Concrete volume is not structural design
Why geometric concrete quantity cannot select dimensions, reinforcement, strength or bearing capacity.
Read guideGuided project
Pour a concrete slab
Estimate slab volume and choose ready-mix or bag quantities.
Use measured dimensions, then add bag calculations only when that purchase method applies.
Your project workflow
Work from top to bottom. Optional steps can be skipped; alternatives are grouped into one decision.
Check completed steps. You can skip optional steps.
- 1
Optional
Check rectangular volume
Validate measured dimensions with a general volume check.
Use Volume calculator - 2
Step 2
Calculate slab concrete
Estimate concrete from the measured rectangular slab and allowance.
Use Concrete slab calculator - 3
Optional
Calculate bags
Use this only when buying bagged mix with a known mixed yield.
Use Concrete bag calculator - 4
Optional
Estimate the purchase cost
Use the quantity from your chosen calculator and the supplier's package price.
Use Material purchase cost