Formula for cubing trees

If the result in cell C1 for example:
=SUM((B1/4)*(B1/4)*A1) and you drag the formula down

since you have a length in meters, convert your circumference to meters.

Re
=SUM(C1:C15) 2 points not a semicolon
Best regards

Hello.

Nathanaël, I'm worried about you! At first, I thought that what you call "cubing" was a concept distinct from "trunk volume", which would explain your slightly unusual formula...
But upon checking this link, I saw that this is not the case, and that

The formula for cubing logs is that of a cylinder: V = (π x D² x L) / 4 or V= (C² x L) / (4 x π) where C or D = circumference or median diameter expressed in meters. L is the length of the log also expressed in meters. π = 3.1416
The other methods of calculating volume are illegal (for example: cubing at 1/4 or 1/5 deducted).

Therefore, your formula is incorrect because you divide by 4 twice instead of dividing once by 4 and once by 3.14.
The difference is quite significant, as the correct result is 1274 instead of the 1000 you found.
This rough approximation might be justified when performing a mental calculation in the middle of the forest for a first approximation, but it becomes illegal (more than 20% error) when you have a computer to perform the exact calculation =B2*B2/4/3.14
--
Retirement is great! Especially in the Antilles...
Raymond (INSA, AFPA)