Password Entropy Calculator
Guide: how to use
Step-by-step instructions in the blog
No tools found. Try another keyword.
Password Entropy Calculator
Measure the mathematical strength of your passwords using bit entropy to determine how resistant they are to brute-force attacks.
Lowercase Letters
Uppercase Letters
Numbers
Symbols
Password Entropy
bits
Estimated Time to Crack
Estimated time using a generic high-speed cracking rig (10B guesses/sec).
Results Locked
Enter a password and click Analyze to calculate entropy and cracking time estimates.
The Password Entropy Calculator is a professional-grade security utility designed to quantify the mathematical resilience of your credentials using information theory. Unlike basic strength meters, this tool calculates the exact "bits of entropy"—a measure of the number of possible combinations an attacker must guess to compromise your password. By analyzing the diversity of your character pool (lowercase, uppercase, numbers, and symbols) in relation to password length, it provides a precise estimation of brute-force vulnerability. Whether you are securing a server, a personal account, or developing a security policy, this tool offers the technical insights needed to stay ahead of modern cracking techniques. All calculations are performed instantly in your browser, ensuring your sensitive passwords never leave your machine.
Related Tools
