Stucco Calculator
Stucco is applied in 2–3 coats over metal lath. A 3-coat system uses a scratch coat (~3/8"), brown coat (~3/8"), and finish coat (~1/8"). One-coat systems apply a single 3/8" coat. Each 80lb bag covers approximately 40–50 sq ft per coat.
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Top PickStucco Base Coat 80lb — Home Depot~$14.98/bag* Affiliate links — we may earn a commission at no cost to you.
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How to Use This Calculator
- 1Enter your measurements in the fields above. Use the units shown next to each field (ft, in, etc.).
- 2Click Calculate to get your material estimate instantly.
- 3Review the highlighted result — it shows the key quantity you need to order.
- 4Use Copy Results to save your estimate, or bookmark the URL — your inputs are encoded in the link.
Pro tip: Always add 10% to your material order to account for waste, cuts, and defects.
Frequently Asked Questions
How many bags of stucco do I need for 400 sq ft?
For a 3-coat stucco system on metal lath: scratch coat = 11 bags, brown coat = 11 bags, finish coat = 7 bags = 29 bags total (80lb each). For one-coat: scratch + finish = 18 bags.
What is the difference between one-coat and three-coat stucco?
Three-coat stucco (scratch, brown, finish) totals 7/8" thick and is the traditional exterior system — very durable and weather-resistant. One-coat stucco applies a single 3/8" reinforced coat and is faster, less expensive, but thinner. Both are code-compliant for residential exteriors.