Building Smarter Terraces: A Custom WooCommerce Calculator That Does the Math

We began by outlining our standard workflow — starting with wireframes to confirm logic, steps, and UI structure. Once the approach was approved, the client provided a Figma design that fully represented the desired user experience. We analyzed the supplied formulas and clarified the calculation rules in detail. The plugin accepts inputs for terrace width (W) and length (L) in centimeters, with constraints of 150 cm maximum spacing for carriers and main beams, and 60 cm for cross beams.

• Carrier columns across width (W): intervalsW = ceil(W / 150), positions from 0…W with even steps.
• Carrier rows along length (L): intervalsL = ceil(L / 150), same rule.
• Main beams: placed at carrier column X-positions.
• Cross beams: start at carrier rows; subdivide each gap so every cross-beam gap ≤ 60 cm.

Counts.

• Main beams = intervalsW + 1
• Cross-beam rows ≈ ceil(L / 60) + 1 (after subdivision)
• Carriers (legs) = (intervalsW + 1) × (intervalsL + 1) (every main-beam × carrier-row intersection)

Example (470 × 530 cm):

Across 470 → gaps 118, 118, 118, 116 → 5 main beams

Along 530 → gaps 132, 132, 132, 134 → 5 carrier rows

Cross-beam subdivision: for 132 → 44, 44, 44; for 134 → 44, 44, 46 (all ≤ 60).

Total carriers: 25 (5 × 5)