Password Entropy Calculator

Last updated: 2026-08-24

Password Entropy Calculator — Free online password entropy calculator. Enter length and symbol pool to get instant results.
Inputs
Result
Enter values and press Calculate

How to use it

  1. Calculate log₂ of the size of the pool
  2. Multiply per the length

Common mistakes

  • ⚠️ Not considering patterns predecibles
  • ⚠️ Asumir that more length siempre is best without aleatoriedad

Worked example

Contraseña 12 caracteres, pool 62 símbolos

Entropía in bits and fortaleza estimated

Input guide

FieldTypical range
lengthMínimo recommended: 12-16 caracteres
pool26 (minúsculas), 52 (mayús+minús), 62 (+numbers), 94 (+símbolos)