BCBuildCalc
BuildCalc Project Guide

Plasterboard & Drywall Quantity Guide

Estimate sheets, joint compound and related materials for walls and ceilings, with regional sheet-size guidance

In this guide
  1. Measure surfaces, not floor area
  2. Choose sheet size and orientation
  3. Screws and fixings
  4. Tape and joint compound
  5. Worked example
  6. Plasterboard vs drywall

Measure surfaces, not floor area

For walls, calculate wall length × wall height for each wall and deduct openings when appropriate. Add ceiling area separately. Floor area alone does not tell you how much board is required.

Choose sheet size and orientation

Sheet count based purely on total area is a minimum. Orientation, framing layout, ceiling installation and openings affect how efficiently sheets can be used.

minimum sheets = total board area ÷ sheet area

Screws and fixings

Fixing quantity depends on framing spacing, board thickness, number of layers and the installation specification. Follow the board-system manufacturer's fixing pattern rather than relying only on an area rate.

Tape and joint compound

Jointing materials are driven by joint length, corner treatment, number of coats and product coverage. Premixed and setting compounds may have different practical yields.

Worked example

Example: calculate the four wall areas and ceiling separately; deduct large openings; divide by selected sheet area; round up; then add a project-appropriate waste allowance. Check whether offcuts from one surface can be reused on another.

Plasterboard vs drywall

BuildCalc supports the United Kingdom, United States, Canada, Australia, New Zealand, Ireland and South Africa. The geometry is universal, but terminology, units, pack sizes and common product dimensions differ. Use the dimensions printed on the product you intend to buy rather than assuming a regional default is exact.

The terminology changes by market, but the ordering principle is the same. Enter the actual sheet dimensions available from your supplier and check fire, moisture, acoustic and structural performance requirements separately.

Use the related calculators

Use the calculator for your measurements, then return to this guide to check assumptions, allowances and ordering considerations.

Plasterboard / drywallJoint compoundStud wall
Important: BuildCalc provides indicative quantity estimates, not structural, regulatory or professional design advice. Check manufacturer data, site conditions and applicable local requirements before ordering or construction.