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Multi-Layer Fire-Rated (Type X) Gypsum Sheet Calculator

Calculate total Type X gypsum board sheets needed for a multi-layer, both-sides fire-rated wall assembly.

  • Answers as you type
  • Every formula cited
  • Calculated in your browser
SettingsSettings for this calculationUS
Market
Imperial · sales tax
The area of one face of the wall being sheeted.

Enter the area of a single side of the wall — the calculator applies the layer count and doubles for both sides automatically.

The coverage area of a single Type X gypsum board sheet.

A standard 1.2 m × 2.4 m sheet covers 2.88 m². Adjust this if your sheet size differs.

The number of Type X gypsum board layers required on each side of the wall.

Take this number directly from the tested UL or GA fire-rated assembly design for your specific wall construction — do not assume a layer count.

Total Type X sheets needed

14 sheets

Medium confidence

The number of layers required for a specific fire-resistance rating must be taken from a tested UL or GA fire-rated assembly design for your exact wall construction — never assume a layer count without checking the tested assembly.

Sheets per side (one layer)
7
Then change the inputs to see how far the answer moves.

Show calculation logic

How this was calculated

Formula source(s)

  • Sheets per side = ceil(wall area ÷ sheet area); total sheets = sheets per side × layers per side × 2 sides. The exact number of Type X layers required for a specific fire-resistance rating (1-hr, 2-hr, etc.) must come from a tested UL or GA fire-rated assembly design, not a general formula

Inputs used

Wall Area (One Side)
220 sq ft
Sheet Area
32 sq ft
Layers per Side
1

Intermediate steps

Sheets per side (one layer)
7
Final result14 sheets

Confidence note: The number of layers required for a specific fire-resistance rating must be taken from a tested UL or GA fire-rated assembly design for your exact wall construction — never assume a layer count without checking the tested assembly.

What this calculation does not cover

  • Divides area by sheet area with no waste at all, which never happens on a rated wall. Multi-layer designs require the face-layer joints offset from the base layer, so the face layer starts on a cut sheet in every run and the remainder is usually too narrow to reuse. A takeoff without an allowance on top of this comes up short.
  • Wall area means the full height of the rated wall, up to the underside of the structure above. Measuring to a suspended ceiling is the classic way a rated partition ends up with an unrated gap over the tiles, and it drags the sheet count down with it.
  • The board is the cheap half of the assembly. The tested design also fixes stud gauge and spacing, screw type, length and spacing — which changes between base and face layer — joint treatment, and the head-of-wall detail with its deflection allowance and listed firestop. Every one of those is inspected, and none of them is a sheet count.

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.

14.83 ft4.52 m14.83 ft4.52 mequivalent area220 sq ft20.44 m²5 ft2 m

Part of a bigger job

This trade is one line of a job takeoff. Run the whole job and every other trade comes back with it, off the same measurements.

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. Sheets per side = ceil(wall area ÷ sheet area); total sheets = sheets per side × layers per side × 2 sides. The exact number of Type X layers required for a specific fire-resistance rating (1-hr, 2-hr, etc.) must come from a tested UL or GA fire-rated assembly design, not a general formula
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.

  • Fire Doors and the Escape Route for a Loft Conversionuses this calculator

    Adding a third storey turns the stairwell into the only way out, and the enclosure that protects it runs from the new landing down to the front door.

  • Firestopping Penetrationsuses this calculator

    Every penetration is a defeat of an assembly that was tested whole — how to name what was breached and install the listed system that puts it back.

  • 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.

Called something else where you work? Fire door — the term in each market, how close the equivalence really is, and the standard that governs it.

Already have some? How long a fire-rated wall will my Type X sheets board?

How to calculate multi-layer fire-rated (type X) gypsum sheet in 4 steps

  1. Wall Area (One Side)The area of one face of the wall being sheeted.
  2. Sheet AreaThe coverage area of a single Type X gypsum board sheet.
  3. Layers per SideThe number of Type X gypsum board layers required on each side of the wall.
  4. Total Type X sheets neededThe tool computes the total type X sheets needed from those figures and shows the formula, its sources, and a confidence rating alongside it.

Total Type X sheets needed by wall area (One Side)

Page defaults, not your figures above.

Wall Area (One Side)Total Type X sheets needed (sheets)
100 sq ft8
150 sq ft10
200 sq ft14
250 sq ft18
300 sq ft20
350 sq ft24
400 sq ft26

Frequently asked questions

Where do I find the required number of Type X layers?
The layer count needed for a specific fire-resistance rating (1-hour, 2-hour, etc.) comes from a tested UL or GA fire-rated assembly design that matches your exact wall construction — it is not a general formula and varies by assembly.
Why does this multiply by 2 sides?
A fire-rated wall assembly typically requires the specified layers of Type X board on both faces of the wall, so the total sheet count doubles the per-side quantity.
Can I use this for a single-sided sheeting takeoff?
This calculator assumes both sides of the wall are sheeted identically. For a single-sided takeoff, halve the headline total. Do not stop at the 'Sheets per side (one layer)' breakdown row on its own — as its label says, that row is ONE layer, so on a two-layer assembly it is half of what one side takes and a quarter of the headline. Multiply it by your layers-per-side figure.
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.