How to use the fence post depth calculator
Prepare the values for this calculation
Calculate buried and above-ground post length from total post length and a user-entered buried fraction. Use the formula below to check that it answers your question. Read the input units before transferring figures from a statement, measurement or dataset.
Enter and check each input
- Post length (ft): enter a value at least 1e-06. Use the unit named in the label or selected above. Do not leave this required field blank.
- Buried fraction (%): enter a value at least 1e-06 and no more than 99.999. Use the unit named in the label or selected above. Do not leave this required field blank.
The input table gives a complete example. Keep units and time periods consistent across related fields.
Calculate and resolve any input error
Choose Calculate after entering the values. Changes also update the answer after a short pause. If an error appears, follow its message, correct the field and calculate again. Reset restores the example values.
Interpret the answer
Check Calculated embedment first. With the unchanged example inputs, it is 2.6666 ft. Compare the additional metrics with the primary result; each has its own label and unit.
Compare and keep a useful result
For a controlled comparison, keep every other example input unchanged and change Post length (ft) from 8 to 8.8. The resulting Calculated embedment is 2.9333 ft. This illustrates the equation’s response to that input, rather than a forecast of real events.
Read the chart’s axis labels and data table. A scenario curve changes one stated input while holding the others fixed; it does not add external observations. Use Download graph to save an available chart as a PNG.
Use Copy result or Download CSV to keep the answer. Share tool shares the page address without placing your input values in the URL. Recheck inputs and assumptions before using the result for a decision.
Fence Post Depth Calculator formula
Buried depth = post length × entered buried fraction.
Inputs and units
| Input | Format / range | Example |
|---|---|---|
| Post length (ft) | minimum 1e-06 | 8 |
| Buried fraction (%) | minimum 1e-06; maximum 99.999 | 33.333 |
Worked example
Using the example inputs above, the calculated embedment is 2.6666 ft.
- Calculated embedment
- 2.6666 ft
- Above-ground length
- 5.3334 ft
- Entered buried fraction
- 33.333%
Results and assumptions
This only applies the fraction you enter. Required embedment can depend on frost depth, soil, wind, fence height and local code.
Fix an input or unexpected result
Post length (ft) is required. Enter post length (ft) using the format and bounds in the input table. Zero and an empty field are different: use zero only if it is allowed and represents your data.
If your answer differs from the example, choose Reset and compare every field, including selected units and options. Check percentage versus decimal entry and whether values describe the same period. Round only the final displayed answer when reproducing the formula.
If a discrepancy remains, report the calculator issue with the page address, non-sensitive example inputs, actual result, expected result and a reference for your calculation.