Concrete Calculator
Calculate concrete volume and bags needed for slabs, footings, and post holes
Shape Selection
Dimensions
Enter concrete area and depth
m
In meters
m
In meters
mm
In millimeters
Mix Options
%
10-15% typical
Results
Volume
2m³
Volume (incl. waste)
2.2m³
Bags Required
📦184
⏱️ Curing Tip: Concrete takes 28 days to fully cure. Protect from weather and foot traffic for at least 48 hours.
How to Use
- 1Select shape: slab, footing, or post holes
- 2Enter dimensions in meters or millimeters as shown
- 3Specify concrete depth/diameter
- 4Account for waste (10-15% typical)
- 5Choose between pre-mix bags or mix on-site
- 6Review material requirements
Example
5m × 4m concrete slab at 100mm depth
Inputs:
Shape: Slab\nDimensions: 5m × 4m × 100mm\nWaste: 10%
Results:
Volume: 2.2 m³\nBags (25kg): 184\nMix (1:2:4): Cement 570kg, Sand 3.08 m³, Aggregate 6.16 m³