Password Strength & Entropy Calculator
Estimate password entropy in bits and brute-force cracking time (calculated locally, never transmitted).
How to use the Password Strength & Entropy Calculator
- Enter or select: Password, Attacker speed.
- The results (Length, Character pool size, Entropy, Average crack time, Rating) are calculated instantly as you type.
- Use βCopy linkβ to share the calculation with the same input values.
Formula
- H = L Β· logβ(N)
About this tool
Assumes random characters; dictionary words and patterns are weaker than the estimate.