Instrumentation engineering calculation software for orifice plates, flow nozzles, venturi tubes and restriction orifice. Calculation are based on ISO 5167-1, ASME MFC-3M, AGA-3 (ANSI/API 2530 Chap. 14 sec. 3) and ASME MFC-14M Standards. The software can calculate the size of Orifice Plates, Flow Nozzles, Venturi Tubes and Restriction Orifice for Liquid, Gas/Vapor and Steam Flow Rate. Saving, Printing and Units Converter are not included on DG2FloCal Lite version. Version 2.0 includes: AGA-3 (ANSI/API 2530 Chap. 14 sec. 3) and General Standard is added for Square-Edged Oriface Plates with Flanged, Corner and Radius Taps.