Plaster calculator
Plaster volume, cement bags and sand for an area.
How it is calculated
Wet volume = area × thickness. Dry volume = wet × dry factor (1.27 by default, covering bulking, joints and uneven surfaces). Cement and sand from the mix ratio; cement at 1,440 kg/m³.
Check locally: The dry factor is a common assumption you can edit.
Questions
What thickness should I use?
Commonly 12 mm for internal walls, 15–20 mm for external walls and 6 mm for ceilings. Follow your specification.
Is anything I enter saved or sent?
No. The calculation runs in your browser. Nothing you type is sent anywhere. You can copy the result, print it or download it as a CSV.