SA ID Number Format Guide
Complete breakdown of the 13-digit South African ID number - What each digit means and how to read it
The 13-Digit SA ID Structure
Digits 1-6: Date of Birth
Year • Month • Day
📅 Example: 850101 means born on 1st January 1985
Digits 7-10: Gender & Sequence
Gender + Unique Sequence Number
⚧ Example: 1234 = Female (since 1234 is less than 5000)
⚧ Example: 6234 = Male (since 6234 is greater than 4999)
Digit 11: Citizenship
Citizenship Status
🆔 Example: 0 = South African Citizen, 1 = Permanent Resident
Digit 12: Race (Historical)
Race Indicator (Abolished)
⚠️ Note: This digit is now obsolete and no longer used in modern ID allocation. Most new IDs use '8'.
Digit 13: Luhn Check Digit
Validation Check Digit
The check digit is calculated using the Luhn Algorithm (Mod 10).
It validates that the ID number is mathematically correct and not randomly generated.
Calculation: (Sum of all digits including check digit) % 10 = 0
If this fails, the ID is invalid!
🔢 Example: For ID 8501011234084, the Luhn calculation confirms it's valid.
🔍 Complete Example: 8501011234084
📝 Summary:
- • This person was born on 1 January 1985
- • The person is Female
- • They are a South African Citizen
- • The ID is mathematically valid (Luhn check passed)
✓ This is a VALID South African ID number format
📋 Quick Reference Table
| Position | Digits | Description | Example Value | Meaning |
|---|---|---|---|---|
| 1-2 | YY | Year of Birth | 85 | 1985 |
| 3-4 | MM | Month of Birth | 01 | January |
| 5-6 | DD | Day of Birth | 01 | 1st day |
| 7-10 | SSSS | Gender + Sequence | 1234 | Female |
| 11 | C | Citizenship | 0 | Citizen |
| 12 | A | Race (Obsolete) | 8 | Black |
| 13 | Z | Luhn Check Digit | 4 | Validation |
🔧 ID Decoder Tool
Enter any SA ID number to see its breakdown:
⚠️ Important Notes About SA ID Format
- • Year Interpretation: The two-digit year (YY) can represent 1900s or 2000s. Generally, 00-24 = 2000s, 25-99 = 1900s.
- • Gender Range: 0000-4999 = Female, 5000-9999 = Male. This is strictly followed.
- • Citizenship Digit: 0 = Citizen, 1 = Permanent Resident. Other digits may appear but are rare.
- • Race Digit: This digit is now obsolete. Modern IDs typically use '8'.
- • Check Digit: Always verify with Luhn algorithm - this catches typing errors.
Frequently Asked Questions
How many digits does a South African ID have?
A South African ID number has exactly 13 digits. No more, no less.
What do the first 6 digits represent?
The first 6 digits represent the person's date of birth in YYMMDD format (Year, Month, Day).
How can I tell gender from an SA ID?
Look at digits 7-10. If the number is between 0000-4999 = Female. If between 5000-9999 = Male.
What is the check digit in SA ID?
The 13th digit is a Luhn algorithm check digit that validates the ID number mathematically.
Can I decode any SA ID number?
Yes! Use the ID Decoder Tool above to see the breakdown of any 13-digit SA ID number.