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Password Entropy Calculator
Calculate password entropy and strength. Analyze your password security with crack time estimation and detailed entropy analysis.
🌍 International Security Compliance
⚠️ CRITICAL SECURITY NOTICE:
- This tool follows NIST SP 800-63B international standards
- Compliant with ISO/IEC 27001 security requirements
- Meets GDPR and HIPAA data protection standards
- All processing happens locally in your browser (zero data transmission)
- Password analysis uses industry-standard entropy calculations
Note: Weak passwords detected by this tool are flagged based on global security research and breach databases.
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About Password Entropy
Password entropy measures the unpredictability of a password. Higher entropy means the password is more secure and harder to crack through brute force attacks.
Entropy Formula:
E = log₂(C^L)
Where C = Character set size, L = Password length
Strength Levels:
- Very Weak: < 28 bits
- Weak: 28-35 bits
- Moderate: 36-59 bits
- Strong: 60-79 bits
- Very Strong: ≥ 80 bits