Free · Walls & finishes
Drywall Area & Panel Quantity Calculator
Estimate wall and ceiling coverage, subtract openings and calculate panel quantities.
- Formula & worked example
- Private in your browser
- No signup
Your calculation
- Total area under sloped walls
- 0 m²
- Total doors area
- 0 m²
- Total windows area
- 0 m²
Use one currency for your figures. Mixed-currency conversions use rates captured October 5, 2026, rather than live exchange rates.
How to use this calculator
- Enter the values you know in the units shown. Leave unknown values blank.
- Results update automatically as you type. Edit a result to calculate another value, or lock a value to keep it fixed.
- Reset restores the starting fields. A worked example appears below.
Private by default
Inputs and results stay in this browser tab. Bookify does not upload or store the values you enter.
Formula and method
Subtract openings from the selected wall and ceiling areas before dividing by panel area. A rounded sheet count is an area estimate; the cutting layout can require extra sheets.
Net area = wall area + selected ceiling area + sloping-wall area − doors − windows; panels = ceiling(net area ÷ panel area).
Worked example
Enter these known values and leave the other values blank.
- Room length
- 5 m
- Room width
- 4 m
- Room height
- 2.5 m
- Number of triangular spaces
- 0
- Base of triangular space
- 0 m
- Height of triangular space
- 0 m
- Include ceiling?
- Yes
- Number of doors
- 0
- Door height
- 200 cm
- Door width
- 90 cm
- Number of windows
- 0
- Windows height
- 120 cm
- Windows width
- 90 cm
- Select drywall panel size
- 1200 × 2000 mm
- Total area under sloped walls
- 0 m²
- Gross room area
- 65 m²
- Total doors area
- 0 m²
- Total windows area
- 0 m²
- Net room area
- 65 m²
- Number of panels
- 28
Assumptions and limitations
- Inputs must satisfy the validation rules. Editing a result can recalculate an earlier input; lock values you want to keep fixed.
- Currency conversions use the captured source rates from October 5, 2026; they are not live exchange rates.
Common questions
What does this drywall calculation tell me?
Subtract openings from the selected wall and ceiling areas before dividing by panel area. A rounded sheet count is an area estimate; the cutting layout can require extra sheets.
Can I calculate a different unknown?
Yes. Clear that field and enter the other known values. The calculator uses the available inverse equations.
References
The calculation equations, inverse formulas, units, and input rules were imported from this source. Bookify provides the interface and equation solver.
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