Drywall estimator

For one layer on the four inside walls of a rectangular room: wall area = 2 × (length + width) × height. Include the ceiling to add length × width. Deduct the total openings in the selected surfaces; an empty deduction field is not accepted. A deduction equal to the gross area gives zero; a larger one is an error. This is not a two-sided partition or a multi-layer calculation.

Order area = net area × (1 + reserve/100). Board count is order area divided by (board width × length), rounded up. Presets use the displayed metric dimensions, not exact conversions from feet; custom dimensions accept any valid rectangular board. Only tiny floating-point deviations near whole counts are corrected. The result is an area estimate: orientation, offcuts, separate walls, joints and feasible cuts are not arranged, so the actual board count may be higher.

Accessories are optional. Screws = order area × your screws per m², rounded up; compound = order area × your kg/m². Both include the same reserve. The defaults 30 and 0.5 are editable examples, not a system specification. Joint treatment depends on the product, edges and layers; Knauf Uniflott lists different consumption rates for different assemblies. Use rates for the whole selected assembly, not an unrelated product. Joint tape and corner lengths cannot be derived from area alone and are not guessed.

Decimal point or comma is accepted. Dimensions: 0.000001–1,000,000 m; opening deduction: 0–10¹² m²; reserve: 0–100%; accessory rates: 0–1,000,000 per displayed unit. These are software limits. Non-finite or unsafe integer quantities are rejected; very small positive areas are shown scientifically. Calculate or Enter runs; edits clear results. Reset restores examples and closes accessories. No input storage. No framing, structural, fire or acoustic system design.