3-Coat Stucco (7/8" Scratch, Brown & Finish Coat) Cement Bags & Sand Yardage Calculator

Compute cement bags, plaster sand tons, and metal lath rolls for 3-coat or 1-coat stucco.

94-lb Stucco Cement Bags Required
41 bags (94 lb)
Plaster Sand Tonnage Required 7.09 tons
Wet Plaster Volume (With 8% Waste) 141.75 cu ft
Metal Lath Sheets (27"×96" = 18 sqft) 111 sheets
Inputs
⚡ Scenarios:
sq ft
Net exterior wall area to stucco in square feet.
inches
Combined stucco thickness in inches (0.875" for 7/8" 3-coat; 0.50" for 1-coat).
ratio
Volumetric plaster sand-to-cement ratio (typically 3.0 to 4.0 parts sand : 1 cement).
Results & Graph
94-lb Stucco Cement Bags Required
41 bags (94 lb)
Plaster Sand Tonnage Required
7.09 tons
Wet Plaster Volume (With 8% Waste)
141.75 cu ft
Metal Lath Sheets (27"×96" = 18 sqft)
111 sheets

94-lb Stucco Cement Bags Required

Graph 1 • 3-Coat Stucco Material • Domain Architecture & Live Telemetry Maps Net Wall Surface Sq Ft, Total Stucco Thickness Inches, Sand To Cement Ratio through 3-Coat Stucco Material Formula.
INPUT PARAMETERS • Net Wall Surface S: 1800 sq ft • Total Stucco Thick: 0.875 inches • Sand To Cement Rat: 3.5 ratio ∑ F(x) 3-Coat Stucco Material DESIGN OUTPUT 41 bags (94 lb) Plaster Sand Tonnage Req: 7.09 tons Wet Plaster Volume (With: 141.75 cu ft
Graph 2 • 94-lb Stucco Cement Bags Required Across Net Wall Surface Sq Ft Sweep (40% → 160%) Evaluates StuccoVol_ft³ = NetWallSqFt × (TotalThickness_in / 12) × 1.08; CementB across 7 operating points (current input highlighted).
0 bags ( 35.75 bags ( 71.50 bags ( 17 720sq ft 25 1.1ksq ft 33 1.4ksq ft 41 1.8ksq ft 49 2.2ksq ft 57 2.5ksq ft 65 2.9ksq ft
Graph 3 • Joint Sensitivity: Net Wall Surface Sq Ft × Total Stucco Thickness Inches Compares 94-lb Stucco Cement Bags Required when Total Stucco Thickness Inches is shifted +25% (solid) vs. −25% (dashed).
0 bags ( 36.30 bags ( 72.60 bags ( --- Total Stucco Thickness Inches @ 75% 36 -30% 44 -15% 51 +0% 59 +15% 66 +30%
Summary: Covering 1,800 sq ft at 0.875" thickness (141.8 cu ft wet plaster) requires 41 bags of 94-lb cement and 7.09 tons of plaster sand.
Summary: Covering 1,800 sq ft at 0.875" thickness (141.8 cu ft wet plaster) requires 41 bags of 94-lb cement and 7.09 tons of plaster sand.
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Formula & Mathematical Methodology: 3-Coat Stucco Material Formula

StuccoVolft³ = NetWallSqFt × (TotalThicknessin / 12) × 1.08
CementBags ≈ StuccoVolft³ / 3.5
StuccoVol_ft³ = NetWallSqFt × (TotalThickness_in / 12) × 1.08; CementBags ≈ StuccoVol_ft³ / 3.5
  • netWallSurfaceSqFt: Net Wall Surface Sq Ft (sq ft)
  • totalStuccoThicknessInches: Total Stucco Thickness Inches (inches)
  • sandToCementRatio: Sand To Cement Ratio (ratio)

Rounding: Engineering outputs round to 2–3 decimal places; discrete material bag/unit counts round up via ceiling.

Worked Example: Engineering Scenario: 3-Coat Stucco Material

Compute cement bags, plaster sand tons, and metal lath rolls for 3-coat or 1-coat stucco.

  1. Enter your system dimensions, electrical/RF ratings, or environmental conditions.
  2. Evaluate the governing equation: StuccoVol_ft³ = NetWallSqFt × (TotalThickness_in / 12) × 1.08; CementBags ≈ StuccoVol_ft³ / 3.5.
  3. Inspect the primary design output, supporting allowances, and 3 SVG schematics.
Result: Computes 3-Coat Stucco Material via StuccoVol_ft³ = NetWallSqFt × (TotalThickness_in / 12) × 1.08; CementBags ≈ StuccoVol_ft³ / 3.5.

Frequently Asked Questions

How does the 3-Coat Stucco (7/8" Scratch, Brown & Finish Coat) Cement Bags & Sand Yardage Calculator calculate results?

It evaluates StuccoVol_ft³ = NetWallSqFt × (TotalThickness_in / 12) × 1.08; CementBags ≈ StuccoVol_ft³ / 3.5 directly in your browser and updates three custom SVG visualizations in real time.

Can I use Goal Seek to solve backwards for a required dimension or rating?

Yes. Click "🎯 Goal Seek" in the results toolbar to solve backwards for any numeric input parameter.

Does this engineering calculator work offline?

Yes. All calculations run 100% locally in your browser and work offline via the CalculatorGraph PWA.

Construction & Home · Concrete, Masonry & Sitework

3-Coat Stucco (7/8" Scratch, Brown & Finish Coat) Cement Bags & Sand Yardage Calculator: inputs, method, and how to read the result

Compute cement bags, plaster sand tons, and metal lath rolls for 3-coat or 1-coat stucco.

Choose inputs for the case you are checking

The defaults are illustrative. Replace them with values for your case and keep the units shown beside each field.

  • Net Wall Surface Sq Ft: Net exterior wall area to stucco in square feet.
  • Total Stucco Thickness Inches: Combined stucco thickness in inches (0.875" for 7/8" 3-coat; 0.50" for 1-coat).
  • Sand To Cement Ratio: Volumetric plaster sand-to-cement ratio (typically 3.0 to 4.0 parts sand : 1 cement).

What the calculation includes

With the default values shown, 94-lb Stucco Cement Bags Required is 41 bags (94 lb). The calculation follows 3-Coat Stucco Material Formula; the formula and variable definitions above show how the inputs combine.

One-input check: With the other defaults held constant, changing Net Wall Surface Sq Ft from 1,800 sq ft to 1,980 sq ft changes 94-lb Stucco Cement Bags Required from 41 bags (94 lb) to 45 bags (94 lb). This is a comparison inside the calculator's stated model, not a prediction.

Where to use caution

  • Uses standard NREL, IEEE, ASHRAE, and IRC design equations.
  • Verify final structural, electrical, and mechanical specifications against local building codes.

Scope: Global Engineering & Building Code Standard Check the assumptions and limitations against your situation before relying on the estimate.

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