The NorCal Field Calculator gives Instrumentation and Controls professionals the ability to perform common field calculations directly from their iPhone. The application features an Analog Input Calculator which allows a user to determine expected values based on the relationship between analog electrical signals (4-20mA, 1-5V, etc.), Engineering Units (psi, ∞F, GPM, etc.) and PLC input units (digital counts). The application includes an Ohmís Law Calculator for determining the properties of simple electrical circuits, and a Unit Converter for transforming values in one unit of measure to another. The application runs directly from your iPhone without the need for a network connection. The NorCal Field Calculator eliminates the need to reference an HMI or calculator to verify field signals. The application saves field personnel time by putting the necessary tools right in the userís pocket.