Password Entropy Calculator

Understand the mathematical strength of a password based on its length and character complexity.

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Password Length9

Character Sets Used

Lowercase LettersSize: 26 characters

Uppercase LettersSize: 26 characters

NumbersSize: 10 characters

SymbolsSize: 33 characters

Total Pool Size (N): 36 characters

Entropy Analysis

Calculated Entropy46.5 bits

Strength: Reasonable

This password has low entropy and is vulnerable to targeted guessing or brute-force attacks.

Total Combinations (Keyspace)101,559,956,668,416

How is this calculated?

Information entropy measures the unpredictability of a password. It is calculated using the formula:

E = L × log₂(N)

E = Entropy in bits
L = Length of the password (9)
N = Size of the character pool (36)

* This calculation assumes the password was generated completely at random. Predictable patterns or dictionary words significantly reduce actual real-world entropy.

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