// multi-utility computation suite · offline · instant · precise
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│ computation suite │
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tool.password-entropy Calculator
Calculates password strength in bits of entropy from character set size and length, and estimates crack time at modern GPU hash rates. 60 bits of entropy resists online attacks indefinitely; 80+ bits resists offline GPU cracking for decades.
Inputs
Length
Linear measurement. Ensure consistent units: 1 m = 1,000 mm = 3.281 ft.
Charset
Reference formula or conversion factor shown for context.
Guesses Per Sec
Reference formula or conversion factor shown for context.
Strength Target
Measure of disorder in the system (J/mol·K). Spontaneous processes tend to increase entropy (Second Law of Thermodynamics).
Results
entropy (bits)
Sample size or count used in the calculation.
crack time (years)
The computed duration or time value.
strength
Sample size or count used in the calculation.
combinations
The value at the specified point or condition.
add 1 char benefit
Sample size or count used in the calculation.
NIST recommendation
Suggested action or value based on the computed results and applicable best-practice guidelines.