Password Entropy Calculator
Calculate password entropy with length curve visualization
Enter Password
Entropy vs Length Curve
Entropy curve for your charset (1 chars)
Entropy Calculation
H = L * log2(N)
H=0.00 bits(Entropy)
L=0(Length)
N=1(Charset size)
log2(N)=0.00(Bits per character)
Security Level Comparison
EntropySecurity LevelEquivalent ToTime to Crack
< 28 bitsVery Weak4-char PINInstant
28-40 bitsWeak6-char lowercaseMinutes
40-60 bitsFair8-char mixedHours-Days
60-80 bitsStrong12-char mixedYears
80-100 bitsVery Strong16-char mixedCenturies
100+ bitsExcellent20+ char mixedHeat death
Recommendations
64+ bits for basic accounts
Email, social media, forums
80+ bits for important accounts
Banking, primary email
100+ bits for sensitive data
Encryption keys, master passwords
128+ bits for maximum security
Cryptographic applications
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