SettingsSettings for this calculationUS
The standard allowance most suppliers and estimating guides assume for ordinary work.
The wall area being boarded — the face area of the plasterboard, not the room's floor.
Measure the walls receiving board and subtract openings you will not board over. Reveals and window boards are boarded separately and are usually too small to change the bag count.
How much adhesive the background takes, by mass, for each unit of board area.
This is the figure that moves the answer, and it is a property of the WALL rather than of the board. Flat, true blockwork takes around 3 kg per square metre (0.61 lb per square foot); an older, bowed or previously rendered wall can take twice that, because the same dab pattern has to be thicker to bring every board to one plane. If you have dot-and-dabbed the wall's neighbours, use what they actually took.
Extra for material that goes off in the bucket before it reaches the wall.
Dot-and-dab adhesive is mixed in batches and has a working life of well under an hour. What stiffens in the bucket between boards is the real loss on this material, and it grows with the number of small, interrupted mixes rather than with the area.
Adhesive needed
274 lb
The coverage rate is a property of the background, not of the product, and it is the input that decides the answer. A flat blockwork wall and a bowed rendered one can differ by a factor of two for the same board area.
- Coverage rate used
- 0.78 lb/sq ft
- Board area fixed
- 320 sq ft
- 50 lb bags
- 6 bags
They open the calculator with your figures already in it
Dot-and-Dab (Direct Bond) Drywall Adhesive Calculator: 274 lb — shown in imperial, US market. The link sets both, so the result they see is the one on your screen.
Show calculation logicHide calculation logic
How this was calculated
Formula source(s)
- Adhesive mass = board area × the background's coverage rate (kg per m²); bags = mass ÷ bag mass, rounded up to whole bags
- Dab pattern per board face: three vertical bands of dabs to a 1200 mm wide board, with a continuous band at floor and ceiling level
Inputs used
- Board Area to Fix
- 320 sq ft
- Adhesive Coverage Rate
- 0.78 lb/ft²
- Waste Allowance
- 10
Intermediate steps
- Coverage rate used
- 0.78 lb/sq ft
- Board area fixed
- 320 sq ft
- 50 lb bags
- 6 bags
Confidence note: The coverage rate is a property of the background, not of the product, and it is the input that decides the answer. A flat blockwork wall and a bowed rendered one can differ by a factor of two for the same board area.
What this calculation does not cover
- This counts adhesive and nothing that holds the board while it grabs. A dot-and-dab wall is plumbed and levelled board by board against a straightedge, and heavy boards, tall walls and any deep ceiling drop need temporary support or mechanical fixings while the dabs take up. None of that changes the mass returned here, and all of it changes how long the wall takes.
- Dabs are not a fixing for everything that will later hang on the wall. Board on dabs has a cavity behind it, so a radiator, a boiler, a television bracket or a wall-hung basin needs a pattress, a continuous band of adhesive or a fixing carried back to the masonry, decided BEFORE the board goes on. This calculator does not know where those points are, and adding adhesive does not substitute for them.
- A background that is damp, dusty, painted or highly absorbent is not a background this figure applies to. Adhesive grips what it lands on, so on a painted or friable face it grips the coating and the wall later releases in that skin. Those walls need preparation or a different fixing method, and the quantity above assumes the preparation has already been done.
Estimated cost — your price
This site holds no price list for this material — local prices vary too much to publish honestly. Enter your supplier's price and the result is costed with it.
Computed in your browser — nothing you enter is uploaded. Presented in US customary units and US trade terminology. Where a formula follows a published standard, that standard and its edition are cited beside it on this page; where none governs, the page says so. Local amendments override model codes — verify against the code in force where you build.
Sources checked 2026-09-24 · v1.0.0
Regulatory standards & verification citations2
- Adhesive mass = board area × the background's coverage rate (kg per m²); bags = mass ÷ bag mass, rounded up to whole bags
- Dab pattern per board face: three vertical bands of dabs to a 1200 mm wide board, with a continuous band at floor and ceiling level
Cite this page
Your workspace
Most jobs need more than one number. Add the calculators you need next and they open right here, underneath this one — your figures stay on screen and nothing is lost to a page change.