Concrete for a 5m x 5m Slab, 15 cm Thick (Heavy Load)
A 5m x 5m concrete slab at 15 cm thickness for heavy equipment or machinery requires 3.75 cubic metres of concrete.
How to use this tool
- Enter slab length, slab width and slab thickness in the fields above.
- Results update instantly as you type — or click Calculate.
- Read your concrete volume and the full breakdown beneath it.
Heavy loads like machinery or hot tubs require a thicker slab — calculate the concrete needed for a 5m x 5m slab at 15 cm depth.
Frequently asked questions
- How many bags of concrete do I need for a slab?
- Calculate volume in m³ = length × width × thickness (m). A 20 kg bag covers about 0.01 m³, so divide your volume by 0.01 and round up.