Password Entropy Calculator
Calculate password entropy, brute force time, and security strength. Measure password complexity and cryptographic strength.
Inputs
characters
Results
Password Entropy
78.7 bits
Brute Force Time
0 years
Equivalent Key Length
78.7 bits
Possible Passwords0
Password Entropy
78.7 bits
Brute Force Time
0 years
Equivalent Key Length
78.7 bits
How to Use This Calculator
- Start by filling in the input fields below. Results update instantly as you type, so you can experiment with different values to see how they affect the outcome.
- Password Length — Length of password Accepts values from 1 characters to 128 characters (default: 12 characters).
- Character Set Size — Number of possible characters (if not using checkboxes) Accepts values from 2 to 256 (default: 94).
- Uppercase Letters — Include A-Z Choose from: No, Yes. default: 1.
- Lowercase Letters — Include a-z Choose from: No, Yes. default: 1.
- Numbers — Include 0-9 Choose from: No, Yes. default: 1.
- Symbols — Include special characters Choose from: No, Yes. default: 1.
- Once all inputs are set, review your results in the Results panel. Here's what each output means:
- Password Entropy — shown as a numeric value. This is the primary result of this calculator.
- Brute Force Time — shown as a numeric value. This is the primary result of this calculator.
- Equivalent Key Length — shown as a numeric value. This is the primary result of this calculator.
- Possible Passwords — shown as a numeric value.
- Explore the related calculators below if you need deeper analysis or want to approach this topic from a different angle.
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Formula
Entropy = Length × log₂(Character Set Size)Related Calculators
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