Password Strength Calculator

Strength – {{ strengthDescription || 'N/A' }}

Password:

Password properties

Password length: {{ length }} {{ lengthComment }}

Numbers: {{ digits }} {{ digitsComment }}

Letters: {{ letters }} {{ lettersComment }}

Uppercase letters: {{ upper }} {{ upperComment }}

Lowercase letters: {{ lower }} {{ lowerComment }}

Symbols: {{ symbols }} {{ symbolsComment }}

Charset size: {{ charsetSize }} {{ charsetComment }}

TOP-10000 password: {{ top10000 ? 'YES' : 'NO' }} {{ top10000Comment }}

Brute-force attack cracking time estimate

{{ row.machine }}: {{ row.time }}

Dictionary attack check

Your password is: {{ dictFlag ? 'Found in common dictionaries' : 'Not found in tested dictionaries' }}

Categories: Calculator , Security

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Password strength measures how hard it is to guess or crack a secret phrase. A strong password resists brute-force attacks and dictionary attacks because it uses many unique characters and avoids common words.

You use the Password Strength Calculator to inspect length, character variety, and dictionary presence. The tool returns a clear score, descriptive feedback, and estimated crack times for several attacker profiles.

With these insights, you quickly adjust weak areas, create longer phrases, and see the security impact in real time before using the password elsewhere.

No data is transmitted or stored server-side.

Technical Details:

The calculator analyses every keystroke locally and updates results instantly.

Entropy-based score ranges from 0 (Very Weak) to 4 (Strong).
Counts digits, uppercase, lowercase, and symbols separately.
Calculates effective character-set size to estimate possibilities.
Estimates crack time for six hardware profiles from desktop to botnet.
Checks input against a list of 10 000 common passwords.
Toggles plain-text view with an eye icon for quick review.
Embeds score and description in query parameters for sharing.
Processes everything offline after one optional dictionary download.

Parameter	Value for “Pa$$w0rd123”
Length (L)	11
Charset (C)	68 characters
Possibilities (C^L)	≈ 2.4 × 10²⁰
Score	3 (Fair)

Calculations and Scoring:

Four factors combine to produce the final strength score.

Formula Breakdown

`+1`	Password length ≥ 8 characters
`+1`	Contains both uppercase and lowercase letters
`+1`	Contains at least one digit
`+1`	Contains at least one symbol
`+1`	Length ≥ 14 and score ≥ 3

Worked Example

For “SecuRe#2025”, the calculator grants 5 points but caps at 4. Score = 4 (Strong); estimated crack time on a GPU ≈ 190 million years.

Interpretation

Scores 0-1 signal immediate change, 2 suggests improvements, 3 is acceptable for short-term use, and 4 is preferred for critical accounts.

Recommendations

Extend length beyond 14 characters.
Mix character classes evenly.
Avoid dictionary words and predictable patterns.
Regenerate unique passwords for different services.

Step-by-Step Guide:

Follow these actions to assess your password.

Navigate to the calculator page.
Enter or paste a password in the Password field.
Click the button to verify characters Tip.
Observe the coloured progress bar for an immediate strength description.
Review detailed metrics under Password properties.
Scroll to Brute-force attack cracking time and Dictionary attack check for deeper insight.

FAQ:

Find quick answers to common questions.

Is my password sent anywhere?

No. Everything runs in your browser. No data leaves your device.

What does the strength score represent?

A composite rating based on length, character variety, and symbol use, scaled from 0 to 4.

How accurate are crack-time estimates?

They use realistic guesses of attacker speed, but real-world times vary with hardware and technique.

Why check against common dictionaries?

Many breaches use known password lists. Avoiding these phrases greatly increases security.

Does the tool store any results?

No. Values vanish when you close the page or refresh it.