Systems, methods and machine-readable mediums for defining and executing new commands in a spreadsheet application are provided. A method may include receiving a declaration command in a first spreadsheet cell. The declaration command identifying a command name for the new command and operations performed for the command name based on a plurality of second spreadsheet cells. A system may include a processor programmed to evaluate the declaration command in the first spreadsheet cell according to the instructions stored in a storage device, receive the command name and at least two parameters identifying at least one input spreadsheet cell and at least one output spreadsheet cell of the spreadsheet application, create a new command for the spreadsheet application, and evaluate the new command as identified by the command name in a second spreadsheet cell for execution. The computer readable mediums provide instructions to cause the processor to perform the operations above.