Stucco Calculator

Stucco is a cement-based plaster applied to exterior walls in multiple layers, and the Stucco Calculator tells you exactly how many bags of material to buy before your project starts. Enter your wall length, wall height, and doors & windows area, then select your base coat thickness and finish coat thickness to get the total stucco bags needed. Secondary outputs break down base coat bags, finish coat bags, net wall area, and estimated material cost — with a waste factor built in so you're not caught short.

ft
ft
sq ft

Total area to subtract for doors and windows

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Additional material to account for waste and overage

Results

Total Stucco Bags Needed

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Net Wall Area

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Base Coat Bags

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Finish Coat Bags

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Estimated Material Cost

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Frequently Asked Questions

How much stucco do I need per square foot?

Typically, you need about 1 bag of stucco mix per 25-30 square feet for a 3/8 inch base coat, and 1 bag per 100 square feet for a 1/8 inch finish coat. The exact amount depends on thickness and surface texture.

What is the difference between base coat and finish coat stucco?

Base coat (scratch coat) is the thick foundation layer applied first, typically 3/8 to 3/4 inch thick. Finish coat is the thin decorative top layer, usually 1/16 to 1/4 inch thick, that provides the final color and texture.

How do I calculate stucco for walls with windows and doors?

Calculate the total wall area (length × height), then subtract the area of doors and windows. Add 10-15% waste factor to account for cuts, overage, and surface irregularities.

What waste factor should I use for stucco projects?

A 10-15% waste factor is recommended for most stucco projects. Use 10% for simple walls and 15-20% for complex surfaces with many openings, corners, or decorative elements.

How thick should stucco be applied?

Standard three-coat stucco system uses 3/8 inch scratch coat, 1/8 inch brown coat, and 1/8 inch finish coat for a total thickness of 5/8 inch. Two-coat systems typically use 1/2 to 3/4 inch base coat plus finish coat.

Can I apply stucco directly over existing surfaces?

Stucco can be applied over concrete, masonry, or properly prepared existing stucco. For wood frame construction, you'll need wire mesh or lath as a base. Always ensure proper surface preparation and bonding.

How much does stucco material cost per bag?

Stucco mix typically costs $8-15 per 50-pound bag depending on type and brand. Base coat stucco is usually less expensive than finish coat stucco, which may include color and special texturing agents.

What tools do I need for stucco application?

Essential tools include a hawk and trowel, float, spray bottle for misting, wire brush for texturing, and mixing equipment. You'll also need safety gear like gloves and eye protection.