Calculadora de Combinações de Senhas

The Password Combinations Calculator determines the total number of possible passwords based on alphabet size and password length. The calculation follows the formula combinations = alphabet^length, where the alphabet represents the number of available characters (e.g., uppercase and lowercase letters, numbers, symbols). The larger the alphabet and length, the more combinations and, consequently, the greater the password security.

The tool also calculates password entropy in bits using the formula entropy = log₂(combinations). Entropy measures password unpredictability: values above 60 bits are considered strong against brute-force attacks. For example, an 8-character password with uppercase and lowercase letters (52 characters) yields 52^8 combinations, equivalent to approximately 45.6 bits of entropy.

Use this calculator when creating or evaluating passwords for online accounts, systems, or devices. It helps compare different setups: increasing password length has a greater impact on security than just adding special characters. For instance, a 12-character password with lowercase letters (26^12) has more combinations than an 8-character password with all types (95^8).

Caution: the calculator assumes that each character can be used repeatedly and that there are no additional restrictions, such as disallowing repeated characters or requiring at least one number. In practice, many passwords must meet specific criteria, which reduces the combination space. Also, overly complex passwords can be hard to remember, requiring the use of password managers.