MEASURE YOUR FAVOURITE TREE
with easy calc
Result:

ZDNet (c) 1999.
To measure the diameter of a tree,(tip.use centimetres) first you need to measure the tree's circumference at chest height, then enter the measurement into the calculator and divide by Pi = .this will give you the recognized diameter of your tree.
best of luck
please E.mail me if you have any comments. kencollinson@beeb.net