ConcreteCalculatorHQ

Post Hole Concrete Calculator

Calculate the volume and weight of concrete needed for post holes, whether you're setting fence posts or deck piers. Enter the hole diameter, depth, and number of holes to get results in cubic yards, bags, and ready-mix truckloads. It's always smart to order a bit extra to account for irregular holes and spillage.

Post hole
Units
Concrete Volume0.38 yd³
Bags
18 × 80 lb
Weight
1,555 lb
Loads
1

How to use this calculator

  1. 1. Enter dimensions
    Fill in the required fields for this concrete form.
  2. 2. Click Calculate
    Review volume, bag counts, weight, and ready-mix loads.
  3. 3. Adjust if needed
    Open advanced options for waste, density, prices, and truck capacity.

Common examples

4 holes @ 12 in × 36 in
Common fence post scenario.
8 holes @ 10 in × 30 in
Smaller posts; adjust for your frost depth.

Estimating notes

  • Verify your local frost depth and set hole depth accordingly.
  • If you bell the bottom of the hole, add extra concrete.
  • Use the actual auger diameter—hand-dug holes often end up wider.
  • Bag yields and density vary by product; verify values on your bag or supplier spec sheet.
  • Cost estimates exclude delivery fees, taxes, and minimum loads.