> For the complete documentation index, see [llms.txt](https://help.modelreef.io/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://help.modelreef.io/syntax/formula-syntax.md).

# 🧱 Formula Syntax

- [Formula Editor Layout](https://help.modelreef.io/syntax/formula-syntax/formula-editor-layout.md)
- [Allowed Operators](https://help.modelreef.io/syntax/formula-syntax/allowed-operators.md)
- [Selecting Variables in Sidebar](https://help.modelreef.io/syntax/formula-syntax/selecting-variables-in-sidebar.md)
- [Selecting Drivers in Sidebar](https://help.modelreef.io/syntax/formula-syntax/selecting-drivers-in-sidebar.md)
- [Autocomplete Behaviour](https://help.modelreef.io/syntax/formula-syntax/autocomplete-behaviour.md)
- [Formula Validation Errors](https://help.modelreef.io/syntax/formula-syntax/formula-validation-errors.md)
- [Vectorised Calculations](https://help.modelreef.io/syntax/formula-syntax/vectorised-calculations.md)
- [Formula Output Preview](https://help.modelreef.io/syntax/formula-syntax/formula-output-preview.md)