Outdoor Projects
Plan repeated shade slats or decorative battens after the pergola structure and slat layout have been selected. The calculator converts the covered width into slat count and linear footage while explicitly avoiding rafter sizing, beam spacing, post design, wind/snow loads or code compliance.
Change the defaults to match your project and the product you plan to buy.
Project result
See repeat module, base slat count, spare-adjusted pieces and linear material reference.
At a glance
Planning estimate only. Verify product coverage, package size, supplier specifications and project requirements before purchasing.
Budget scenario
Use a current supplier subtotal or reuse a priced calculator result, then add optional delivery, tax and contingency. Home Measure Lab does not fetch or guess live prices.
Enter a current supplier subtotal or reuse a priced calculator result.
Budget values are local planning inputs, not live quotes. Verify tax treatment, delivery, labor and supplier pricing before purchasing.
Choose the right tool
You need non-structural pergola shade/decorative slat pieces after structure and spacing are selected.
It does not size pergola rafters, beams, posts or structural spans.
Methodology
installed face width + selected gap
Layout input only.
covered width ÷ module, rounded up
Count repeated pieces.
base count × (1 + spare), rounded up
Whole full-length pieces.
purchase slats × slat cut length
Use after structure is set.
Measure the dimension perpendicular to the repeated shade slats; that is the width the slat modules must cover. Measure the actual cut length of each slat separately. Do not use overall pergola footprint dimensions without checking orientation, because swapping slat direction changes both repeat count and cut length. Split zones when a pergola has different roof bays, interruptions or decorative patterns.
Use the installed slat face width and clear gap selected for the project. This calculator rounds to full slat pieces rather than pretending structural members can be spliced efficiently. Confirm material profile, span capability, fastening, thermal movement, wind/snow exposure and any structural or code requirements outside the quantity tool. Spare percentage is for cuts, defects or future matching pieces, not hidden geometry.
Reference
| Input | Controls | Verify before buying |
|---|---|---|
| Covered width | Repeat count | Measure perpendicular to slats. |
| Slat face + gap | Layout module | Use selected spacing. |
| Slat length | Piece length | Measure full cut run. |
| Spare % | Purchase pieces | Keep reserve explicit. |
Questions
No. It is only for non-structural shade/decorative slat quantity after the structure is designed.
No. Shade performance depends on orientation, sun angle and product geometry; gap is simply an entered layout value.
Only if the selected system explicitly permits that detail; this calculator assumes full-length slat pieces.
Planning guides
Outdoor Projects
Measure the width across repeated pergola shade slats and convert a selected face-plus-gap module into full-length decorative slat pieces.
Read guide →Estimate vertical privacy-screen slats and stock pieces from measured screen width, selected slat width and gap, screen height and cut allowance.
Open calculator → Outdoor ProjectsEstimate decking boards and linear feet from deck dimensions, board width, gap, board length and waste.
Open calculator → Outdoor ProjectsEstimate horizontal deck-railing stock from net railing run, rails per section, cut allowance and stock-piece length.
Open calculator →