How long does it take to crack an 8-character password?

An 8-character password with only lowercase letters can be cracked in under 1 second. Adding uppercase, numbers, and symbols increases this to about 19 hours at 10 billion guesses/sec.

Is 10 billion guesses per second realistic?

Yes. Modern GPU clusters achieve 10+ billion hash guesses per second for algorithms like MD5. Slower algorithms like bcrypt reduce this dramatically.

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Will Your Password Be Cracked in 1 Minute?

Q: What makes a password hard to crack?

Length is the most important factor, followed by character variety. A 16-character password with mixed characters would take billions of years to crack.

Password Security Mar 09, 2026 · 6 min čítania

Most people think their password is safe. The reality? An 8-character lowercase password is cracked in less than a second. A 6-digit PIN? Instant. Try the calculator below to see how your password holds up against modern cracking hardware.

🔐 Password Crack Time Calculator

Type any password to test (nothing is sent to any server):

👁 Show password

🔒 100% client-side. Your password never leaves your browser.

How Password Cracking Works

Modern password cracking uses GPUs running billions of guesses per second. The most common methods:

Brute force: Tries every possible combination. Time depends on password length and character variety.
Dictionary attack: Tests common words and passwords from leaked databases. "password123" is cracked instantly.
Rainbow tables: Pre-computed hash lookup tables. Defeated by salted hashing algorithms.
Hybrid attack: Combines dictionary words with number/symbol substitutions (p@$$w0rd).

Password Strength by the Numbers

Password Type	Example	Crack Time
6 lowercase	secret	Instant
8 lowercase	password	~0.2 seconds
8 mixed case	PassWord	~3.5 minutes
8 mixed + numbers	P4ssw0rd	~1 hour
12 mixed + symbols	P@ss!w0rd#12	~34,000 years
16 mixed + symbols	xK9#mP2$vL7@nQ4!	~billions of years

5 Rules for Uncrackable Passwords

Use 14+ characters. Every extra character multiplies crack time exponentially.
Mix all character types. Lowercase, uppercase, numbers, and symbols.
Never reuse passwords. One breach exposes all accounts with the same password.
Avoid dictionary words. Even with substitutions like @ for a.
Use a generator. Generate an uncrackable password now →

FAQ

How long to crack an 8-character password?

With only lowercase: under 1 second. With mixed case, numbers, and symbols: about 19 hours at 10 billion guesses/sec.

What makes a password hard to crack?

Length matters most. A 16-character mixed password takes billions of years vs. seconds for an 8-character one.

Is 10 billion guesses/sec realistic?

Yes. Modern GPU clusters achieve this for MD5 hashes. Slower algorithms like bcrypt reduce the rate to ~100k/sec.

Related Tools

Password Generator — create uncrackable passwords instantly
Strong Password Guide — best practices for password creation
2FA Guide — add an extra layer of protection