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Stucco Calculator – 3-Coat System 22 mm

Quick answer

Stucco calculator sizes the classic 3-coat system: 9.5 mm scratch, 9.5 mm brown, 3 mm finish - about 0.022 m³ and 12 kg cement per m².

Figures are estimates from this calculator’s standard formula — adjust the inputs in the tool below for your exact number.

How the stucco calculator works

Stucco Volume = Area × 0.022 m (scratch 9.5 + brown 9.5 + finish 3 mm)

Instead of working from a supplier's ballpark figure, this calculator derives your stucco requirement from Stucco Volume = Area × 0.022 m (scratch 9.5 + brown 9.5 + finish 3 mm) using the exact wall area and coat schedule you provide. The arithmetic stays transparent: each result links back to the displayed formula, so you can audit any number. For instance: A 60 m² facade takes 1.32 m³ of stucco - roughly 16 bags of cement and 1.5 m³ of sand. Keep in mind: Cure each coat slowly - 48 h misting prevents map cracking. Quantities are rounded conservatively so offcuts, spillage and delivery shortages never stop work mid-job.

  1. 1

    Measure the space

    Record the wall area and coat schedule at the widest and longest points.

  2. 2

    Enter the values

    Type the measurements into the calculator and select your units.

  3. 3

    Apply the formula

    The tool computes Stucco Volume = Area × 0.022 m (scratch 9.5 + brown 9.5 + finish 3 mm) for your inputs instantly.

  4. 4

    Add waste and order

    Review the total with a 5-10% margin and round up to whole units.

Use Cases

Boundary and garden walls

Count stucco units and mortar for freestanding walls.

House wall construction

Take off stucco quantities room by room from plans.

Renovation extensions

Match existing coursing when blending new stucco into old walls.

Common Mistakes

  • Wrong unit count per area

  • Mortar joints of uneven width

  • Dry absorbing units

FAQs

How thick is a 3-coat stucco system?

22 mm total - 9.5 mm scratch, 9.5 mm brown and 3 mm finish over wire lath.

How long between stucco coats?

Scratch to brown: 7-28 days traditional, or 48 h minimum; finish coat after the brown has cured 7 days.

How much cement per m² of stucco?

About 12 kg per m² for the full 22 mm system - roughly one 50 kg bag per 4 m².

How long does stucco need to cure before painting?

28 days for the finish coat - painting earlier traps moisture and causes peeling.