SuCalc
Home & Construction

Plaster & Stucco Calculator

Updated Aug 25, 2026 Reviewed Aug 25, 2026
Estimate base and finish plaster volumes, whole bags, optional lath rolls and cost from verified yield at reference thickness.

Plaster and stucco takeoff

Enter surfaces, installed thickness and verified bag yield

1

Area 1

Enter total installed thickness across all base coats.

Material estimate — not wall-system design
Confirm approved coat build-up, substrate, lath, control joints, weather limits, mixing and curing with the selected system.

Result

Calculation summary

Enter values to see the result

Your result, breakdown, assumptions, and warnings will appear here.

Coat-build preview

Substrate, base coats and finish layer

Live preview
Three-coat system — two base coats and finish

Net plaster area

20 m²

Finish bags

3

Total bags

25

How to use this calculator

  1. 1Add surfaces and exclusions.
  2. 2Choose the material and coat arrangement.
  3. 3Enter total base thickness and bag yield.
  4. 4Enter optional finish and lath yields, waste and prices.

Formula

Bags = ceil(area × thickness × waste factor ÷ yield volume)

Yield volume is derived from manufacturer coverage at a reference thickness.

Calculation steps

  • Calculate net area.
  • Convert base and finish thickness to volume.
  • Apply waste.
  • Derive package yield.
  • Round bags and lath rolls upward.

Worked example

An 80 lb stucco base bag may cover about 20–24 ft² at 3/8 in according to product data.

Assumptions

  • Base thickness includes all base coats.
  • Yields come from current data.
  • Areas do not overlap.
  • Lath is a simple area takeoff.
  • Assembly design is outside scope.

Sources

Frequently asked questions

What is combined base thickness?

The installed thickness of all base coats together.

Why are base and finish separate?

Their yields, thicknesses and prices commonly differ.

Can it estimate gypsum or lime plaster?

Yes, with the correct product yield.

Does three-coat mode set thickness?

No, thickness remains explicit.

Does it design reinforcement?

No.

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