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Bag count from volume
Divides the order volume by the yield of one bag and rounds up, because part bags cannot be bought. Check the yield printed on the bag, as it varies with weight.
The Formula
n = ceil(V_total / y)
Divides the order volume by the yield of one bag and rounds up, because part bags cannot be bought. Check the yield printed on the bag, as it varies with weight.
| Symbol | Meaning | Unit | Notes |
|---|---|---|---|
| V_total | Order volume | cubic metres | Volume including the waste allowance. |
| y | Yield per bag | cubic metres | Mixed volume one bag produces, around 0.0125 for a 25 kilogram bag. |
| n | Bag count | bags | Rounded up to the next whole bag. |
What Each Symbol Means
V_totalcubic metres
Order volume
Volume including the waste allowance.
ycubic metres
Yield per bag
Mixed volume one bag produces, around 0.0125 for a 25 kilogram bag.
nbags
Bag count
Rounded up to the next whole bag.
See It Worked With Real Numbers
A formula on its own does not tell you which number goes where. The how to calculate concrete volume page applies this equation to a concrete case, shows every intermediate step, and names the mistakes that produce a wrong answer even when the algebra is right.
Where This Formula Appears
This equation is the working core of How To Calculate Concrete Volume, filed under Everyday Life. Every number the guide produces comes from substituting into this one line.