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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.

Computed in your browser — nothing you enter is uploaded. Figures are presented for United States against IRC 2024, and every formula is cited under regulatory standards below.

Last verified 2026-08-26 · v1.0.0

Market
Imperial · sales tax

Total Type X sheets needed

14 sheets

Check your inputs

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

At the values currently entered, the total type x sheets needed works out to 14. Note that layers per side sits at the low end of the range this calculator was checked against, so treat the output as indicative rather than settled. Confidence is moderate: the method is sound, but real materials and site conditions vary. Figures are shown for United States, where IRC 2024 is the governing residential reference; switch the market above if you are building elsewhere.

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.

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 — confirmed fixes become pinned regression tests.

[Schema Verified] Computed in alignment with American Concrete Institute (ACI 318-19) formulas and International Residential Code (IRC 2024) spatial boundaries.

Regulatory standards & verification citations

  • 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

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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, use the sheets-per-side breakdown value shown in the result and skip the ×2 side multiplier.