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.
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.
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. |