Timcutting
timcutting.co.uk › tools › password-entropy
Password Entropy Calculator by Tim Cutting
Tim Cutting is a frontend web developer and UI designer. Based in Colchester, UK, he primarily works in JS, React, Wordpress.
Bitwarden
bitwarden.com › password-strength
Password Tester | Test Your Password Strength | Bitwarden
Bitwarden offers the most trusted password tester tool to ensure your password strength will protect your online information. Completely free and easy to use.
Videos
Password Entropy - Create Strong Passwords!
05:22
Password Entropy explained - YouTube
05:03
Calculating Your Password's Strength - YouTube
11:19
What is password entropy and why it really, really, matters - YouTube
10:04
Password Entropy Calculations - YouTube
Password Strength Checker in Python
How much entropy does my password have?
To find out how much entropy a password contains, follow these steps:
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Determine the length of your password — how many characters there are.
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Calculate the size of the pool of symbols from which you've taken the characters. For instance, if you only use lowercase letters, the pool size is 26. If you additionally use some digits, the pool size is already 36.
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Compute the entropy as password its length times the log of the pool size to base 2.
omnicalculator.com
omnicalculator.com › other › password-entropy
Password Entropy Calculator
How many bits of entropy for a good password?
For non-vital accounts, 25-30 bits of entropy are enough. For more important accounts, aim for 60-80 bits of entropy, up to 100 for crucial ones.
omnicalculator.com
omnicalculator.com › other › password-entropy
Password Entropy Calculator
When is a password secure?
A password is secure if it has at least 50 bits of entropy and does not appear in any list of leaked passwords.
omnicalculator.com
omnicalculator.com › other › password-entropy
Password Entropy Calculator
Omni Calculator
omnicalculator.com › other › password-entropy
Password Entropy Calculator
March 20, 2024 - This password entropy calculator can compute how strong your password is.
PasswordMonster
passwordmonster.com › home
Password Strength Meter
March 3, 2022 - How strong are your passwords? Test how secure they are using the My1Login Password Strength Test.
Alecmccutcheon
alecmccutcheon.github.io › Password-Entropy-Calculator
Password Entropy Calculator
Password Strength Tester : Calculates the entropy of a password
Dev Lateral
devlateral.com › home › tools › password entropy calculator
Password Entropy Calculator Tool | Dev Lateral
Find out how strong your passwords are with our free to use password entropy calculator. Strong entropy bits means more secure passwords.
Antivirus
antivirus.promo › password-strength-checker
Password strength checker. Test your password
Use this password strength checker to test your password. It shows real-time feedback and tips to create strong passwords. We calculate password complexity, entropy, brute force time, and check in blacklists.
Vercel
passwordslab.vercel.app
Password Strength Checker & Security Tester | Entropy Calculator & Crack Time Estimator
Analyze password strength with our security tool. Get real-time crack-time estimates, entropy scores, and risk evaluations. 100% secure, client-side processing. Improve protection with our password vulnerability tester.
Nickmccurdy
nickmccurdy.com › password-entropy
Password Entropy
You need to enable JavaScript to run this app
Rumkin
rumkin.com › tools › password › passchk.php
Strength Test
People wonder if their password is a good password. I often come across two distinct groups of people. The first would fall into a "just use any word" category, which is a very bad practice for picking passwords. The second group will mix in a few numbers in order to make the password a lot ...
Passwordentropycalculator
passwordentropycalculator.com
Free Online Password Entropy Calculator | Test Your Password Strength
Free online password entropy calculator. Analyze password strength, get real-time security feedback, and learn best practices for digital security.
Okta
okta.com › identity-101 › password-entropy
Password Entropy: The Value of Unpredictable Passwords | Okta
Password entropy is a measurement of difficulty. A hacker might try: Simple guesses. The hacker uses well-known passwords like “password” to unlock access. Brute force. The hacker uses a program that submits dozens of guesses every minute based on mathematical probabilities. Research. The hacker digs through your social media accounts and online presence to find out your street address, pet’s name, and other common data points used in passwords.
