Overclocking Calculator calculates CPU speeds, PCI bus speed, and the AGP bus speed based on the information it is given to work with.

For instance, if your FSB (Front Side Bus) is set to
100 mhz, and your CPU multiplier is set to 8, your CPU will be running at 800 mhz. It will also tell you what your PCI bus speed will be if you set the PCI multiplier to 1/2, 1/3, 1/4 or any other setting at any range of bus speeds. It will also give you the same type of information for the AGP bus.

Most setting can be added or removed through the Settings options.

In short, its basically a single function calulator :)