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That's a tough one. The only accurate method of determining compression ratio is hind-sight ;) First of all, there's many types of compression. Even within a specific type, it's difficult to predict the precise amount of compression. Generally, compression tokenizes repeating byte sequences - the more repetition, the higher the compression ratio. For example, if you were to make movie that had nothing but a white screen, you could probably make several hours of this movie, then compress it down to fit on a floppy disc. On the other hand, if you were to film an overly impressive fireworks display, you might soon run out of memory. There's 2 general categories for compression: loss (usually low-loss) and loss-less. While the loss type reduces presentation quality, loss-less does not. Compression techniques such as MP3 uses a blend of both. This allows you temper size with quality to attain an acceptable result. So, pick one, and after a while, you'll get a feel for how much compression to expect.

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