CSiRebar is an indispensable app that quickly and conveniently converts between combinations of bar sizes, steel area, and spacing requirements, allowing users to select the required combination of bar sizes and spacing for given conversions using ASTM, Metric or Imperial standards. Structural and civil engineers who need to view and select from various reinforcement layouts for a given criteria during member design, or who need to quickly get the area of steel provided in a given section during member analysis, will be impressed by its functionality. CSiRebar can generate many reinforcement layouts, including combined reinforcement layouts. It offers several bar options and can handle user-defined rules for bar selection and user-defined ranges. Users will find the graphic display of rebar layout options to be invaluable.