Am I calculating U-value correctly?

[goatcat]

Here is my Excel template, it comes with no guarantees but hopefully, it can be of some use

 

[Aron Roger]

https://www.rockwool.com/se/downloads-tools/berakningsprogram/energiberakning/

https://www.isover.se/berakningsprogram/u-vardesberaknaren

Two good free alternatives where you can easily calculate u-values for various building components