B1

A B1 level of English would be sufficient for interactions with English speakers on familiar topics. In the workplace, people at a B1 level of English are able to read simple reports on familiar topics and write simple e-mails on subjects in their field. However, a B1 level is not adequate to function fully in the workplace in English.
According to the official guidelines, someone at the B1 level in English:

1. Can understand the main points of clear standard input on familiar matters regularly encountered in work, school, leisure, etc.
2. Can deal with most situations likely to arise whilst traveling
3. Can produce simple connected text on topics that are familiar or of personal interest.
4. Can describe experiences and events, dreams, hopes, and ambitions and briefly give reasons and explanations for opinions and plans.

English level B1 is the third level of English in the Common European Framework of Reference (CEFR), a definition of different language levels written by the Council of Europe. In everyday speech, this level would be called “intermediate”, and indeed, that is the official level descriptor in the CEFR. At this level, students are beyond the basics but they are still not able to work or study exclusively in English.