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Concrete calculator.
How many cubic metres of concrete for a slab, foundation or path? Enter the dimensions and get the volume, cement, aggregate and cost.
m³ = length × width × thickness × (1 + allowance) · C25/30: about 350 kg cement, 1.85 t aggregate and 175 l water per m³
How to calculate concrete for a slab or foundation.
- 1
Measure the dimensions
Length and width in metres, thickness in centimetres. For strip foundations work out each strip separately.
- 2
Add an allowance
5 % is enough for a flat slab, 8 to 10 % for uneven ground and excavations.
- 3
Ready-mix or site-mixed
For more than 1 m³ ready-mix from the plant pays off. For small amounts mix it yourself to the ratio.
FAQ
How many cubic metres of concrete for a slab, foundation or path? Enter the dimensions and get the volume, cement, aggregate and cost.
For C25/30 concrete about 350 kg of cement, or 14 bags of 25 kg, with about 1.85 t of aggregate and 175 l of water.
Multiply length, width and thickness in metres. A 6 × 4 m slab 15 cm thick is 3.6 m³.
In AdBooks you save concrete, rebar and labour as items, then send the job quote in 5 minutes.