Hi Hal,
Welcome to the Q&A Board.
Your question is a very good one, and it is asked by everyone who buys a digital camera.
And, yep, we have a chart:
http://www.digicamhelp.com/learn/camera-questions-and-answers/memory-card-capacity.htmThe numbers are approximate, and you may get a few more or less shots. Even shots taken at, say, 5 MP/fine vary in file size due to variations in each scene. Also, a 5 mp photo shot in black and white mode, will have a considerably smaller file size than the same scene taken in color.