Generators Cheat Sheet

Password Strength & Entropy Cheat Sheet

Published September 8, 2026

How password strength scales with length and character set. For the full explanation, see What Makes a Password Strong?.

Password Type Approximate Combinations
8 characters, lowercase only 26⁸ ≈ 2.09 × 10²¹¹
8 characters, mixed (upper, lower, digit, symbol) 94⁸ ≈ 6.09 × 10¹⁵
12 characters, mixed 94¹² ≈ 4.75 × 10²³
4-word random passphrase 7,776⁴ ≈ 3.66 × 10¹⁵

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Frequently Asked Questions

What makes a password “strong”?

Length matters more than complexity rules. A longer password drawn from a large character set is exponentially harder to brute-force than a short, complex one.

Is a passphrase better than a random password?

A sufficiently long passphrase (four or more random words) can match or exceed the strength of a shorter complex password, while being much easier to remember.

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