How it works
Divide the width by board face width plus gap and round up; edge trimming may change the result.
Simple example
Across 10 ft with 5.5 in boards and 1/8 in gaps, allow about 22 boards.
Outdoor & Landscaping
Deck Board Gap Calculator
Estimate board count across a deck width.
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Common question
Does this include board length?
No. Use the decking calculator for overall board lengths.
This is a planning estimate. Check product instructions, dimensions and site conditions before purchasing or building.