Stucco Calculator
Stucco Bags Needed by Wall Area
80 lb bags for complete 3-coat application with 10% waste factor.
| Wall Area (sq ft) | Scratch Bags | Brown Bags | Finish Bags | Total Bags |
|---|---|---|---|---|
| 200 | 3 | 3 | 1 | 7 |
| 500 | 6 | 6 | 2 | 14 |
| 1,000 | 11 | 11 | 4 | 26 |
| 1,500 | 17 | 17 | 6 | 40 |
| 2,000 | 22 | 22 | 8 | 52 |
| 3,000 | 33 | 33 | 11 | 77 |
| 5,000 | 55 | 55 | 19 | 129 |
How We Calculate This
This stucco calculator uses established formulas and industry-standard data to provide accurate estimates.
- Enter your specific values into the calculator fields above
- Our algorithm applies the relevant formulas using your inputs
- Results are calculated instantly in your browser — nothing is sent to a server
- Review the detailed breakdown to understand how each factor affects your result
These calculations are estimates based on standard formulas. For critical decisions, always consult a qualified professional.
How to Convert Oven Recipes to Air Fryer
Traditional three-coat stucco uses a scratch coat, brown coat, and finish coat, each applied at a specific thickness. The total thickness is about 7/8 inch over metal lath.
The basic rule:
- Scratch coat (3/8"): approximately 100 sq ft per 80 lb bag of base-coat stucco mix
- Brown coat (3/8"): same coverage as scratch coat — about 100 sq ft per bag
- Finish coat (1/8"): thinner application — about 300 sq ft per 80 lb bag of finish mix
This calculator uses standard coverage rates for pre-mixed stucco. Actual usage varies based on wall texture, application thickness, and whether you are using traditional portland cement stucco or synthetic (EIFS). Always buy 10% extra for waste.
When Would You Use This Calculator?
This stucco calculator is designed for anyone who needs quick, reliable estimates without complex spreadsheets or professional consultations.
- When you need a quick estimate before committing to a purchase or project
- When comparing different options or scenarios side by side
- When planning a budget and need to understand potential costs
- When you want to verify a quote or estimate you've received from a professional
- When teaching or learning about the concepts behind these calculations
Frequently Asked Questions
How many bags of stucco do I need per 100 square feet?
For a complete 3-coat application: about 1 bag of scratch coat, 1 bag of brown coat, and 0.33 bags of finish coat per 100 square feet. That is roughly 2.3 bags total per 100 sq ft. Each bag weighs 80 lbs.
How thick should stucco be?
Traditional three-coat stucco is 7/8 inch total: 3/8 inch scratch coat, 3/8 inch brown coat, and 1/8 inch finish coat. One-coat stucco systems are 3/8 to 1/2 inch thick. The scratch coat must be applied thick enough to fully embed the metal lath.
What is the difference between one-coat and three-coat stucco?
Three-coat stucco is the traditional method using separate scratch, brown, and finish coats over metal lath, totaling 7/8 inch. One-coat stucco uses a single fiber-reinforced base coat (3/8-1/2 inch) plus a finish coat, applied over foam board or directly to sheathing. Three-coat is more durable but one-coat is faster and cheaper.
Do I need metal lath for stucco?
Yes, traditional stucco requires metal lath (expanded metal or woven wire) nailed to the wall sheathing. The lath provides a surface for the scratch coat to grip. You need approximately 1.1 square yards of lath per 10 square feet of wall, accounting for overlaps.
How long does stucco last?
Properly applied traditional stucco lasts 50-80 years or more. Synthetic stucco (EIFS) typically lasts 20-30 years. Maintenance includes filling cracks promptly, repainting every 5-7 years, and ensuring that flashing and weep screeds are functioning properly.
How much does stucco cost per square foot installed?
Professional stucco installation costs $6-$9 per square foot for traditional three-coat, and $4-$7 per square foot for one-coat or synthetic (EIFS). This includes materials, labor, and lath. Material cost alone is typically $0.80-$1.50 per square foot.