How do I know how many cells X and Y have on a spritesheet?

Hi all,

I've having trouble using free tiles and graphics.

For example, I would like the following picture able to use as sprites but every amount of horizontal and vertical cells i've guessed was wrong and made the sprites unusable. How can I find out the correct values I have to input?

Sprites I want to use:

http://i65.tinypic.com/2pedd.png

Thank you in advance.

Without foreknowledge you have to guess its tile size.

The formula is image size/ tile size = number of tiles for w, and h.

128/4 etc.

Aha!! 22x18.

Thanks a lot Newt!