Finding the centre point of a piece of wood?

[daveuk2009]

Hi all just a question
Hi how do you find a cente point of a piece of wood.
so that the left and right side are the same
I am fixing handles to a door on my fishtank stand and i want to get it spot on

 

[kevindgas]

draw 2 diagonal lines from opposite corners center is where both lines cross

 

[Jasonb]

Measure the length and divide by two

 

[foxhole]

It will be right in the middle.