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Stucco Calculator

Estimate the bags of stucco mix needed to cover exterior walls.

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 2026-08-25 · v1.0.0

Market
Imperial · sales tax
131 ft9.84 ft
Schematic, drawn to the proportions you entered — not to scale on screen.

Estimated stucco needed

12 bags

Check your inputs

Stucco coverage varies by product and number of coats (scratch, brown, finish) — this estimates a single finish-coat pass using a common average; check your specific product for multi-coat systems.

Net wall area
1129.13 sq ft

At the values currently entered, the result works out to 12 bags. 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

  • An 80 lb bag of stucco mix commonly covers approximately 100 sq ft at standard application thickness — always confirm against your specific product's coverage chart

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.

Frequently asked questions

Does this account for multiple coats?
This estimates a single finish coat. Traditional 3-coat stucco systems (scratch, brown, finish) need separate calculations per coat, each with its own coverage rate.
Does it matter what's underneath the stucco?
Yes for prep work (lath, weather barrier) but not for this bag-count estimate, which is based purely on visible wall area.
Can stucco be applied over any wall surface?
No — proper substrate preparation (weather-resistant barrier and lath, or a compatible masonry surface) is required. This calculator estimates material quantity only, not substrate suitability.