How to use the timber yield calculator
Prepare the values for this calculation
Estimate recovered timber volume from gross log/timber volume and a user-entered recovery factor. 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
- Gross timber volume (m³): enter a value at least 0. Use the unit named in the label or selected above. Do not leave this required field blank.
- Recovery factor (%): enter a value at least 0 and no more than 100. 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 Estimated recovered timber first. With the unchanged example inputs, it is 55 m³. Interpret it using the formula and assumptions on this page.
Compare and keep a useful result
For a controlled comparison, keep every other example input unchanged and change Gross timber volume (m³) from 100 to 110. The resulting Estimated recovered timber is 60.5 m³. 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.
Timber Yield Calculator formula
Recovered volume=gross volume×recovery %.
Inputs and units
| Input | Format / range | Example |
|---|---|---|
| Gross timber volume (m³) | minimum 0 | 100 |
| Recovery factor (%) | minimum 0; maximum 100 | 55 |
Worked example
Using the example inputs above, the estimated recovered timber is 55 m³.
- Estimated recovered timber
- 55 m³
Results and assumptions
Planning estimate using a user-entered recovery factor; species, grade, kerf and mill rules are not inferred.
Fix an input or unexpected result
Gross timber volume (m³) is required. Enter gross timber volume (m³) 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.