Entropy Calculator

Entropy Calculator:

• Measures randomness using Shannon entropy formula
• Higher entropy indicates more randomness and strength
• Analyzes character set diversity and distribution
• Provides password strength recommendations

Formula: H = -Σ(p_i × log₂(p_i))

Where p_i = probability of character i appearing

Strength Guidelines:

• <20 bits: Very Weak (avoid)
• 20-40 bits: Weak (improve)
• 40-60 bits: Fair (acceptable)
• 60-80 bits: Good (recommended)
• >80 bits: Very Strong (excellent)

Character Sets:

• Digits: 3.3 bits/char
• Letters: 4.7 bits/char
• Alphanumeric: 5.7 bits/char
• ASCII: 6.5 bits/char
• Unicode: 16 bits/char