SurfaceCalculator — Automatic surface-based billing

<p><strong>SurfaceCalculator</strong> streamlines sales of wallpaper, panels, flooring, fabric, glazing, printing and any product or service billed by square metre.</p><p>Dolibarr line entry remains native by default. When <strong>Surface</strong> is enabled, the module displays dimensions, calculates unit and total surface, and transfers the configured value to the Dolibarr quantity. Values are stored on the line.</p><h3>Features</h3><ul><li>Customer proposals, orders and invoices.</li><li>“Bill by surface” option on product and service cards.</li><li>Automatic activation when a configured item is selected.</li><li>Width, height and item count.</li><li>Global unit: mm, cm or m.</li><li>Length and surface rounding.</li><li>Dolibarr quantity can contain total surface or item count.</li><li>Native behaviour preserved for unrelated lines.</li><li>PDF: dimensions and total surface in the designation only.</li><li>French and English interface.</li><li>No Dolibarr core modification and no external service.</li></ul><h3>Verified compatibility</h3><p>Dolibarr 17.0.4, 22.0.4 and 23.0.3. Minimum version: 17.</p><h3>Installation</h3><ol><li>Deploy the ZIP from Home &gt; Setup &gt; Modules/Applications.</li><li>Enable SurfaceCalculator.</li><li>Select the unit and quantity mode.</li><li>Enable “Bill by surface” on relevant items.</li></ol><p>GNU GPL v3 or later. Updates available for 2 years.</p>