How it works
Bags = ceil(required m³ × 1000 × (1+waste fraction) / stated litres of wet yield per bag).
Input definitions
- Required concrete volume (m³)
- Enter the value in the labeled unit.
- Manufacturer wet yield per bag (litres)
- Enter the value in the labeled unit.
- Waste allowance (%)
- Enter the value in the labeled unit.
- Price per bag
- Enter the value in the labeled unit.
A worked example
- Required concrete volume (m³)
- 0.5
- Manufacturer wet yield per bag (litres)
- 10
- Waste allowance (%)
- 10
- Price per bag
- 5
Assumptions & limits
Quantity estimate only. Mix strength, reinforcement, sub-base, curing, delivery and local construction requirements are outside scope.
Sources & review
Maintained by AnsRio. Methods and examples use automated checks; this does not imply independent professional certification.
Method updated 2026-10-17. Content checked against the stated method and examples. Our verification approach.
Common questions
Can I use the bag’s kilogram weight as its concrete yield?
No. Kilograms measure mass; litres or cubic metres measure wet mixed volume. Enter the manufacturer’s stated volume yield for the specific product.
How does Premixed concrete bag quantity work?
Bags = ceil(required m³ × 1000 × (1+waste fraction) / stated litres of wet yield per bag).
What are the limits of Premixed concrete bag quantity?
Quantity estimate only. Mix strength, reinforcement, sub-base, curing, delivery and local construction requirements are outside scope.