What are you counting?
Pick the member — the math adjusts.
Pick a member type to continue.
How far do they span?
The clear distance they cross — wall to wall, or wall to beam.
Measure the clear span — not including the supports.
On-center spacing
Your joist count
Buy this many boards
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💡 Pro field tips
🧰 Tools you'll need
Tap to check off as you load up.
Est. project cost (optional)
File this estimate under a job name or PO to track what to order. Leave blank to file under "General".
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