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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.

Guide étape par étape

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

Exemples résolus

Erreurs courantes à éviter

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

Questions fréquentes