Fence Post Concrete Table: Total concrete volume by Hole diameter
Reference table of total concrete volume for Fence Post Concrete across a range of hole diameter values — exact, engine-computed figures you can read off at a glance.
Fence Post Concrete Calculator
Verified formula Updated Jun 2026 Private — runs on your device
Verified formula
Private
Total concrete volume
0.1821
- Concrete per post
- 0.0364
For general information only — not financial, tax, legal or medical advice. Verify before you rely on it.
How to use the Fence Post Concrete Calculator
The Fence Post Concrete Calculator works out your total concrete volume, along with 1 related figure in an instant. Enter hole diameter, hole depth and post width (square) and the result updates as you type — it is free, needs no sign-up, and runs entirely in your browser so your figures stay private.
- Enter the hole diameter.
- Enter the hole depth.
- Enter the post width (square).
- Enter the number of posts.
- Read off your total concrete volume, together with concrete per post — the calculator updates automatically, with no button to press.
Formula
The Fence Post Concrete Calculator uses the formula:
Total concrete volume = (3.141592653589793 × (Hole diameter ÷ 2)^(2) × Hole depth - Post width (square) × Post width (square) × Hole depth) × Number of posts
Worked example
For example, with hole diameter of 0.3 m, hole depth of 0.6 m, post width (square) of 0.1 m and number of posts of 5, the total concrete volume is 0.1821.
| Hole diameter | 0.3 m |
|---|---|
| Hole depth | 0.6 m |
| Post width (square) | 0.1 m |
| Number of posts | 5 |
| Total concrete volume | 0.1821 |
|---|---|
| Concrete per post | 0.0364 |
Results are estimates for educational use, not professional advice.
Key terms explained
- Diameter
- The distance across a circle through its centre — twice the radius.
- Volume
- The amount of three-dimensional space an object occupies, measured in cubic units.
Frequently asked questions
Find the hole volume and subtract the post volume. A 0.3 m wide, 0.6 m deep hole with a 0.1 m post uses about 0.036 m³ each.
A common rule is to bury about one third of the post, deeper for tall fences or soft ground.
The post takes up space in the hole, so only the remaining gap is filled with concrete.
Yes. Add around 10% for spillage, uneven holes and slightly oversized digging.
The Fence Post Concrete Calculator uses the formula: Total concrete volume = (3.141592653589793 × (Hole diameter ÷ 2)^(2) × Hole depth - Post width (square) × Post width (square) × Hole depth) × Number of posts. For example, with hole diameter of 0.3 m, hole depth of 0.6 m, post width (square) of 0.1 m and number of posts of 5, the total concrete volume is 0.1821.
Enter the hole diameter. Enter the hole depth. Enter the post width (square). Enter the number of posts. Read off your total concrete volume, together with concrete per post — the calculator updates automatically, with no button to press.
Related guides
How to Calculate Fence Post Concrete: Formula, Steps & Examples
Learn how to calculate Fence Post Concrete — the formula explained step by step, with worked examples and a free calculator to check your answer.