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Password Entropy Calculator

Audit & Analysis • 100% Client-Side Processing

Mathematical password entropy calculator. Computes exact pool size (uppercase, lowercase, numbers, symbols) and total entropy bits: E = L * log2(R).

Privacy First: Password Entropy Calculator executes 100% locally in your web browser. No inputs or generated outputs leave your device.
Entropy Score
0 bits
Character Pool Size
0
Strength Rating
Brute Force Crack Time
0s

Tool Chaining — Continue Workflow

Take your result from Password Entropy Calculator directly into companion utilities:

Password Strength & Entropy AuditorBrute-Force Password Crack Time Estimator

How to Use

  1. Enter password.
  2. View Pool Size (R), Length (L), and Total Entropy (Bits).

Key Features

  • •Mathematical transparency
  • •Pool size breakdown
  • •Evaluates NIST 800-63 guidelines

Technical Scope & Limitations

  • • Assumes random selection; dictionary words have lower effective entropy.