In addition to those parts of Europe where German is an official language, teaching of the German language as well as German-speaking minorities are present in many countries on all six inhabited continents.
Mostly depending on the inclusion or exclusion of certain varieties with a disputed status as separate languages (e.g., Low German/Plautdietsch,), it is estimated that approximately 90–95 million people speak German as a first language, 10-25 million as a second language, and 75–100 million as a foreign language. This would imply approximately 175-220 million German speakers worldwide.
In the Early Modern period, German varieties were a lingua franca of Central, Eastern and Northern Europe (Hanseatic League).
Today, German, like French, is a common second foreign language in the western world, as English (Spanish in the US) is well established as first foreign language. German ranks second (after English) among the best known foreign languages in the EU (on par with French) as well as in Russia. In terms of student numbers across all levels of education, German ranks third in the EU (after English and French) as well as in the United States (after Spanish and French). In 2015, approximately 15.4 million people were in the process of learning German across all levels of education worldwide. As this number remained relatively stable since 2005 (± 1 million), roughly 75–100 million people able to communicate in German as foreign language can be inferred assuming an average course duration of three years and other estimated parameters. According to a 2012 survey, ca. 47 million people within the EU (i.e., up to two thirds of the 75-100 million worldwide) claimed to have sufficient German skills to have a conversation. Within the EU, and not counting countries where it is a (co-)official language, German as a foreign language is most widely taught in Eastern and Northern Europe, namely the Czech Republic, Croatia, Denmark, the Netherlands, Slovakia, Slovenia, Sweden and Poland.