> For the complete documentation index, see [llms.txt](https://docs.enercalc.com/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.enercalc.com/efr-user-manual/working-with-calculations/changing-section-sizes.md). # Changing Section Sizes How to change beam and column section sizes in ENERCALC and push the updated size back to the Revit model. Once a calculation has been sent from Revit and has loaded in the ENERCALC interface, a number of different calculation types permit the user to select a new section size. This includes both beam and column calculations which rely on standardized section types, including AISC steel sections and NDS wood sections. Design types that use open-ended arbitrary geometry (such as concrete beams or columns) share some similarities but will not behave identically. Refer to the appropriate sections for specific calculation types for more detail. Once a calculation has loaded in the ENERCALC interface, the section size is available for modification by the user using the same controls typically seen in a conventional manually built calculation. ![](https://4249100372-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2FgHVzpA9PT0VcuNGp6j39%2Fuploads%2Fgit-blob-059234eb35baa36604758e354c8cf88282c63f03%2Fclip0815.png?alt=media) As with a conventional manually-built ENERCALC calculation, the calculations and code checks for the design will update in real time when the section size is changed: ![](https://4249100372-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2FgHVzpA9PT0VcuNGp6j39%2Fuploads%2Fgit-blob-75a4fc42a463a317bbd72f4e170e2cc4a740ea7c%2Fclip0816.png?alt=media) When the user completes the design and clicks "Save and Close", any changes to the section size will be automatically applied to the corresponding physical element in the Revit model. As long as the appropriate section already exists in the Revit project OR EFR can successfully locate and load the appropriate family ("`.rfa`") file, then the element will seamlessly and instantaneously toggle to the new section size. If this process occurs without any errors or warnings, then the section size update will not be accompanied by any pop-ups or notifications. If any issues occur while obtaining the loadable content or updating the section, the user will be notified accordingly. Typical issues associated with this process are detailed in [Size Change Errors](/efr-user-manual/working-with-calculations/changing-section-sizes/section-change-warnings.md). --- # Agent Instructions This documentation is published with GitBook. GitBook is the documentation platform designed so that both humans and AI agents can read, navigate, and reason over technical content effectively. Learn more at gitbook.com. ## Querying This Documentation If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question. Perform an HTTP GET request on the current page URL with the `ask` query parameter, and the optional `goal` query parameter: ``` GET https://docs.enercalc.com/efr-user-manual/working-with-calculations/changing-section-sizes.md?ask=&goal= ``` `ask` is the immediate question: it should be specific, self-contained, and written in natural language. `goal` is optional and describes the broader end goal you are ultimately trying to accomplish on behalf of the user. GitBook uses it to tailor the answer towards what is most useful for that goal. The response will contain a direct answer to the question and relevant excerpts and sources from the documentation. Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.