Gnumeric has the ability to import and export data in several file formats, including CSV, Microsoft Excel (write support for the more recent .xlsx format is incomplete), Microsoft Works spreadsheets (*.wks), HTML, LaTeX, Lotus 1-2-3, OpenDocument and Quattro Pro; its native format is the "Gnumeric file format" (.gnm or .gnumeric), an XML file compressed with gzip.
Include tutte le funzioni di foglio di calcolo dell'edizione nordamericana di Microsoft Excel, a cui se ne aggiungono altre.