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Statistics Calculators

Password Combination Calculator

Calculate the total number of possible passwords given a character pool size and password length.

e.g. 26 lowercase letters, 52 upper + lower, 62 alphanumeric, 95 all printable ASCII characters.
Total possible passwords —
Total (scientific notation) —
Entropy —
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About the Password Combination Calculator

Every extra character in a password's allowed character set, and every extra character of length, multiplies the number of possible passwords an attacker would have to try to guess it by brute force.

Formula: Total Combinations = Pool Size ^ Length · Entropy (bits) = Length × log₂(Pool Size)

Entropy measures the same idea in bits: each additional bit doubles the number of possible passwords. This calculator shows just how quickly the space of possibilities explodes as you lengthen a password or widen its character set — distinct from password strength scoring, which also weighs predictability.

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