Dry mixes
Plaster, putty, screed, tile adhesive, primer.
Bags needed (25 kg each)
16bags
360 kg + 10% reserve = 396 kg
Buy: 400 kg · leftover ≈ 4 kg
How the figure is calculated20 m² × 15 mm × 1.2 kg/m²/mm = 360 kg (Gypsum plaster), + 10% = 396 kg ÷ 25 kg = 16 bags.
Gypsum sets in about 30 minutes — mix in batches you can use up in time.
Sources and methodology
- Usage kg/m²/mm — by mix type
- Standard 25 kg bag
Formula version 1.0 · Norms checked 08.2026
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MaterialQty
Gypsum plaster bags16
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Material estimate
Calculator: Dry mixes · Date: · Materia
Input data
- What to calculate: Gypsum plaster
- Room area: 20 m²
- Subtract openings: 0 m²
- Layer thickness: 15 mm
- Bag weight: 25 kg
- Reserve: 10 %
Materials to buy
| Item | Quantity | Unit | Note |
|---|---|---|---|
| Gypsum plaster | 16 | bags | including 10% reserve |
Calculation
20 m² × 15 mm × 1.2 kg/m²/mm = 360 kg (Gypsum plaster), + 10% = 396 kg ÷ 25 kg = 16 bags.
The calculation is approximate. Verify consumption against the specific material manufacturer instructions.