How many bags of concrete to set fence or deck posts.
60-LB BAGS NEEDED
— bags
to set postsUsage Tip
Dig holes 1/3 the post length deep, flare the bottom, and crown the concrete above grade to shed water.
THE MATH
Concrete = π × r² × depth × 0.7
Where: 0.7 leaves room for the post • ÷1728 = cu ft
• 60-lb bag = 0.45 ft³
• Dig holes 1/3 the post length deep
• Dig holes 1/3 the post length deep