TryBuildCalcCeiling Drywall 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 20 sheets
Covering 43.85 m² of wall and ceiling surface (packed hanging vertical).
Sheet Summary
Wall Sheets (before wastage): 12 sheets
Ceiling Sheets (before wastage): 6 sheets
Wastage Added: 10%
Final Sheets to Buy: 20 sheets
Screws, Tape, Mud & Weight
Screws: 640 pcs
Joint Tape: 1 roll(s) (250 ft each)
Joint Compound: 1 bucket(s) (4.5 gal each)
Estimated Material Weight: 464 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 18 geometrically required.
Calculated by packing each wall and the ceiling 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.
Ceiling drywall estimate
This page defaults to Include Ceiling switched on — for a 12 ft x 10 ft room this adds the ceiling's own best-fit sheet grid on top of the four wall totals.
Use this when drywall is screwed directly to ceiling joists rather than hung from a separate suspended grid system.
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) | 12 sheets |
| Ceiling sheets | Best-fit grid x 1 room(s) | 6 sheets |
| Raw sheets (before wastage) | Sum of the above | 18 sheets |
Step 3 — Final Sheets
| Calculation | Formula / Substitution | Result |
|---|---|---|
| Final sheets (incl. wastage) | ROUND UP(18 x (1 + 10/100)) | 20 sheets |
Step 4 — Screws, Tape, Mud & Weight
| Calculation | Formula / Substitution | Result |
|---|---|---|
| Screws | 20 sheets x screws/sheet | 640 pcs |
| Joint tape | 52.4 m seams / 76.2 m roll | 1 roll(s) |
| Joint compound | 43.85 m² / 46.5 m² bucket | 1 bucket(s) |
| Material weight | 20 sheets x 2.97 m² x weight/m² | 464 kg |
Therefore, for this job you need 20 sheets, about 640 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.