The PCB Conductor Spacing and Voltage Calculator calculates the minimum spacing between two conductors if the potential difference between them is provided. Conversely, if the spacing between two conductors is given then the maximum potential difference that can be allowed between them is computed.
With this tool, you can get an accurate estimate of the space and voltage required between the conductors. This is particularly helpful during the PCB design and layout stages. The calculator is largely based on IPC 2221B standard, table 6-1.