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Drywall Screw Count Calculator (Field + Perimeter Spacing)

Calculate total drywall screws needed per sheet from separate perimeter and field fastening spacing, then scale to your sheet count.

Drywall is plasterboard in the UK and Australia.

  • Answers as you type
  • Every formula cited
  • Calculated in your browser
SettingsSettings for this calculationUS
Market
Imperial · sales tax
The width of a single drywall sheet.

Standard sheet width is commonly 1.2 m (4 ft).

The height (length) of a single drywall sheet.

Standard sheet lengths are commonly 2.4 m, 2.7 m, or 3.6 m — use your actual sheet size.

The spacing between screws along the sheet's edges.

Perimeter (edge) fastening is typically spaced closer than the field to hold the sheet edges flat — check your project's fastening schedule for the required spacing.

The grid spacing between screws in the field of the sheet, in each direction.

Field fastening is laid out on a grid at intermediate framing members — this spacing is applied in both directions to form the grid.

The total number of sheets being fastened.

Use the total sheet count from your material takeoff for this fastening pattern.

Total screws needed

700 screws

High confidence
Screws per sheet
35
Screw centres round the sheet edge
0.96 ft
Then change the inputs to see how far the answer moves.

Show calculation logic

How this was calculated

Formula source(s)

  • Perimeter screws per sheet = ceil(sheet perimeter ÷ perimeter spacing); field screws per sheet = ceil((sheet width − field spacing) × (sheet height − field spacing) ÷ field spacing grid area), the interior the perimeter row does not already cover; total = (perimeter + field) × sheet count

Inputs used

Sheet Width
4 ft
Sheet Height
8 ft
Perimeter Screw Spacing
11.75 in
Field Screw Spacing (Grid, Each Direction)
16 in
Number of Sheets
20

Intermediate steps

Screws per sheet
35
Screw centres round the sheet edge
0.96 ft
Final result700 screws

What this calculation does not cover

  • A screw can only go where a framing member is. The field figure is an even grid at whatever spacing you type, but the real field rows fall on the studs or joists crossing the sheet — enter a 300 mm (12 in) field grid on framing at 600 mm (24 in) centres and half the screws in the answer have nothing behind them. The spacing ALONG each member is yours to choose; the spacing ACROSS them was fixed by the framer.
  • The perimeter row assumes a fastener can sit wherever the arithmetic puts it. Screws have to stand off the cut edge of a board — about 10 mm (0.39 in) is the usual minimum — because closer than that the core crumbles and the head pulls through. A sheet whose edge lands part way onto a narrow furring channel, or onto a stud that has twisted, loses fasteners the count still books as placed.
  • Where the wall is rated or braced, neither spacing is a preference. A fire-rated partition and a gypsum-sheathed shear wall each carry a fastening schedule from the tested assembly, and running a comfortable 300 mm (12 in) perimeter spacing where that schedule calls for 100 mm (4 in) at the panel edges gives a total that is arithmetically correct and will not pass inspection.

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.

11.75 in4 ft6 at 11.75 in
Schematic, drawn to the proportions you entered — not to scale on screen.

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 2026-09-06 · in the site-wide review of 2026-09-06 · v1.0.1

Regulatory standards & verification citations1
  1. Perimeter screws per sheet = ceil(sheet perimeter ÷ perimeter spacing); field screws per sheet = ceil((sheet width − field spacing) × (sheet height − field spacing) ÷ field spacing grid area), the interior the perimeter row does not already cover; total = (perimeter + field) × sheet count
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.

Tools and safety for this job

To hang plasterboard and cut board around openings and boxes. Generic types, no brands, no prices.

Protection this work requires

  • Joint-compound dust is very fine and travels: a P1/FFP1 mask is the minimum, and a damp-sponge finish avoids most of it.
  • Boards, blocks and bagged material cause most lasting back injuries on small sites: two people or a lifter for full sheets, and never a bag on one shoulder up a ladder.
  • Knives cause more site injuries than any power tool: cut away from your body, change blades often, and wear cut-resistant gloves to EN 388 level C for repeated cutting.
Show the 9 tools this job needs

Essential

  • Cordless drill/driver

  • Drywall saw

  • Tape measure

  • Utility knife

Recommended

  • Board lifter

  • Combination or framing square

  • Drywall screw gun

Optional

  • Oscillating multi-tool

  • Panel lift

Also needed as materials: drill and driver bits, oscillating blades, replacement blades.

what each drywall tool is for, and the spec that decides which to buy where one does.

Now that you have the number

These guides cover the work this quantity is for — the first ones run this calculator inside the section that raises the question.

  • Dry-Lining a Solid Walluses this calculator

    Dabs or a furring grid on a solid masonry wall: what the substrate decides, and why each route hands the estimator a different thing to count.

  • Hanging Drywalluses this calculator

    Hanging drywall as a chain of decisions — board direction, joint placement, fastener depth — and what each one costs the finisher later.

  • Overboarding or Taking Down a Lath and Plaster Ceilinguses this calculator

    Two answers to a bowing Victorian ceiling — board over it or take it out — and the screw length, dust and container size that decide which.

Still deciding? Drywall Screws vs Adhesive — the factors that actually differ, with no invented prices.

Worked examples: Basement room drywall — step 5 of 10 · Stud partition with a door — step 3 of 10

Already gone wrong? Small round bumps or cracks are appearing over my screws and nails

How to calculate drywall screw count (field + perimeter spacing) in 6 steps

  1. Sheet WidthThe width of a single drywall sheet.
  2. Sheet HeightThe height (length) of a single drywall sheet.
  3. Perimeter Screw SpacingThe spacing between screws along the sheet's edges.
  4. Field Screw Spacing (Grid, Each Direction)The grid spacing between screws in the field of the sheet, in each direction.
  5. Number of SheetsThe total number of sheets being fastened.
  6. Total screws neededThe tool computes the total screws needed from those figures and shows the formula, its sources, and a confidence rating alongside it.

Total screws needed by sheet width

Page defaults, not your figures above.

Sheet WidthTotal screws needed (screws)
2 ft480
2.5 ft540
3 ft600
3.5 ft660
4 ft720
4.5 ft780

Frequently asked questions

Why are perimeter and field spacing calculated separately?
Perimeter (edge) screws and field screws are often specified at different spacings — the edges typically need closer fastening to hold the sheet flat, while the field is fastened on a wider grid at intermediate framing.
What spacing values should I enter?
Use the perimeter and field fastening spacing required by your project specification, drywall manufacturer, or local code — this calculator applies whatever spacing you enter rather than assuming a fixed value.
Does this calculation account for openings or cut sheets?
No — this estimates screws for full, uncut sheets at the given spacing. Sheets cut down for openings or offsets will need fewer field screws than a full sheet, so adjust your sheet count or totals accordingly.
Preliminary estimate, not certified engineering. This tool produces an indicative quantity calculation for planning purposes only — it is not a certified structural analysis, a guaranteed material takeoff, or a substitute for building department approval. Always verify measurements on-site and have a licensed contractor or structural engineer review any load-bearing, code-sensitive, or safety-critical work before purchasing materials or starting construction. Spotted an arithmetic or standards error? Report it to contact@craftquantities.com with your inputs — a confirmed fix gets a permanent check of its own, so the same mistake cannot come back.