The flicker noise of MOSFETs, a low frequency noise phenomenon is well known, and is a limiting factor in analog MOSFET circuit design, specially for low frequencies. Most standard simulators include this in their subroutines. However, even before using these subroutines, it behooves the engineer to know what to expect. i.e  which way the noise goes with variations in basic parameters of the MOSFET. In order to facilitate this Signal Processing Group Inc has released a Javascript calculator that is easy to use and provides reasonable results. It is based on a paper already released by SPG that can be found under the menu item ” Download white papers, articles and freeware” in the Signal Processing Group Inc. website. Interested readers can find these items there.