Password Entropy Calculator
Calculate password entropy from length and character set.
How it works
Fill in the 2 fields above and Password Entropy Calculator calculates the result instantly, recalculating as you change any value. The math runs locally in your browser — nothing is sent to a server.
Examples
- Length 12 → Entropy: 78.7 bits
Frequently asked questions
How do I use the Password Entropy Calculator?
Enter your values in the 2 input fields and the result is calculated automatically as you type. Change any value to see the numbers update instantly.
Is my data private?
Yes. The Password Entropy Calculator runs entirely in your browser. Nothing you enter is uploaded, saved to a server, or shared — it never leaves your device.
Is the Password Entropy Calculator free?
Yes, it is completely free with no sign-up, no limits and no watermarks. Like every tool on security & privacy and the rest of the platform, you can use it as often as you like.
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