STOKE ON TRENT, UK - PCB design bureau Black Stick Ltd. has a free software tool called the C4Calculator. The tool calculates current capacity for a given PCB track width and thickness. Black Stick’s C4Calculator (Current Carrying Capacity Calculator) utility determines the optimum current based on a given interconnect width and thickness. In addition, C4Calculator will also calculate the gap needed between conductors for a given voltage peak. All the calculations within the tool are taken from formulae or tables specified in the IPC-2222A standard. C4Calculator also allows users to perform calculations beyond the scope of the IPC standard.