Pergola calculator: posts, beams, rafters and shade slats
Pergola cost is driven almost entirely by two decisions: how far apart the posts stand, and how tightly the rafters and slats are spaced. The first sets your beam size; the second sets your shade and most of your lumber bill.
Enter footprint, post layout, rafter spacing and slat spacing, and the takeoff returns posts, beams, rafters, slats, structural connectors and footing concrete, with a cut list including the decorative end profiles you plan to cut.
Estimates only — not a quote.
Open the pergola builderIncluded in the takeoff
- Post, beam, rafter and slat counts
- Footing concrete volume per post
- Structural connectors and fasteners
- Cut list with rafter and slat lengths
- Cost estimate by ZIP
Inputs
- Pergola length, width and post height
- Post spacing and count
- Rafter spacing and slat spacing
- Mounting: concrete-set posts or surface anchors
Plan it in 5 steps
- 1Decide freestanding or attached
An attached pergola needs a ledger and flashing detail; freestanding needs a fourth beam line. Choose before pricing.
- 2Square the post layout
Measure both diagonals when marking posts. Out-of-square layout shows in every rafter cut later.
- 3Set spacing for shade
Tighter rafter and slat spacing means more shade and more lumber. Compare two spacings and read the cost difference.
- 4Choose the post base
Concrete-set posts are stiffest; anchors suit existing patios. Both change footing and hardware lines.
- 5Confirm and cut
Verify dimensions, then use the cut list for rafter tails so the profiles match across the run.
Planning guidance only. Every quantity and price is an estimate — confirm dimensions and local requirements before you buy or build.
Run your own numbers
Enter your dimensions and get a material list, cut list and regional cost estimate in a couple of minutes. No account needed to see the takeoff.
Start estimatingBidding pergola builder work for clients?
Contractors and handymen run this pergola builder to build the material takeoff, nest the cut list, check permits by ZIP and hand the client a branded proposal — same visit, before the estimate goes cold.
- Takeoff priced to your ZIP in minutes
- Cut list that trims the lumber order
- Branded proposal and invoice PDFs
Material and cost output is an estimate, never a quote. Permit content is guidance to verify with your local building department.
Frequently asked questions
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