TryBuildCalcPlasterboard Calculator (Sheets, Screws, Tape & Cost)
Estimate drywall sheets, screws, tape, mud, and cost.
🕒 Last updated: October 3, 2026
Inputs
Section 1: Room Dimensions
ℹ️A standard residential ceiling is about 8-9 ft (2.4-2.7 m).
ℹ️Set to more than 1 if several identical rooms share this same size.
ℹ️Only for a garage door or wide sliding door that removes most of one wall's width — standard doors and windows are not deducted.
ℹ️Required whenever a large opening width is set — any wall above the opening (a lintel strip) still needs sheets unless the opening runs full floor-to-ceiling.
Section 2: Sheet Details
ℹ️Width is almost always 4 ft (1220 mm) for US/Canada drywall, or 1200 mm for UK/Australian plasterboard — length varies by how much continuous run you need.
ℹ️Changes only the estimated material weight — sheet count depends on the length and width above, not thickness.
ℹ️Auto checks both directions for every wall/ceiling and keeps whichever needs fewer sheets geometrically — it does not know your joist spacing or direction. Many codes and manufacturer span tables require a specific orientation regardless of sheet count, especially on ceilings; confirm that separately.
ℹ️Use 5-10% for simple rooms and 10-15% for rooms with more cutouts or complex layouts.
ℹ️32 per 4x8 sheet is typical for standard 16 in on-center framing.
Section 3: Cost
Buy at least 16 sheets
Covering 36.00 m² of wall surface (packed hanging vertical).
Sheet Summary
Wall Sheets (before wastage): 14 sheets
Wastage Added: 10%
Final Sheets to Buy: 16 sheets
Screws, Tape, Mud & Weight
Screws: 512 pcs
Joint Tape: 1 roll(s) (250 ft each)
Joint Compound: 1 bucket(s) (4.5 gal each)
Estimated Material Weight: 371 kg
Quick Insight
Each wall was packed into whole sheets independently, then 10% wastage was added on top — that's 2 extra sheet(s) beyond the 14 geometrically required.
Calculated by packing each wall into whole sheets (orientation: auto), then adding 10% wastage.
Approximate results for planning only. Verify with a professional.
Drywall Sheet Layout (One Wall)
Looking for the verification checklist, reference tables, or tips and mistakes?See the complete Drywall Sheet Calculator.
Plasterboard estimate
This page is pre-filled for a 4 m x 3.5 m room with a 2.4 m ceiling using standard 1200 x 2400 mm UK/Australian plasterboard sheets — that packs out to 14 sheets before wastage, 16 with a typical 10% allowance.
Plasterboard, drywall, gypsum board, and Sheetrock all describe the same category of product under different regional names — this page simply defaults to the metric sheet size and currency most UK and Australian users expect; every input is still fully editable.
How the drywall sheet calculation works
Each wall is packed independently into a grid of whole sheets, rather than dividing one combined area by one sheet's area.
Step 1 - Pack each wall into whole sheets
Rows = CEIL(Ceiling Height / Sheet Edge Along Height)
Columns = CEIL(Wall Run / Sheet Edge Along Run)
Sheets for that Wall = Rows x Columns
"Auto" orientation computes this for both hanging directions (long edge up the wall vs. along it) on every wall and keeps whichever needs fewer sheets.
Step 2 - Sum every wall (and the ceiling, if included)
Wall Sheets = 2 x Width-Wall Sheets + Length-Wall Sheets + Opening-Reduced Length-Wall Sheets + Lintel-Strip Sheets
Ceiling Sheets = Rows x Columns, best-fit orientation
Raw Sheets = Wall Sheets + Ceiling Sheets
A large opening (garage door, wide slider) shortens only the one length-wall it sits on, by its own width and height — any wall area above it (a lintel strip) is packed separately and still counted, unless the opening runs full floor-to-ceiling. A standard door or window is not deducted at all.
Step 3 - Add wastage
Final Sheets = CEIL(Raw Sheets x (1 + Wastage / 100))
Wastage is a buffer on top of the already-whole packed count, covering cuts around outlets and breakage — not a substitute for packing each wall.
Step 4 - Derive screws, tape, mud, weight, and cost
Screws = Final Sheets x Screws per Sheet
Joint Tape = CEIL((Panel Seams + Inside Corners + Ceiling Angle) / 76.2 m per roll)
Joint Compound = CEIL(Installed Area / 46.5 m² per bucket)
Material Weight = Final Sheets x Sheet Area x Weight per m²
Total Cost = Sheet Cost + Labor Cost
Joint tape length comes from the interior seams the packing grid implies, plus the room's inside wall corners and (when the ceiling is included) the wall-to-ceiling angle — not a separate flat-rate guess.
Real-World Drywall Sheet Calculation Example
This example uses the active calculator inputs above and follows the same steps from the formula section.
Input Values Used
| Input | Value | Why it is used |
|---|---|---|
| Rooms | 1 room(s) | Determines how many wall grids are packed |
| Sheet Size | 2.44 m x 1.22 m | Sets the grid cell size used for packing |
| Orientation | auto | Decides which edge of the sheet runs up vs. along the wall |
| Wastage | 10% | Adds allowance on top of the packed sheet count |
Step 1 & 2 — Sheet Packing
| Calculation | Formula / Substitution | Result |
|---|---|---|
| Wall sheets | Each wall packed independently x 1 room(s) | 14 sheets |
| Raw sheets (before wastage) | Sum of the above | 14 sheets |
Step 3 — Final Sheets
| Calculation | Formula / Substitution | Result |
|---|---|---|
| Final sheets (incl. wastage) | ROUND UP(14 x (1 + 10/100)) | 16 sheets |
Step 4 — Screws, Tape, Mud & Weight
| Calculation | Formula / Substitution | Result |
|---|---|---|
| Screws | 16 sheets x screws/sheet | 512 pcs |
| Joint tape | 33.6 m seams / 76.2 m roll | 1 roll(s) |
| Joint compound | 36 m² / 46.5 m² bucket | 1 bucket(s) |
| Material weight | 16 sheets x 2.97 m² x weight/m² | 371 kg |
Therefore, for this job you need 16 sheets, about 512 screws, 1 roll(s) of joint tape, and 1 bucket(s) of joint compound.
This page keeps things focused on the calculation above. For the full construction guide — verification checklist, reference tables, usage steps, tips, common mistakes, and limitations.See the complete Drywall Sheet Calculator.
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Disclaimer: This calculator provides approximate results for planning and estimation purposes only. Actual requirements may vary based on site conditions, materials, workmanship, and local building regulations. Always consult a qualified engineer, architect, or construction professional before making final decisions.