Enter the approximate depth of the post hole you want to dig in inches. Remember, the depth of the post hole should be one-half of the above-ground post height. (Example: For a 6′ above ground post, use a post with an overall height of 9 feet and place 3 feet in the ground.) The calculator will indicate the estimated number of 25 kg (56 lb) of QUIKRETE® POST HASTE® Concrete Mix or QUIKRETE® Fast Setting Concrete Mix. Yields are approximate and will vary based on placement methods, equipment utilized and do not include allowance for uneven subgrade, waste, etc.