An official transcript is a detailed summary of your all the semester's marks i.e. marks earned, grades per subject, credits per subject, etc provided by the university, hence proving the authenticity of the student. This transcript is provided by the university in a sealed envelope.
You do not need to convert your grades to 4.0 scale yourself because most the US universities evaluate your transcript and convert them to 4.0 scale themselves. Few universities may mention specifically for a WES(World Education Services) evaluation of your documents and for that you need to send your documents to WES for evaluation. It costs around $100-$200 depending on the type of evaluation you want.
If you want to get a brief estimation of your GPA, you can calculate it on various free GPA converters available online. Just google them.
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