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Password Strength Calculator

Estimate password entropy from its length and character set.

Password length

characters

Character set

How it works

Entropy = length × log2(size of character set). It assumes every character is chosen at random. Real passwords made of words or patterns are weaker than the number suggests. Use a password manager and longer random passwords.

FAQ

Is this calculator free?

Yes. No signup is needed and nothing you enter is stored.

Is the result exact?

Results are rounded for display. For financial, medical, or legal decisions, confirm with a professional.

Do my numbers leave my device?

No. The calculation runs in your browser.