What is the value of a Bundesrepublik Deutschland coin?

That inscription means "Federal Republic of Germany," so your coin is probably a standard circulation coin issued during the period 1950-1999. These coins were removed from circulation when the euro was adopted in 2002 and very few of them are worth any more than face value. You can get a rough idea of value in U.S. cents by doubling its denomination in pfennige, remembering that 1 Deutschmark = 100 pfennige.

However, without much more information - denomination, condition, and date, it's not possible to say.