Finance & Economics / Blockchain & Crypto
Mnemonic Entropy Calculator
BIP-39 standard mnemonic phrase lengths
BIP-39 Mnemonic Phrases
BIP-39 defines how to generate mnemonic sentences (seed phrases) from entropy. These phrases are used to back up cryptocurrency wallets.
How It Works:
- Generate random entropy (128-256 bits)
- Calculate checksum (SHA-256 hash)
- Divide into 11-bit segments
- Map each segment to a word from 2048-word dictionary
Formula:
Entropy Bits = (Words × 11) - (Words / 3)Checksum Bits = Words / 3Common Configurations:
- 12 words: 128-bit entropy (most common)
- 15 words: 160-bit entropy
- 18 words: 192-bit entropy
- 21 words: 224-bit entropy
- 24 words: 256-bit entropy (maximum security)
⚠️ Security Best Practices:
- Write down seed phrase on paper (never digital)
- Store in multiple secure locations
- Never share with anyone
- Verify word order is correct
- Use metal backup for fire/water resistance
- 12 words is sufficient for most users
- 24 words for maximum paranoia/security
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