Calculators / Home and DIY

Concrete slab calculator

Enter the slab size and thickness. Check the bag for its yield in litres; a 25 kg bag of ready-mix concrete usually makes 11 to 13 litres.

m
m
cm
%
L
Bags of ready-mix79
Concrete volume0.90m³
Weight (at 2400 kg/m³)2,160kg

How it is calculated

Volume = length × width × thickness. Bags = volume × (1 + extra) ÷ yield per bag, rounded up. Above about 1 m³, ordering ready-mixed concrete by truck is usually cheaper than bags.

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