CTLA Trunk Formula Method

Tree Value Calculator

Find out what your tree is worth in under a minute — the same appraisal method arborists and insurers use.

CTLA Trunk Formula
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Tree Value Calculator

Want to know the value of your tree? Use our free calculator to get a quick estimate based on its size, species, and condition. Our calculator uses the CTLA Trunk Formula Method, a common method used for tree appraisals. For more tree service estimates, check out our other calculators.

Enter Your Tree's Details

Measured at 4.5 ft above ground. Wrap a tape around the trunk and divide circumference by 3.14 if that's easier.
Native, durable hardwoods rate highest. Weak-wooded or short-lived species rate lowest.
80%
Crown density, structure, decay, pest damage. 100% = flawless specimen, 25% = severely declining.
70%
Contribution to the site — shade, screening, curb appeal, prominence. Front-yard specimen trees rate highest.
Advanced: adjust regional unit cost & replacement tree
Set by your regional ISA chapter from local nursery survey data. Published figures run roughly $35–$75+/sq in — Indiana lists $36.50, Utah lists $72. Check your chapter's RPAC guide for an exact figure.
Cost of the largest commonly available nursery tree, delivered and planted. Regional surveys put this around $400–$1,500.
Trunk diameter of that largest commonly available nursery tree. Most regional guides use 2.5–3.5 in for shade trees.
Typical Appraised Value Range
$— – $—
Complete the form to generate an estimate
Appraisal Breakdown
Trunk Cross-Sectional Area
Replacement Tree Area (baseline)
Trunk Area Increment
Replacement Installed Cost
Unit Basic Cost
Basic Value (before depreciation)
Species Factor
Condition Factor
Location Factor
Estimated Appraised Value $—
⚠️ Estimate Variance This values the tree's landscape/amenity contribution, not its timber worth. Unit costs and condition/location ratings vary by region and appraiser judgment. For insurance claims, litigation, or tax purposes, hire an ISA Certified Arborist for a documented appraisal.
How It Works

How Our Tree Value Calculator Works

Find your tree's estimated value in five easy steps.

1

Measure the Trunk

Measure the trunk 4.5 feet above the ground to find the tree's size.

2

Choose Your Tree

Select the tree species that best matches your tree.

3

Check Its Condition

Choose a rating based on the tree's health, branches, and damage.

4

Choose Its Location

Tell us how important the tree is to your property.

5

See Your Tree Value

We use your answers to give you an estimated tree value.

Our Method

How We Calculate Your Tree's Value

Our estimate follows the CTLA Trunk Formula Technique — the current (10th Edition) standard published by the Council of Tree and Landscape Appraisers. Here's what goes into the calculation.

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1. Trunk Cross-Sectional Area

We convert your trunk diameter (DBH) into a cross-sectional area using π × (DBH ÷ 2)². Because area grows exponentially with diameter, size is by far the biggest driver of a tree's appraised value.

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2. Replacement Tree Baseline

We start from the real installed cost of the largest commonly available nursery tree, then only price the additional trunk area beyond that baseline — the Trunk Area Increment. This avoids overstating large, mature trees.

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3. Unit Basic Cost

The incremental trunk area is priced at a $ per square inch rate set by regional nursery survey data. This varies significantly by state and species — you can adjust it in the Advanced settings.

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4. Species Factor

Rates genetic quality and longevity. Durable native hardwoods like oaks and sugar maples score highest; weak-wooded or short-lived species like Bradford pear score lowest.

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5. Condition Factor

Reflects crown density, structural integrity, decay, and pest pressure. A flawless specimen rates near 100%; a severely declining tree rates much lower.

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6. Location Factor

Captures the tree's contribution to its site — shade, screening, curb appeal, and prominence. A front-yard specimen tree scores higher than one tucked in a back corner.

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Our Basic Calculation

The calculator combines these factors using the CTLA Trunk Formula Technique.

Trunk Area Increment = Trunk Area − Replacement Tree Area Basic Value = Replacement Installed Cost + (Trunk Area Increment × Unit Basic Cost) Appraised Value = Basic Value × Species Factor × Condition Factor × Location Factor
Why do we show a value range? Field studies of the CTLA method show meaningful variation between appraisers on the same tree — mostly from condition and location judgment calls. We show a range around the calculated value to reflect that normal variation, rather than implying false precision.

Important: This estimates landscape/amenity value, not timber worth, and is a planning estimate, not a certified appraisal. For insurance claims, litigation, or tax purposes, hire an ISA Certified Arborist or ASCA consulting arborist to produce a documented appraisal.

FAQ

Tree Value Calculator FAQs

Common questions about estimating the value of a tree.

QHow much is my tree worth?

Tree value depends on species, trunk size, tree condition, location, and the quality of the wood. Use our calculator to get an estimated value based on your tree details.

QWhat factors affect a tree's value?

Species, trunk diameter, tree condition, wood quality, and location can all affect the estimated value of a tree.

QDoes tree size affect its value?

Yes. Larger trees generally contain more usable wood, so trunk size and overall dimensions can have a major effect on estimated value.

QAre all tree species worth the same?

No. Different species have different wood qualities and market values, so species is an important part of estimating a tree's value.

QCan I calculate the value of a tree in my yard?

Yes. Enter your tree's species, size, and other required details to get an estimated tree value.

QIs the tree value calculator accurate?

The calculator provides an estimate based on the information you enter. Actual market value can vary depending on local demand, tree condition, access, and professional appraisal.

QDoes tree condition affect its value?

Yes. Healthy, high-quality trees may have greater value than trees with disease, damage, decay, or other structural problems.

QCan a tree be worth money even if it is standing?

Yes. A standing tree may have potential timber value, but the actual amount depends on the species, size, quality, accessibility, and local market conditions.

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