Statistics & Probability

Instant, private, and free

Password Combination Calculator.

Calculate the number of possible strings from an explicit character-set size and length.

On-device calculationNo signup
01

Set your values

Results update as you type.

combinations: 475,920,314,814,253,360,000,000

combinations

475,920,314,814,253,360,000,000.000000
entropyBits: 78.655066

entropyBits

78.655066

Results update automatically as you type.

Use Cases

Assess password strength

Estimate how many possible passwords exist for a given length and character set, helping you understand how hard it is to guess.

Example: A 12-character password with 95 characters yields 95^12 ≈ 5.4e23 combinations.

Plan secure password policies

Use the calculator to decide minimum length and character variety requirements for systems or accounts.

Example: Set a policy requiring at least 10 characters with uppercase, lowercase, digits, and symbols.

Frequently Asked Questions

How does the password combination calculator work?
It computes the total number of possible passwords by raising the character-set size to the power of the password length. For example, with a character set of 26 and a length of 8, it calculates 26^8, giving the total combinations.
What is a character-set size?
It is the number of distinct characters you can use in a password. For instance, lowercase letters give 26, adding uppercase gives 52, digits add 10, and symbols add more. The calculator uses this number to determine the total possible combinations.
Why is password length more important than character-set size?
Because the number of combinations grows exponentially with length, while it grows polynomially with character-set size. For example, doubling the length squares the combinations, whereas doubling the character set only doubles them.

Tips & Common Mistakes

Tips

  • Use a longer password length to dramatically increase the number of combinations, as it grows exponentially.
  • Include a mix of character types (uppercase, lowercase, digits, symbols) to increase the character-set size.
  • For high-security accounts, aim for at least 12 characters and a character set of 90+ to make brute-force attacks impractical.
  • Remember that this calculator gives the total possible combinations, not the time to crack, which depends on the attacker's speed.

Common Mistakes to Avoid

  • Confusing the number of combinations with the time to crack; the calculator only provides the total count.
  • Using a character-set size that doesn't match the actual allowed characters, leading to an overestimate or underestimate.
  • Assuming that adding one character to the length has the same effect as adding one character to the set; length has a much larger impact.

Last updated: August 13, 2026