Classroom Spacing Calculator — Desks per Room

Formula

How this is calculated

The calculator uses a rectangular grid model: each desk occupies a cell of (desk width + aisle gap) in the horizontal direction and (desk depth + aisle gap) in the depth direction. The number of columns is the whole number of cells that fit across the room width, and the number of rows is the whole number that fit along the room length. Multiplying rows by columns gives the maximum desk count for a straight-row layout.

This is a conservative model — it assumes a uniform gap on all sides of every desk, which is simpler to set out in practice and meets most fire-code aisle requirements. In real classrooms the front and side walls can sometimes allow desks to be placed flush with less clearance, gaining an extra row or column; the calculator's result is therefore a reliable minimum you can then fine-tune on site.

Typical minimum aisle widths for occupied rooms range from 0.45 m (secondary circulation) to 0.9 m (primary exit routes). A gap of 0.6 m between desk edges is a common default for classroom rows. The desk-area utilisation figure shows what fraction of the total floor area is actually covered by desk surfaces — values of 15–35% are typical for well-spaced classrooms.