Password Entropy & Security Strength Evaluator

Calculate Shannon bit entropy, brute-force cracking time across GPU clusters, character pool space, and security vulnerability grade.

Configurable Calculation Inputs

Enter Password to Evaluate: text (Default: Tr0ub4dor&3#99)
Attacker Rig Speed: select (Default: 100b)

Mathematical Formula: Information Theoretic Password Entropy Formula

          E = L * log2(R) ; Crack Time = (R^L) / (Guesses per Second)
        

Where E is bit entropy, L is password length in characters, and R is the total size of the character pool (lowercase=26, uppercase=26, digits=10, symbols=33).

Comprehensive Guide & Context

Passphrases vs Arbitrary Short Symbols

A 20-character passphrase of 4 common dictionary words delivers ~52 bits of entropy while remaining memorable, avoiding the pitfall of sticky-note password writing.

Worked Calculation Examples

Mixed 14-Character Password

Tr0ub4dor&3#99 with uppercase, lowercase, numbers, and special characters.

Result: 91.8 Bits (Extremely Secure)

Frequently Asked Questions

Is my password sent to a server?

Never. CalcVerse evaluates password entropy 100% locally in your browser sandbox using pure client-side mathematical algorithms.