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.
Form: Post hole
Units:
Examples:
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 tips
- 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.
- Round up bag counts; post holes can take more due to loose soil and uneven sides.
- Consider gravel at the bottom for drainage where appropriate.
Other forms
Assumptions
- 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.