This brief revisits the problem of conversion between number systems and asks the following question: given a nonnegative decimal number , what is the value of the digit at position in the corresponding base number? Thus, we do not require the knowledge of other digits except the one we are interested in. Accordingly, we present a conversion function that relates each digit in a base system to the decimal value that is equal to the base number in question. We also show some applications of this new algorithm in the areas of parallel computing and cryptography.