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TechnologyGenerated accuracy model review: 2026-05-06
Password Entropy Calculator accuracy and testing
This page documents how Calwarden builds trust for this calculator: source notes, regression-style default tests, limitations, assumptions, unit handling, rounding, and visible change history.
Formula source
- Entropy bits = length * log2(character pool). Average guesses = 2^(entropy - 1). Average crack time = average guesses / guesses per second.
Test cases
Default input regression check
Generated from the checked-in default inputs and calculate function.
Inputs
- Password Length: 16
- Lowercase letters: Yes
- Uppercase letters: Yes
- Numbers: Yes
- Symbols: Yes
- Guesses per Second: 1,000,000,000
Expected outputs
- Estimated Entropy: 104.87 bits
- Character Pool: 94 chars
- Average Crack Time: ~1e15 years
- Average Guesses: ~1e31
Known limitations
- This page documents the checked-in calculator logic and does not certify results for every real-world edge case.
- Use the result as a planning estimate unless the calculator page states a stricter purpose.
Assumptions
- Characters are assumed to be chosen uniformly at random from the selected pool.
- This calculator does not check breached password lists or user-specific patterns.
- No actual password is required or stored; calculations run locally.
Unit handling
- Password Length accepts numeric values.
- Lowercase letters accepts Yes/No values.
- Uppercase letters accepts Yes/No values.
- Numbers accepts Yes/No values.
- Symbols accepts Yes/No values.
- Guesses per Second accepts numeric values.
- Estimated Entropy is displayed in bits.
- Character Pool is displayed in chars.
Rounding rules
- Number displays use up to 2 decimal places in the calculator UI.
- Input precision follows configured step values where provided.
Version history
1.0.0 - 2026-05-06
Generated accuracy and testing page from the current password-entropy-calculator calculator definition.
Change log
2026-05-06
Published default regression test documentation and metadata fallbacks for Password Entropy Calculator.
Calculator transparency
Accuracy pages are generated from checked-in calculator definitions and can be upgraded with curated review metadata over time.