Calculate bark thickness and bark volume, then convert over-bark measurements to under-bark for accurate timber pricing. Species-specific bark factors for Indian, European and tropical species.
Over Bark to Under Bark Converter
Auto-set by species. You can override manually.
Enter measured value to override species factor. Leave 0 to use factor.
| Position | OB Diameter | Bark Each Side | UB Diameter | Area OB | Area UB |
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All log volume formulas can be calculated Over Bark (OB) or Under Bark (UB). For timber pricing, Under Bark volume is the correct basis since bark has no commercial lumber value. This tool converts OB measurements to UB using species-specific bark factors per IS 1902:2015.