Tree Appraisal by the CTLA Trunk Formula
The arborist bench is all biomechanics - decay, cavity, protection zone, rigging - and none of it answers what a tree is WORTH, which is the number a claim or removal dispute turns on. Value = unit cost x trunk AREA x species x condition x location, so it goes as the square of diameter: a 24-in trunk at $60/sq in and 80/70/75 ratings appraises near $11,400 against a $27,143 basic value. Every factor is a regional input; no table is shipped. An estimating aid, not an appraisal.
Formula and source
appraised value = unit tree cost ($/sq in) x trunk cross-sectional area (pi/4 d^2) x species rating x condition rating x location rating; trunk measured at 4.5 ft above grade over 12 in diameter, 1 ft at or below.
The CTLA (Council of Tree and Landscape Appraisers) trunk formula method, by name; no unit-cost or rating table is reproduced - all four are regional inputs.
Audience
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Posture
Rough Logic answers the math question the working professional asks on the job. The site is a calm, fast, ad-free, account-free, ever-free reference. It does not interpret code. It does not replace the licensed professional. It does not store your inputs. The Authority Having Jurisdiction governs all installations and inspections.