Praktické

Kalkulačka generování hesel

Generátor hesel

Length

Character Types

LowercaseUppercaseNumbersSymbols

What is Password Generator Calculator?

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Generátor hesel vytváří kryptograficky náhodná hesla zadané délky a znakové sady a vypočítává entropii (sílu) vygenerovaného hesla.

Calkulon makes complex calculations simple — built for students and everyday problem-solvers.

Vzorec

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f(x)Entropie = L × log₂(N) bitů

Variable Legend

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Symbol	Jméno	Jednotka	Popis
L	password length; N = character set size	—	password length; N = character set size
N	character set size	—	character set size

How to Password Generator Calculator

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1Entropy = L × log₂(N) bits
2L = password length; N = character set size
370+ bits is considered secure for most uses
4Longer is always stronger — prefer 16+ characters

Worked Examples

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Example 1

Given:16 characters, all printable ASCII (95 chars)

Výsledek:Entropy = 16 × log₂(95) = 104.9 bits — very strong

Real-World Applications

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Secondary and university physics/chemistry coursework

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Laboratory calculations and experimental data analysis

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Engineering design and materials science applications

Password Strength Guide

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Entropy (bits)	Strength	Time to crack (brute force)
< 40	Very weak	Seconds to minutes
40–55	Weak	Hours to days
56–70	Fair	Years
70–90	Strong	Thousands of years
> 90	Very strong	Longer than the universe

Frequently Asked Questions

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What is Random Password?

A password generator creates cryptographically random passwords of specified length and character set, and calculates the entropy (strength) of the generated password. Use this calculator for accurate, instant results.

How accurate is the Random Password calculator?

The calculator uses the standard published formula for random password. Results are accurate to the precision of the inputs you provide. For financial, medical, or legal decisions, always verify with a qualified professional.

What units does the Random Password calculator use?

Enter values in the units shown in each input field. The calculator displays results in standard units and shows the calculation steps.

What formula does the Random Password calculator use?

The core formula is: Entropy = L × log₂(N) bits. Each step in the calculation is shown so you can verify the result manually.

References

›Password security — NIST SP 800-63B

Formula-verified for precision

Reviewed October 2026

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