Cement Bag Calculator - How Many Bags of Concrete
Find out how many bags of cement or concrete mix your project needs.
Cement bags needed
76 bags
75,0
Exact bags
1,200 m³
Volume
A 25 kg bag yields ~0.016 m³ (guide). Check the manufacturer's exact yield.
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Frequently asked questions
How much does a 25 kg cement bag cover?
A 25 kg bag of dry concrete mix yields about 0.016 m³ (roughly 12 liters). With that reference, a 4x3 m slab 10 cm thick (1.2 m³) needs about 75 bags.
How do I calculate slab volume?
Multiply length x width x thickness. For example, 4 m x 3 m x 0.1 m = 1.2 m³. Then divide the volume by each bag yield.
How Many Bags of Concrete Do I Need?
The calculation is simple: volume in m³ = length x width x thickness. Then divide the volume by the bag yield (usually 0.016 m³ per 25 kg bag). Always round up and add 10% for waste and compaction.
Tips for Your Concrete Project
Check the exact yield on the manufacturer bag before buying. For large slabs, consider ready-mix concrete delivered by truck - it is more economical from around 1 m³. The minimum recommended thickness for an interior slab is 10 cm.