Calculate the identifier check character.
Initialising algorithm engine for Finnish Personal Identity Check Calculator...
How Finnish Personal Identity Check Calculator Works?
The Finnish Personal Identity Check Calculator joins the 6-digit birth date and 3-digit individual number. It divides this 9-digit number by 31. The remainder maps to the check character.
- 1Enter the birth date DDMMYY and the individual number NNN (002–899).
- 2Join them into a 9-digit number (the century sign is ignored).
- 3Compute the remainder modulo 31.
- 4Map the remainder through 0123456789ABCDEFHJKLMNPRSTUVWXY.
- 5Write DDMMYY + century sign + NNN + check character.
Finnish Personal Identity Check Calculator Formula
The Finnish HETU formula is Check = T[(DDMMYYNNN) mod 31], where T is the 31-character table.
r = int(DDMMYY ‖ NNN) mod 31 Check = "0123456789ABCDEFHJKLMNPRSTUVWXY"[r]
Tskips G, I, O, Q, and Z to avoid confusion.
131052308 mod 31 = 25 Check = T HETU = 131052-308T
Finnish Personal Identity Check Calculator Conversion Table
The HETU conversion table maps remainders 0–30 to check characters.
| Remainder | Character | Remainder | Character | Remainder | Character |
|---|---|---|---|---|---|
| 0 | 0 | 11 | B | 22 | P |
| 1 | 1 | 12 | C | 23 | R |
| 2 | 2 | 13 | D | 24 | S |
| 3 | 3 | 14 | E | 25 | T |
| 4 | 4 | 15 | F | 26 | U |
| 5 | 5 | 16 | H | 27 | V |
| 6 | 6 | 17 | J | 28 | W |
| 7 | 7 | 18 | K | 29 | X |
| 8 | 8 | 19 | L | 30 | Y |
| 9 | 9 | 20 | M | ||
| 10 | A | 21 | N |
Century signs: + for 1800s; - (or Y, X, W, V, U) for 1900s; A (or B, C, D, E, F) for 2000s.
What is Finnish Personal Identity Check Calculator?
A Finnish Personal Identity Check Calculator is a tool that computes the check character of a Finnish personal identity code (henkilötunnus, HETU). The Digital and Population Data Services Agency (DVV) assigns the code.
Odd individual numbers belong to men and even numbers to women. Since 2023, extra century signs (Y, X, W, V, U for 1900s and B–F for 2000s) are allowed.
What are the uses of Finnish Personal Identity Check Calculator?
There are 3 main uses of the Finnish Personal Identity Check Calculator, including healthcare systems, banking onboarding, and test data.
- Healthcare systems: Patient systems validate HETUs on entry.
- Banking onboarding: Banks check HETUs before strong identification.
- Test data: Developers build test codes with individual numbers 900–999.