Password Combination Calculator
Enter your password length and which character types it uses to see the total possible combinations, entropy in bits, and an estimated brute-force crack time.
What this calculator does
This calculator estimates how many possible combinations a password could take based on its length and which types of characters it uses, along with a rough estimate of how long a brute-force attack would take to guess it.
How the calculation works
The total number of possible combinations is the character set size raised to the power of the password length: combinations = (character set size)^length. The character set size adds up the number of options for each type included: 26 for lowercase letters, 26 for uppercase letters, 10 for digits, and roughly 32 for common symbols. Entropy in bits is calculated as length x log2(character set size), a standard measure of password strength — more bits means exponentially more combinations to search.
The estimated crack time simply divides the total combinations by an assumed number of guesses per second an attacker could attempt, converted into years. Real-world crack times vary enormously based on the actual attack method, hashing algorithm, and hardware used, so treat this as a rough, general educational estimate rather than a precise security guarantee.