Plaster Calculator (cement & sand)
Work out cement bags and sand for wall plaster. Enter area, thickness (12, 15, 20 mm) and mix (1:4 or 1:6).
Quick answer
100 m², 12 mm, 1:6: 7 bags of cement.
How it is calculated
- Wet volume = area × thickness = 100 × 0.012 = 1.2 m³.
- Dry volume = wet × 1.27 (for voids and wastage).
- Split cement and sand by the mix; one cement bag ≈ 0.0347 m³.
Worked example
12 mm plaster in 1:6 on 100 m² of wall needs cement 7 bags and sand 46.1 cft.
| Wall area | 100 m² |
| Thickness | 12 mm |
| Mix | 1:6 |
| Cement bags | 7 bags |
| Sand | 46.1 cft |
Formula
dry = Ar×Th×1.27 Cement bags = ceil(dry/Mx/0.03472) Sand = dry×(Mx-1)/Mx×35.3147
Good to know
- Inside walls usually get 12 mm; outside walls 15–20 mm.
- Ceiling plaster is often 1:4 at 6 mm.
Questions people ask
Cement per m² of plaster?
About 0.06 bag (3 kg) for 12 mm in 1:6.
Area in sq ft?
Sq ft ÷ 10.764 = sq m.
1:4 vs 1:6?
1:4 has more cement and is stronger; good for outside walls.
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Updated 13 Nov 2026 · Desktop N Calculator v1.2.0