Enter the manufacturer's wet-mix yield per bag in cubic metres. Bag mass alone cannot establish a universal yield. The reserve-adjusted target volume is divided by yield and rounded up to whole bags. Purchased volume describes the entered yield, not guaranteed jobsite coverage. Check mixing instructions and product suitability.
Worked reference example
Illustrative inputs in metres and SI units; the price is an example entered by the user, not a market quotation. Numeric reference verified by the automated test suite.
- Required volume
- 1
- Manufacturer yield per bag (m³)
- 0.012
- Allowance
- 10
- Price per purchase unit
- 2
- Result
- 92
- Cost (example currency units)
- 184
Calculation method
N = ceil(V × (1 + r / 100) / Vₛ)Measure. Calculate. Build.
- Use actual dimensions and split complex rooms into rectangles.
- Allow for cuts, joints and package sizes. Compare stock formats.
- Combine your results in a shopping list you can save and print.
Sources & limits
Planning estimates; verify measurements and product data before purchasing.
Prices are supplied by you. Area estimates do not establish a feasible cutting arrangement. These tools do not assess structural loads or issue construction approvals.