Compare calculators
Both calculators run independently — change the inputs on either side to compare results.
Construction
Concrete Slab Bag Calculator
Find out how many bags of pre-mixed concrete you need to pour a slab. Enter the slab length, width, and thickness, pick your bag size, and add a waste allowance to get the exact bag count for footings, patios, shed bases, and walkways.
Fill in the required fields to see your result.
Civil
Concrete Volume Calculator
Estimate the in-place concrete volume for slabs, footings, walls, and other rectangular structural elements using V = L × W × T. The geometric volume in cubic metres — add 5–10% waste before placing the order.
Fill in the required fields to see your result.
Key differences
| Concrete Slab Bag Calculator | Concrete Volume Calculator | |
|---|---|---|
| Category | Construction | Civil |
| Inputs required | 5 | 3 |
| Result | Bags of Concrete Needed (bags) | Concrete Volume Required (m³) |
| What it does | Find out how many bags of pre-mixed concrete you need to pour a slab. Enter the slab length, width, and thickness, pick your bag size, and add a waste allowance to get the exact bag count for footings, patios, shed bases, and walkways. | Estimate the in-place concrete volume for slabs, footings, walls, and other rectangular structural elements using V = L × W × T. The geometric volume in cubic metres — add 5–10% waste before placing the order. |