Why ConcreteCalc
Get concrete volume and bag counts for slabs, footings, beams, columns, stairs and sonotubes — metric or imperial, with waste factor and ready-mix rounding.
Every shape
Slab, footing, beam, column, stairs, sonotube.
Bag counts
25/30/40 kg and 40/60/80 lb presets, custom too.
Waste factor
Add 0–15% and round like a pro.
Ready-mix mode
Rounds up to the 0.25 m³ truck increment.
Metric & imperial
m³, yd³, ft³ — converted exactly.
Mesh sheets
BS-style mesh coverage with overlap.
How it works
Pick a shape
Enter dimensions in your units.
Set bag or truck
Bag size or ready-mix delivery.
Read the order
Volume, bags and waste included.
FAQ
How accurate are bag yields?
Presets follow manufacturer data-sheet yields (≈0.47–0.50 L per kg) and are fully overridable.
Does it round up?
Yes — bags always round up so you don't come up short.
Stairs too?
Yes — steps plus optional waist slab.
Who is it for?
Contractors, DIYers and estimators who want a defensible order.
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