Postcrete Calculator.
Estimate postcrete bags for fence posts, signs and small concrete holes.
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Instant Results
Postcrete bags
30bags
Rounded bag count including waste.
Concrete volume
0.32m3
Estimated fill volume including waste.
Explanation
What this calculates
Hole dimensions are converted from millimetres to metres before calculating cylindrical volume.
Formula
Volume = holes x pi x radius2 x depth; bags = volume / yield per bag
Inputs are validated on screen and converted where unit options are available.
Worked Example
Example result
Ten 250 mm diameter holes at 600 mm deep need about 30 x 20 kg bags at 0.011 m3 yield.
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Templates
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Software
Turn it into a workflow
Learn before you act.
More related articles are planned for this section.
Calculator questions.
Should I account for the post volume?
For tighter estimates deduct the post volume, but many site orders keep the allowance for tolerance and spillage.
Does this apply to structural foundations?
No. Use engineered concrete specifications for structural work.
Next Step
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