Security

Password Length Calculator

This tool calculates how password length and character set size affect the theoretical search space. Everything runs locally in the browser. Do not enter real passwords; only enter length and character set settings.

Calculate theoretical password combinations

Choose length, character set and an optional estimated checking speed. The output shows combinations, entropy and a purely theoretical search time.

Password length

Number of characters, not the password itself.

Checking speed

Custom guesses per second

Output type

Character set Lowercase a-z 26 Uppercase A-Z 26 Digits 0-9 10 Symbols 32 Remove ambiguous characters such as 0/O/I/l/1

Custom additional characters

Each unique character counts once. Example: äöüß€

Target entropy

Ready

Rating

0 bits

No calculation yet.

Key figures

Conversion and search space

Export output

For documentation, security notes or project handovers.

Important notes

The calculation only shows the mathematical search space. It does not check whether a real password is already known, reused, leaked or easy to guess because of patterns.

Longer passwords increase the search space especially strongly.
A larger character set helps, but it does not replace sufficient length.
For real accounts, random unique passwords and a password manager are useful.
Do not enter real secret passwords into this tool.