Concrete Bag Quantity Calculator
Bags = ceiling(volume × (1 + allowance/100) ÷ bag yield)
Estimate bagged concrete quantities using the manufacturer’s mixed yield.
Formula
Bags = ceiling(volume × (1 + allowance/100) ÷ bag yield)
Worked example
Required mixed volume: 0.5 m³
Mixed yield per bag: 0.012 m³
Allowance: 10 %
With these inputs, the result is 46 bags.
How to use this calculator
- Identify the quantity you want to calculate.
- Enter your measurements in the units shown on each field.
- Read the result, which updates as you change the inputs.
- Check the assumptions below before applying the result.
Assumptions and limits
Bag mass is not enough to determine yield. Enter the actual mixed-volume yield printed by the supplier.
Precision and checking
Results are rounded for display. Use the most accurate measurements available, and avoid rounding your inputs unnecessarily. Extra decimal places in a result do not make an estimate more reliable.
To check a result, substitute the same input values into the formula shown above. Change one value at a time to understand how the quantity responds.
Frequently asked questions
What assumptions does this calculation use?
Bag mass is not enough to determine yield. Enter the actual mixed-volume yield printed by the supplier.
Are my inputs sent to a server?
No. The calculation runs locally in your browser. The result updates as you edit the inputs.
