Cement Render Calculator
Estimate cement-render area, wet volume, full bags, coat coverage, material weight and cost after opening deductions.
Default project preview
19 bags
Net wall area
200 ft²
Wet render volume
9.17 ft³
Total coat area
400 ft²-coats
Total thickness
0.5 in
Calculator
Build the material order
Your order will appear here
Enter the project details and calculate a rounded material estimate.
Methodology
Transparent calculation
BuildMeter converts every input to a consistent internal unit, applies the selected allowance, and rounds products up to whole purchasable units.
Net area = wall area − openings. Wet volume = net area × thickness per coat × coats × waste factor. Bags = round up (wet volume ÷ bag yield).
BuildMeter Guides
Understand the measurements and assumptions
Use these visible reference guides before changing project inputs or planning allowances.
FAQ
Cement Render Calculator questions
Should openings be deducted?+
Large doors and windows can be deducted, while reveals and small returns may partly offset that reduction.
Why enter wet yield instead of bag coverage?+
Render thickness directly controls volume, so wet yield allows the calculation to respond to both area and coat thickness.
Does this choose a render mix?+
No. Use a compatible system for the substrate, exposure and finish specification.