How to use this calculator
Estimate concrete volume for fence, deck, or sign post holes.
How the calculation works
- Enter the project dimensions or quantities.
- Choose the unit and optional waste factor where relevant.
- Review the rounded material estimate and supporting details.
Formula
Concrete volume = hole cylinder volume - optional post cylinder volume, multiplied by hole count.
Example
Eight 12 inch diameter holes at 36 inches deep around 4 inch posts need about 0.68 cubic yards with 10% waste.
Understanding your result
Use the output as a practical starting point, then review it before using it in an important workflow.
Assumptions and limitations
- Quantity estimate only. Hole sizing depends on soil, loads, frost depth, and local requirements.
Frequently asked questions
Does this require an account?
No. The core tool works without creating a Tool2Do account.
Is my input included in share links or analytics?
No. Tool2Do share actions use the tool page URL and safe metadata, not private values or uploaded files.