Practical guide
How to measuring post holes and concrete yield
Measure and document project-controlled inputs for the Post Hole Concrete Volume and Bag Calculator.
Use this checklist before opening the Post Hole Concrete Volume and Bag Calculator.
Inputs to record
- Round hole diameter: record the value in in and its source.
- Square post width: record the value in in and its source.
- Concrete depth: record the value in in and its source.
- Identical holes: record the value and its source.
- Order allowance: record the value in % and its source.
- Yield per bag: record the value in ft³ and its source.
Draw and measure
Draw each straight run or clear opening and label its start and end boundary. Separate gates, corners, posts and discontinuities. Recheck measurements before applying a whole-item ceiling.
Controlled values
A code, system, manufacturer or professional may control spacing, openings, embedment, footing, component size or fastening. Obtain that value outside the calculator and record the source. The calculator only distributes or totals the value you enter.
Handoff
Keep the input record with the estimate. Confirm current documents, product availability and field conditions before purchase or construction.
References and further reading
These sources define or explain the calculation. Source editions and model limits are part of the result—not decorative citations.
- NIST Guide to the SI, Chapter 8, National Institute of Standards and Technology; accessed 2026-08-22. COMMON-NIST-SI