your decking material requirements, exact spacing, and fastener counts with professional precision.

Project Parameters

Deck Span (Inches)

Board Length (Feet)

Board Width (Inches)

Target Gap (Inches)

Joist Spacing (On-Center Inches)

* Visual represents the first 5 boards and spacing.

Boards Needed

Linear Feet

Estimated Fasteners (incl. 10% buffer)

Refined Gap Width

Calculated gap to ensure the final board ends perfectly flush at the outer edge of the deck.