⛏️ Post Hole Calculator
Hole size, posts and fill
Hole diameter
Hole depth
(below the frost line in cold climates)
Number of holes
Post in the hole
(its volume is taken out of the fill)
No post — open hole / footing
4 × 4 post (3.5 × 3.5 in actual)
6 × 6 post (5.5 × 5.5 in actual)
6 in round post
Fill material
Concrete — bagged mix
Gravel — drainage fill
Waste allowance (%)
(extra for cuts, spills and uneven ground — 10% is the usual rule)
Calculate fill
Calculator by
CalcCoverage
— free DIY & home-improvement calculators