Post Hole Calculator

Calculation Assumptions

Holes are treated as cylinders and the post itself is not subtracted from the concrete volume — a conservative, standard practice that accounts for uneven holes and post displacement. Bag yields (40 lb ≈ 0.30 ft³, 60 lb ≈ 0.45 ft³, 80 lb ≈ 0.60 ft³) and cured concrete density (≈133 lb/ft³) are typical planning values. Always verify quantities and prices with your supplier and local building codes.