01
Construction2 options compared
Post Hole Concrete Calculator
Calculates the amount of concrete needed for post-holes based on depth, diameter, and mix ratio. Enter dimensions, select concrete type, and the calculator provides volume and total material required. Homeowners, builders, and landscapers using in-ground structures like fences, trellises, or retaining walls will find this tool helpful for ensuring they have enough concrete to fill post-holes...
Editors’ Top PickBased on community votes
Other OptionsRanked by votes
- 02
02GQ Calcgqcalc.comCalculate concrete around round or square posts with post displacement, multiple holes, waste, bag yield, and roundin...
Side by side
Post Hole Concrete Calculator options compared
| Tool | Best for | Strengths | Limitations |
|---|---|---|---|
| Omni Calculator omnicalculator.com | Quick volume estimates |
|
|
| GQ Calc gqcalc.com | Bag-yield planning |
|
|
Buyer's guide
How to choose a post hole concrete calculator
When the main goal is to know how much concrete to order by volume, a simple dimension entry is fastest. If you need to buy bags and account for waste, extra material, or different post shapes, look for a calculator that lets you set bag yield and rounding preferences. The difference matters most for larger projects where a few extra bags affect cost and logistics.
Questions
Post Hole Concrete Calculator FAQ
- How do I account for the post itself when calculating concrete volume?
- Both calculators subtract the post volume from the hole volume. Omni Calculator does this automatically based on the post dimensions you enter, while GQ Calc labels it as "post displacement" and shows the net concrete volume separately.
- Should I order concrete by cubic yards or number of bags?
- For small jobs under about 0.5 cubic yards, bag counts are easier to manage at a local store. For larger volumes, cubic yards are more cost-effective and typically delivered by mixer truck.
- What concrete waste percentage should I build into my order?
- A standard 5–10% waste factor is common for most residential post holes. GQ Calc lets you set this as a percentage of the total volume, which helps avoid running short if the mix spills or the hole is slightly larger than measured.
- Can I use these calculators for sonotube or sonotube-style posts?
- Yes, treat the sonotube as the post diameter and enter the surrounding hole diameter to get the annular space volume. Both tools will subtract the inner cylinder from the outer cylinder to find the concrete needed.
- Do I need to measure the depth of the hole or the depth of concrete fill?
- Measure the concrete-filled depth—the distance from the bottom of the hole to the top of the poured concrete. If you leave a gravel base or have an unfilled top, exclude those from the depth measurement.
Keep Exploring