Tree-Value Scenarios: Unit Cost and Adjustment Factors Need an External Basis; illustrative quantitative diagram
Define the quantity before calculating
The same geometric trunk area can produce different scenario totals when the unit cost or adjustment factors change. Those inputs need a justified external basis. The arithmetic does not determine species desirability, condition or a market price on its own.
Use Tree Value Calculator with the units and the basis stated on its form. Check what each input represents before carrying the output into another record.
Read the model explicitly
Illustrative value scenario = π × (diameter cm / 2)² × user cost per cm² × entered factor fractions.
The Trees & Forestry Calculators group sits within Biology calculators. Keep a measured observation distinguishable from a hypothetical input when moving between its tools.
A worked unit check
| Input as labeled on the tool | Illustrative value |
|---|---|
| Recorded circular-equivalent trunk diameter (cm) | 30 |
| Externally justified base cost per cm² trunk area | 2 |
| User-selected species factor (%) | 100 |
| User-selected condition factor (%) | 80 |
| User-selected location factor (%) | 80 |
| Currency label (no exchange-rate conversion) |
| Output from the illustrative inputs | Value | Unit |
|---|---|---|
| Circular-equivalent trunk area | 706.858 | cm² |
| User-factor valuation scenario | 904.779 | USD |
Record the original input and its unit with this result. Recalculate when the measurement basis changes; changing a unit label after calculation does not convert the quantity. More decimal places do not remove sampling or measurement uncertainty.
Illustrative scaling only; not a certified appraisal, insurance value or tax valuation.
A related quantity
Tree Diameter Calculator addresses a related part of the task. Check its own input definition before carrying a number across.
Continue with A Tree Calculator Is Not a Certified Appraisal or a Timber Sale Price for the other part of this measurement question.
Return to GreenCalc for other subjects. Keep raw observations, chosen assumptions and calculated quantities identifiable so a later revision does not overwrite the basis of the original record.
By GreenCalc · Updated 2026-11-06