Password Entropy Calculator

Estimate password strength in bits of entropy.

Entropy (bits) 78.655

Possible combinations 4.7592031481425336e+23

Formula: entropy = length × log₂(character set size)

Step-by-step with your numbers:

1. Values used:

2. Password length = 12 chars

3. Character set size = 94

5. Entropy = 78.655bits

6. Possible combinations = 4.7592031481425336e+23

Did we solve your problem today?

Estimate how hard a password is to brute-force, measured in bits of entropy.

The math behind it

entropy = length × log₂(pool size). Each bit doubles the guesses needed. Aim for 60+ bits; 80+ is strong.

12 chars from all ASCII (94) → 12 × log₂(94) = 78.7 bits.

Length or complexity?

Length usually wins — adding characters increases entropy faster than expanding the character set.