This is a small tool that I created to find combination of two resistors in either parallel or series, to match an expected value.
Simply enter the value required, can be float point values, can also have M K or k, or m units.
In this mode you can specify the vout and vref, it will try to pick a R2 value from range 8.0K to 30.0K, then use value match mode to find R1
This project is a Qt CMake project that you should be able to load from QtCreator with any modern Qt6 kit and compile for all platforms (Linux, Windows or Mac OS)