How this calculator works
One 80 lb bag of stucco mix covers about 35 sq ft at 3/8 inch thick (one-coat application) or 25 sq ft for a traditional three-coat system. A 10% waste factor covers corners and edges.
Worked example — a 60 ft × 9 ft wall, one-coat application:
540 sq ft × 1.10 ÷ 35 = 17 bags.
540 sq ft × 1.10 ÷ 35 = 17 bags.
One-coat vs. three-coat
One-coat stucco is a factory-blended mix applied in a single 3/8-inch layer — faster and good for re-stucco work. Traditional three-coat (scratch, brown, finish) is thicker and more durable, and is standard for new construction.
Frequently asked questions
How much does a bag of stucco cover?
An 80 lb bag covers roughly 35 sq ft at 3/8 inch for a one-coat application, or about 25 sq ft for a thicker three-coat system.
How many bags of stucco do I need for a house?
A typical 1,500 sq ft house exterior (minus openings) might need 45–60 bags for one-coat stucco, depending on wall height and window count.