How many pictures can an IPhone 16gb hold?

I have about 596 photos and I want to make sure I have enough room for about 200 more pictures for vacation. How many pictures can I can hold in my iPhone 16gb btw I only have about 72 songs. Please help give me a number of total pictures I can have

Insufficient data.

You haven't told us how many applications you have installed, or how much memory is taken up by "other stuff". Just check the free memory and get back to us.