Password Entropy Calculator
Entropy bits and crack time.
Enter your values
ⓘ Live results
Results
- Entropy
- 91.8 bits
- Time to crack
- 667497127 years
- Combinations
- 4.205e+27
- Rating
- Strong
Quick answer
Password entropy measures unpredictability in bits; each extra bit doubles the search space.
Entropy = length × log2(character set)
How to use the Password Entropy Calculator
- 1Enter the password length.
- 2Choose the character set used.
- 3Adjust attacker guess rate for your threat model.
Worked example
Using the values the calculator loads with:
Inputs
- Password length14
- Character setAll printable ASCII
- Guesses per second1e11
Results
- Entropy91.8 bits
- Time to crack667497127 years
- Combinations4.205e+27
- RatingStrong
Frequently asked questions
How many bits is enough?
80+ bits resists offline attacks for the foreseeable future.
Are passphrases better?
Yes — four random words beat a short complex password.
About this calculator
- Built and reviewed by James Whitfield · How we build and test calculators
- Report an error
Results are estimates for general information. For medical, legal, structural or financial decisions, confirm with a qualified professional.