Post Hole Concrete Calculator
Use this post hole concrete calculator to estimate how much concrete you need for fence posts and similar ground-set supports. Enter the hole size, post size, depth, and quantity to get a fast volume and cost estimate.
Result
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What This Post Hole Concrete Calculator Helps You Do
Use this post hole concrete calculator to estimate how much concrete you need for fence posts and similar ground-set supports. Enter the hole size, post size, depth, and quantity to get a fast volume and cost estimate.
How to Calculate Post Hole Concrete Calculator
- Measure the post hole concrete inputs - Enter the dimensions, density, spacing, or strength values shown on the page.
- Check the units - Keep every input in the same unit system so the result stays consistent and easy to compare.
- Choose the solve mode - Select the calculation you want to run, such as weight, volume, cost, count, or reaction.
- Read the output - Use the main result and the extra detail rows to confirm the estimate before you order or build.
Post Hole Concrete Calculator Formula
| Symbol | Definition | Unit |
|---|---|---|
| w | Hole width | m |
| t | Hole thickness | m |
| d | Hole depth | m |
| p_w | Post width | m |
| p_t | Post thickness | m |
| p_d | Post depth | m |
| n | Quantity | count |
Worked Examples
- holeWidth: 0.3
- holeThickness: 0.3
- holeDepth: 0.9
- postWidth: 0.1
- postThickness: 0.1
- postDepth: 0.75
- quantity: 6
- concretePricePerM3: 125
Result: Concrete volume = 0.44 m3
A row of fence posts becomes easier to budget when each footing is calculated first. The estimate is 0.44 m3.
- holeWidth: 0.35
- holeThickness: 0.35
- holeDepth: 1.0
- postWidth: 0.12
- postThickness: 0.12
- postDepth: 0.8
- quantity: 1
- concretePricePerM3: 140
Result: Concrete cost = 15.54 $
A simple budget helps you compare bags, ready-mix, and delivery charges. The estimate is 15.54 $.
- holeWidth: 0.4
- holeThickness: 0.4
- holeDepth: 1.2
- postWidth: 0.15
- postThickness: 0.15
- postDepth: 1.0
- quantity: 4
- concretePricePerM3: 130
Result: Concrete volume = 0.68 m3
Heavier structures need deeper holes and more concrete around the buried post. The estimate is 0.68 m3.
- holeWidth: 0.3
- holeThickness: 0.3
- holeDepth: 0.95
- postWidth: 0.1
- postThickness: 0.1
- postDepth: 0.8
- quantity: 12
- concretePricePerM3: 120
Result: Concrete cost = 111.60 $
Long fence runs are easiest to plan by multiplying a single footing estimate by the total post count. The estimate is 111.60 $.
How to Interpret Your Results
| Range | Meaning | Action |
|---|---|---|
| < 0.1 m3 | Small footing | Usually suitable for light-duty posts and compact installs. |
| 0.1–0.5 m3 | Typical footing | Common for fence posts, gates, and small structural supports. |
| > 0.5 m3 | Large footing | Check excavation limits, frost depth, and delivery access before pouring. |
Frequently Asked Questions
Sources
Last reviewed: March 2026