Concrete Calculator
Estimate the concrete volume and cement bags needed for a slab.
Planning a concrete slab and need a rough material estimate before you order? Lilu Baba's Concrete Calculator works out the volume from your slab's length, width and thickness, and estimates the cement bags needed assuming a standard M20 mix.
How to use this calculator
- Enter the slab length and width in metres.
- Enter the slab thickness in centimetres.
- Volume and an estimated cement bag count (M20 mix) update instantly.
Concrete Volume (m³)
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Estimated Cement Bags (50kg)
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FAQ
Concrete Calculator — frequently asked questions
It assumes a standard M20 mix (~8 bags of 50kg cement per cubic metre) as a general rule of thumb. Actual requirements vary by mix design, wastage and local practice — confirm with your contractor or supplier.
Cubic metres (m³), calculated from length × width × thickness (thickness is converted from centimetres to metres automatically).