How to Calculate Password Strength

What is Password Strength?

A password entropy calculator measures the cryptographic strength of a password in bits: entropy = log₂(character set size^password length). A 12-character password using upper, lower, digits, and symbols has ~79 bits of entropy. At least 60–70 bits is generally recommended; password managers make using high-entropy passwords practical.

Step-by-Step Guide

1. 1Count character set size
2. 2Calculate combinations for length
3. 3Show bits of entropy

Worked Examples

Common Mistakes to Avoid

• ✕Not double-checking results
• ✕Ignoring edge cases

Frequently Asked Questions