Insecure Lab
insecure.in › tools › password-entropy-calculator
Password Entropy Calculator | Insecure Lab
April 12, 2025 - Try this password entropy calculator to check the strength of your password. Learn about password entropy, calculation method, and benefits in cybersecurity.
Zelvin Security
zelvin.com › home › password entropy calculator
Password Entropy Calculator
March 14, 2025 - In general, the more characters a password has and the more diverse the set of characters it includes, the higher its entropy will be.
Reddit
reddit.com › r/cryptography › question about password entropy calculators
r/cryptography on Reddit: Question about password entropy calculators
January 12, 2023 -
Hi, is anyone able to explain/opine why Cygnius Password Strength Test is giving such wildly different (i.e., much, much lower) entropy scores vs Password Entropy Calculator (omnicalculator.com) or Password Entropy Calculator by Tim Cutting - Web Developer, Colchester ?
Top answer 1 of 4
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The dice is not the roll. You are literally telling these calculators "I rolled a 17" and asking them "How many sides does my die have?". It could be 20. It could be 100. It could be just a coin with 17 painted on one side and 5 painted on the other. Entropy is a measure of the dice. Entropy is a well-defined, mathematical concept that applies to probability distributions, not outcomes. Not. Outcomes. If you observe an outcome and were forced to estimate the entropy of the distribution, this gets into astrology territory. There are reasonable, well-meaning heuristics for doing so, but all of it is arbitrary on how the authors wants to define it. Depending on how your calculator wants to weigh certain features, you get different answers. This is because, as stated above, entropy calculators only see the roll, and therefore are always just a "guess". You can build different ways of guessing, that's why you get different results. Authors of these calculators don't always understand entropy themselves and it causes a spread of false understanding of entropy. Don't fall for it.
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there is no clear definition of entropy. consider my password for example: JuliaAnna1954 if you try lower+uppercase+numbers, it is okay strong. but if you also include names, dates as elements, suddenly it is very weak. entropy calculators use different kinds of attacks, and the dumber ones will give you a higher score.
Password Generator
generatepasswords.org › how-to-calculate-entropy
How to Calculate Password Entropy? - Password Generator
June 10, 2019 - The following table illustrates some examples of entropy calculations of passwords of varying strength: However, this formula would only apply to the simplest of cases. Many online password meters and registration forms complicate matters by imposing various arbitrary (and unfortunately non-random) ...
Pleacher
pleacher.com › mp › mlessons › algebra › entropy.html
Password Entropy
Password entropy is a measurement of how unpredictable a password is. The formula for entropy is: E stands for "entropy," which is the opposite of an ordered pattern. Entropy is good: the bigger the E, the harder a password is to crack · We calculate password entropy by first looking at the ...
CatsWhoCode
catswhocode.com › password strength tester: check your password security
Password Strength Tester: Check Your Password Security
January 21, 2025 - The tool processes passwords locally within the browser, calculating entropy bits, analyzing character diversity, and identifying potential vulnerabilities. The password strength meter features a user-friendly interface with visual progress indicators and detailed security metrics for easy ...
Baeldung
baeldung.com › home › security › how to determine the entropy of a password?
How to Determine the Entropy of a Password? | Baeldung on Computer Science
March 18, 2024 - Now let’s take an example password and calculate the entropy score. Specifically, we’re taking a 10-digit long password that contains uppercase, lowercase, and numbers: Better2023. Here, the password length L = 10. As the password contains uppercase, lowercase, and numbers, the rage of the characters R = 26 + 26 + 10 = 62.
NordVPN
nordvpn.com › blog › what-is-password-entropy
Password entropy and how to calculate it | NordVPN
September 2, 2025 - Sometimes hackers leak these lists of compromised passwords on the Dark Web. You can use specialized tools like NordVPN’s Dark Web Monitor to make sure your credentials have not been exposed online and to get informed if they are in danger. High entropy passwords are much less susceptible to hacking attempts involving other password-cracking techniques, such as a rainbow table.