Security Tools
Password Entropy Calculator
Estimate theoretical password entropy locally in your browser.
0Estimated bits
0Character pool
Very lowRating
Enter a password to estimate theoretical entropy.
Calculated locally. This is a theoretical estimate, not a breach check.
Entropy estimate
The estimate uses length × log2(character pool size) based on the character classes present in the password.
Real-world strength differs
Human-generated passwords often contain patterns and reused words, so actual resistance to guessing may be lower than the theoretical value.