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Password Entropy Calculator
Estimate password entropy from length and character set size.
Calculate entropy
104.9 bits
Extremely difficult with current commodity hardware.
How it works
- Entropy is calculated as length multiplied by log2 of the character set size.
- A custom charset overrides the numeric charset size.
- The difficulty label provides practical guidance.
FAQ
Is entropy the same as real-world strength?
No. Reused or predictable passwords can be weaker than the estimate.
What entropy is good?
80 bits or more is a strong target for many offline attack scenarios.