Password strength rules (like Google)

I. Password Length:

• 5: less than or equal to 4 characters
• 10: 5 to 7 characters
• 25 points: greater than or equal to 8 characters

2. letters:

• 0: no letters
• 10 points: all are small (BIG) Letters
• 20: uppercase/lowercase letters

Iii. Numbers:

• 0: No number
• 10 points: 1 digit
• 20 points: greater than or equal to three digits

Iv. symbols:

• 0: No symbol
• 10 points: 1 Symbol
• 25 points: more than 1 Symbol

5. rewards:

• 2 points: letters and numbers
• 3 points: letters, numbers, and symbols
• 5 points: uppercase/lowercase letters, numbers, and symbols

Final scoring criteria:

• > = 90: extremely secure
• > = 80: Security (secure)
• > = 70: very strong
• > = 60: strong (strong)
• > = 50: Average (average)
• > = 25: weak)
• > = 0: very weak

Source: How to Make a password strength meter like Google V2.0