Standard diameter at 1.3 m. The tool converts DBH → girth.
Enter stem diameters (mm) measured at the same height (typically 1.3 m). Equivalent stem is calculated automatically.
For ≤5 stems: √(Σ d²). For ≥6 stems: mean(d) × √n.
Equivalent DBH: — mm
Use for coppice stools, complex multi-stem trees or other forms where White cannot be applied to the BS5837 equivalent diameter. Record the basis below.
ATF & FCIN12 assume 1.3 m. If not, the comparison is approximate.
If you enter DBH, this is auto-filled using girth ≈ π × DBH.
Select the core development category per White (FCIN12). This replaces the separate “growth conditions” modifier.
This species is not included in the FCIN12 Table 1a dataset used by VERA. Please select a proxy species from the full FCIN12 list. The proxy affects the FCIN12 age estimate only.
How proxy selection works (FCIN12)
FCIN12 (White, 1998) requires a proxy species when the selected tree species is not listed in Table 1a.
VERA will apply the selected proxy species’ Table 1a values together with the chosen growth context. OpenBARD continues to use the actual selected species/genus where suitable reference data are available; Integrate+ habitat interpretation uses the actual species and DBH where its reference data support that comparison.
Recorded as contextual risk information alongside the veteran-tree evidence.
Uses device/browser location. You can also type coordinates manually.
Photos stay on this device and can be included in the current report or PNG. Portrait images generally give the cleanest report layout.
Veteranisation features / Veteran Architecture Index (VAI)
Condition route
Record how far each veteran structure has developed. Established or Advanced evidence in at least one qualifying feature supports Gate 2.
Veteran Architecture Index (VAI) — restructuring gate
How the veteran structure gate works
VAI reads the structural history of the tree: retrenchment, reiteration, functional reorganisation, recovery after failure or management, decay with adaptive living response, and rooting strategies that sustain an old structure. Emerging and Progressing observations provide life-history context; Established and Advanced observations provide the gate evidence. Heartwood decay and aerial roots contribute where they form part of an established veteranisation process. TreMs are recorded separately as habitat evidence.
Professional judgement
Professional judgement is central. Your experience remains invaluable when interpreting the tree’s veteran character, survival history and any uncertainty.
Tree-related microhabitats / habitat evidence
Counts (0–10). Confirm the catalogue threshold where needed. VERA records the exact TreM identity, scale/threshold and replacement class; Integrate+ is used only to interpret habitat rarity for comparable species and actual DBH where the data support it.
Any recorded TreM is treated as assessed. If none are recorded, choose “Assessment complete” before VERA treats zero TreMs as a real observation rather than missing data.
Cavities & hollows (1–15)
Exposed wood, bark structures & damage (16–25)
Deadwood & breakage (26–28)
Deformities & growth forms (29–33)
Fungi & slime moulds (34–39)
Epiphytes & plants (40–44)
Nests (45–46)
Microsoils & deposits (47–50)
Exudates (51–52)
Heritage value
Heritage value is a living connection to the past. Select the significance of the individual tree; notes are carried into the assessment as supporting commentary.
Cultural value
Cultural value concerns how people experience, recognise and identify with the tree. Select the significance of the individual tree; notes are carried into the assessment as supporting commentary.
VERA assessment
Reasoned assessment
Public beta. Please report unexpected results using the feedback button.
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Saved trees
No trees saved in this browser yet.
Data & backup
Tree records are stored locally in this browser and mirrored in its browser database. A JSON backup can be moved between devices or restored after a browser reset. Assessment photographs are session-based and can be included in the current report or PNG.
How this assessment is assembled
Methods & sources
VERA principle: VERA reconstructs the tree biography from distinct evidence sources. ATF identifies ancient trees; White/FCIN12 interprets maturity, indicative age and developmental time; VAI records established veteran restructuring; OpenBARD reports species-relative physical size/form; Integrate+ interprets TreM richness/occurrence rarity around the subject's actual DBH; TreM replacement classes describe recreation difficulty; heritage and cultural selections record the human story.
Sources: White, J. (1998), Estimating the Age of Large and Veteran Trees in Britain (FCIN12); OpenBARD / Handbook of UK Urban Tree Allometric Equations and Size Characteristics; Ancient Tree Forum girth guidance; Lonsdale (2013); Bütler et al. (2024) Tree-related Microhabitats field guide; Integrate+ tree-level TreM reference data.
Integrate+ data scope: the current tree-level host dataset provides species, DBH and TreM richness/count. Exact TreM codes and global frequencies are shown separately as composition evidence; species-specific code percentiles are reserved for host-by-code data when that evidence is available.
Outputs are indicative diagnostic estimates and should be interpreted by a competent arboricultural professional.
