Formula
- Use the units shown beside each field.
- Results update automatically whenever you change an input.
- Displayed values use up to four decimal places, or scientific notation for very small or large numbers. Calculations use standard floating-point arithmetic; exact integer and fraction tools identify their own precision rules.
- Cylindrical holes with centered square posts to full depth. Footing size and required depth are not designed by this tool.
Example Calculation
- Holes: 10
- Hole diameter: 0.3 m
- Buried depth: 0.6 m
- Square post side: 0.1 m
- Waste allowance: 5 %
Ten 0.3 m holes, depth 0.6 m and square 0.1 m posts need about 0.3823 m³ including 5% waste.
Frequently asked questions
How do I use this calculator?
Enter holes, hole diameter, buried depth, square post side, waste allowance. The result updates automatically. Use Reset to restore the example values.
What method does it use?
V=count × depth × (π diameter²/4−post side²) × (1+waste).. Cylindrical holes with centered square posts to full depth. Footing size and required depth are not designed by this tool.
Why might a rounded result differ?
The calculation keeps full numeric precision internally, then rounds the displayed result. Rounding intermediate steps by hand can produce a slightly different answer.
Are my inputs saved online?
No. This calculator processes your inputs in your browser. A recently used list stores only calculator names on this device, not your entered values.
Check the assumptions and units before using this result. Read about calculation methods.