Drywall Calculator

Drywall estimating is really joint estimating. The sheet count is easy arithmetic; what actually determines how long the job takes is how many butt joints you create by hanging short pieces. A room hung in long sheets with staggered seams will tape in half the time of one pieced together from offcuts.

The 10% waste allowance here is the standard for a straightforward room. It is not enough for a room with a vaulted ceiling, multiple soffits or several closets — in those cases, draw the sheet layout before ordering.

How this calculator works

Every field is editable and the result updates as you type — nothing is submitted anywhere, all the maths runs in your browser. That matters for a number you are about to spend money on: you can see exactly which input moved the answer, and by how much.

What this calculation assumes

Assumes 4x8 sheets, 16 inch stud spacing and a level-three finish. Rooms with vaulted ceilings, soffits, bulkheads or many closets need a sheet layout drawn out before ordering, because butt joints cost more time than board.

Treat the result as an order-of-magnitude check rather than a final quantity. Product packaging changes, regional labour rates vary by a factor of two, and no calculator has seen your actual site.