Measure Length, Width and Depth
Measure one rectangular slab or pad. Use the finished concrete thickness as the depth value and keep all dimensions in metres.
Volume per slab = length × width × depth
Concrete Tool
Concrete Calculator
Estimate concrete volume, waste allowance and material cost for rectangular slabs and pads.
Metric Calculator
How this calculator works
Concrete volume is calculated as length × width × depth.
The volume of one slab is multiplied by the quantity of identical slabs.
Waste allowance is applied to the total gross concrete volume.
Estimated material cost equals final concrete volume multiplied by the entered price per cubic metre.
CONCRETE PLANNING GUIDE
Calculate Concrete Volume, Waste and Cost Before You Order
Use the calculator result as a planning estimate for rectangular slabs and pads. Measure carefully, keep every dimension in metres, and confirm the final order with your concrete supplier or contractor.
Account for Identical Slabs
If the project contains several slabs with the same dimensions, enter the quantity so the calculator can combine their volume.
Gross volume = volume per slab × quantity
Add a Waste Allowance
Waste allowance helps cover small losses, uneven surfaces and practical site conditions after the gross concrete volume is known.
Waste volume = gross volume × (waste % ÷ 100)
Find the Final Concrete Volume
The calculator adds the waste volume to the gross volume to produce the final concrete quantity used for planning.
Final volume = gross volume + waste volume
Estimate the Material Cost
Enter an optional supplier price per cubic metre to estimate the concrete material cost for the calculated final volume.
Estimated cost = final volume × price per m³
Confirm the Order Before Pouring
Review the dimensions, quantity, waste percentage and supplier price before ordering. Site conditions may affect the final amount.
Planning order quantity = final concrete volume
Use the Result as a Planning Estimate
Concrete requirements depend on accurate dimensions and the actual conditions of the slab, pad or pour area.
Confirm the final ordering quantity, delivery requirements and any supplier minimums with the concrete supplier or contractor before placing the order.