Password entropy estimate
Mistake: Treating a result as valid outside the described scope.
Fix: Assess password patterns locally; the 0–4 score and theoretical entropy are not security guarantees.
Archive · Free
Password entropy estimate
Estimate theoretical entropy from the character pool. Assumes random selection; does not measure real password security.
This tool is archived. Recheck its method and dated data before use.
01Enter your values
Runs in your browserRuns offline in your browser. Once the page and required files have loaded, processing needs no internet.
02Password entropy estimate
Runs in your browser
How it works
Estimate theoretical entropy from the character pool. Assumes random selection; does not measure real password security.
H = n × log₂(R)
Runs in your browser
Discovery source
Your data stays yours
Inputs are processed on this page and are never sent to a server.
About this tool
Use tool ↑Estimate theoretical entropy from the character pool. Assumes random selection; does not measure real password security.
Assess password patterns locally; the 0–4 score and theoretical entropy are not security guarantees.
- Enter your values
- Password
- Calculation method
H = length × log₂(pool)
- Example scenario · Result
111.68754534 bits
Calculation method
- Assess password patterns locally; the 0–4 score and theoretical entropy are not security guarantees.
H = length × log₂(pool)
Password entropy estimate
- Password
- Excluded from report
Theoretical upper bound
111.68754534 bits
Frequently asked questions
How should I interpret the result?
Assess password patterns locally; the 0–4 score and theoretical entropy are not security guarantees.
Where does my data go?
Calculations run on your device. Form inputs are not sent to a server.
Terms and definitions
Enter your values
- Password
Assess password patterns locally; the 0–4 score and theoretical entropy are not security guarantees.
Enter the source text; it is processed locally.
Result
- Result
Assess password patterns locally; the 0–4 score and theoretical entropy are not security guarantees.
Calculated from your entries using the method below.
- Theoretical upper bound
Assess password patterns locally; the 0–4 score and theoretical entropy are not security guarantees.
Calculated from your entries using the method below.
- Estimated strength
Assess password patterns locally; the 0–4 score and theoretical entropy are not security guarantees.
Calculated from your entries using the method below.
Common mistakes and quick fixes
Limits and key assumptions
- Assess password patterns locally; the 0–4 score and theoretical entropy are not security guarantees.