Password Entropy Calculator
Calculate password entropy, brute force time, and security strength. Measure password complexity and cryptographic strength.
Inputs
characters
Results
Password Entropy
78.7 bits
Brute Force Time
0 years
Equivalent Key Length
78.7 bits
Possible Passwords0
How to Use This Calculator
- Set the password length in characters.
- Select the character types used: uppercase, lowercase, numbers, and/or symbols.
- Review password entropy in bits -- aim for 72+ bits for most accounts, 120+ for high-security.
- Check the equivalent brute-force time in years at modern cracking speeds.
- Use these benchmarks to set minimum password requirements in your security policy.
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Formula
Entropy = Length × log₂(Character Set Size)Related Calculators
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