Lens Camera Lens

Lens Camera Lens
How can I check and see what size my Camera Lens is?

I need to know what size my camera lens is so that way I can buy another lens for it. I cannot decide whether it is a 55mm or a 58mm. My camera model is Canon Rebel XTi EOS Dslr Camera. Please help!!
Where can I find the size of the lens?(i.e. on the camera or on the lens that I am currently using?)

It should say directly on the lens what size the lens is and then what size the filter measurement is too. Good luck

Nokia N97 Main Camera Lens Cover Removal & Replacement