CEMIX MULTICRETE 25 kg
New Zealand · ≈ 0.012 m³
Estimated bags (rounded up):
Manufacturer sourceRead on: 2026-10-07
Concrete Slab Calculator
Enter a rectangular area, depth, and an optional waste allowance to estimate concrete volume and package counts.
One rectangular volume only. Waste is your estimate, not a construction recommendation. Product yields are manufacturer-specific approximations; confirm your actual packaging. This tool does not design structures, determine strength or load capacity, or guarantee construction results. Calculated locally, without uploads or storage.
Volume and bag estimates
Base volume:
Volume including waste (m³):
Volume including waste (ft³):
Volume including waste (yd³):
These are approximate yields for the named product and package, not universal yields for a bag weight. Each row is an alternative product estimate; do not add the counts together.
CEMIX MULTICRETE 40 kg
New Zealand · ≈ 0.019 m³
Estimated bags (rounded up):
Manufacturer sourceRead on: 2026-10-07
QUIKRETE Concrete Mix No. 1101 — 60 lb
United States · ≈ 0.45 ft³
Estimated bags (rounded up):
Manufacturer sourceRead on: 2026-10-07
QUIKRETE Concrete Mix No. 1101 — 80 lb
United States · ≈ 0.6 ft³
Estimated bags (rounded up):
Manufacturer sourceRead on: 2026-10-07
Bags using your yield:
Volume = length × width × depth after conversion to metres. Adjusted volume = volume × (1 + waste/100). Bag count = ceiling(adjusted volume / yield). 1 ft = 0.3048 m; 1 in = 0.0254 m; 1 yd³ = 0.764554857984 m³. Counts use unrounded values. Volumes display up to 4 decimals, or scientific notation for nonzero values below 0.00005.
A QUICK WALKTHROUGH
How to use this tool
- Choose metric or imperial dimensions.
- Enter length, width, depth, and your estimated waste allowance.
- Compare the named product estimates or enter a yield from your package.
One rectangular volume
The calculator converts dimensions to metres, multiplies length × width × depth, and applies the waste percentage you choose. It does not model steps, footings, multiple shapes, reinforcement, or placement loss.
Product-specific package estimates
Listed bag yields are approximate values for the named product and package, based on manufacturer information. They are not universal yields for a bag weight. Confirm the package label; custom yield lets you use the value for your own product.
Planning estimate only
This tool does not design structures, determine concrete strength or load capacity, or guarantee construction results. All calculations stay in your browser; there are no uploads or stored inputs.
GOOD TO KNOW
Common questions
Can I calculate a footing or several shapes?
This calculator covers one rectangular volume only. Calculate separate rectangles individually and add them yourself; irregular shapes and structural design are outside its scope.
Are the bag counts guaranteed?
No. Manufacturer yields are product-specific approximations. Check the exact package and add any allowance appropriate to your project.
What does the waste percentage mean?
It is an allowance you choose, from 0% to 50%. The tool does not recommend a construction waste value.