Work out keyspace size instantly with clear inputs, formula shown and shareable results.
Keyspace is the count of distinct values a secret can take: C^L for a string of length L over an alphabet of size C. Expressed in bits, entropy is L x log2(C), which is the number to compare against key lengths — a 12-character alphanumeric password carries about 71 bits, noticeably weaker than a 128-bit AES key.
Keyspace and entropy
keyspace = C^L; entropy bits = L x log2(C)
Bits let you compare secrets of different alphabets directly and map them onto cryptographic key strength, where each extra bit doubles the search effort.
Going from 62 to 95 characters adds only about 0.62 bits per character. Adding two more characters of length usually beats adding symbol complexity, and is easier to remember.