Fencing & decking
Fence Concrete Calculator
Concrete for fence post holes, per post and for the whole run.
Result
The post displaces concrete, which is why the post size is subtracted. Fast-setting post mix is poured dry into the hole with water added on top and does not follow the same yield, so check the bag if you are using it.
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About this calculator
How wide should the hole be?
About three times the post width, so a 4 inch post wants a 10 to 12 inch hole. Narrower gives the concrete too little grip on the soil.
Should concrete come above ground level?
Crown it slightly above grade and slope it away from the post. Concrete finishing below grade collects water against the timber, which is exactly where posts rot.
The formula
concrete per post = hole volume - post volume; bags = total / 0.45 cubic feet
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