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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 in United States units and terminology, and each formula’s basis is cited under regulatory standards below.

Last verified 2026-08-25 · v1.0.0

Market
Imperial · sales tax
130 ft10 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
1137.46 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 in United States units and terminology; 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 — a confirmed fix gets a permanent check of its own, so the same mistake cannot come back.

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.

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.