What is a NIC number in Sri Lanka?

NIC stands for National Identity Card. In Sri Lanka the NIC number is the unique personal identifier issued by the Department for Registration of Persons (DRP) to every citizen aged 16 and above. It is required for opening bank accounts, signing contracts, sitting government exams, applying for a passport, and most official transactions. The number is not random — it encodes your year of birth, day of birth, and gender, which is why a date of birth can be decoded directly from the digits.

How do I convert my old NIC to the new NIC number format?

The mathematical conversion from old (10-character) to new (12-digit) NIC follows this pattern: prefix '19' before the 2-digit year to get a 4-digit year; keep the 3-digit day-of-year field unchanged (including any +500 female offset); prefix the 3-digit serial with '0' to make it 4 digits; and keep the check digit. So an old NIC of 901234567V becomes 1990 + 123 + 0456 + 7 = 199012304567. This tool computes and shows that equivalent new-format number in the results panel. Note: the DRP physically issues the real new-format NIC card — this tool gives the computed equivalent for form-filling reference only.

What information is stored in a Sri Lanka NIC number?

A Sri Lankan NIC number packs five pieces of information into its digits: (1) the birth year — last 2 digits in the old format, full 4 digits in the new format; (2) the day-of-year of birth — digits 3–5 in the old format, digits 5–7 in the new format; (3) the gender — if that day-of-year value exceeds 500 the holder is Female and the real day is the value minus 500, otherwise Male; (4) an issuance serial number — 3 digits in the old format, 4 digits in the new format; (5) a check digit. Old NICs also carry a V or X suffix indicating voter status at the time of issuance.

How do you find the date of birth from a Sri Lankan NIC number?

Every Sri Lankan NIC encodes the date of birth in the first 5–7 characters. For the old 10-character format the year is in positions 1–2 (treat as 19YY) and the day-of-year is in positions 3–5. For the new 12-digit format the year is in positions 1–4 and the day-of-year is in positions 5–7. If the day-of-year value is greater than 500, subtract 500 to get the actual day-of-year — the +500 offset is how the NIC encodes Female gender. Convert that day-of-year to a calendar date (day 60 is 1 March in a non-leap year, 29 February in a leap year) and you have the DOB.

What is the difference between old and new NIC numbers in Sri Lanka?

The old format has 10 characters: 9 digits followed by a V or X. It uses a 2-digit year and a 3-digit serial, and was issued up to 2016. The new e-NIC format has 12 digits with no trailing letter; it carries a 4-digit year and a 4-digit serial. Both formats encode day-of-year in the same way, including the +500 offset for female. The Department for Registration of Persons began rolling out the 12-digit number from 2016 to harmonise the NIC with other government databases.

What does the V or X letter at the end of an NIC number mean?

On an old-format NIC the last character is V or X. V means the holder was registered as eligible to vote at the time of issuance; X means they were not (typically issued to under-18s or non-citizens at the time). It is a status at the moment of issuance — current voter eligibility is governed by the Election Commission's voter register, not by the letter on the card.

How do I know if a Sri Lankan NIC number is real?

This tool checks structure: that the length is right (10 with V/X, or 12 digits), that the embedded year is in a sensible range, that the day-of-year falls within 1–366 (or 501–866 for female), and that the suffix on old NICs is a valid letter. The Department for Registration of Persons has not published the check-digit algorithm, so no third-party tool — including this one — can verify a NIC's check digit. For authoritative verification you would need to contact DRP directly. A NIC that passes structural validation here is well-formed but not necessarily issued.

How do you tell gender from an NIC number?

Read the 3-digit day-of-year field. If it is 001–366 the holder is Male and that value is the actual day of birth in the year. If it is 501–866 the holder is Female and the actual day of birth is the value minus 500. So 793 decodes to Female, day 293. The encoding is unchanged between the old and new formats.

Is my NIC sent anywhere when I use this tool?

No. The decoder is a client-side React component — the NIC you type is parsed and validated entirely in your browser using a local TypeScript module. No NIC is sent to a server, written to analytics, or stored. You can verify this by opening your browser's Network tab while you use the tool.

Can this tool produce an actual new-format NIC for an old number?

Mathematically yes — the new 12-digit NIC equivalent is 19YY + DDD (with the +500 female offset preserved) + 0SSS + C. The tool shows this computed equivalent so you can cross-reference forms that ask for the new format. But the only entity that *issues* the real new-format NIC is the Department for Registration of Persons; the computed value here is for reference, not legal substitution.

Why does my NIC say I was born on a date that's slightly off?

Three common causes. First, leap-year boundaries — day 60 in a leap year is 29 February but 1 March otherwise, so DOBs in late February or early March can look shifted by one day depending on the year. Second, the day-of-year encoding was historically applied with off-by-one inconsistencies in early bulk-issued NICs; if the calculated DOB is one day off your birthday, this is the likely cause. Third, the NIC records the date supplied at registration, which is not always the corrected birth certificate date. The decoded value here always matches the literal format spec.

When was this tool last verified against the DRP format spec?

The decoding rules used here were last cross-checked against the publicly documented Department for Registration of Persons NIC format on 2026-05-10. If DRP publishes an official check-digit algorithm we will add it; until then the tool labels validation as structural only.

Sri Lanka · Identity

Sri Lanka NIC Number Decoder — Old NIC to New NIC Converter

Paste any Sri Lankan National Identity Card number — old 10-character format (9 digits + V/X) or new 12-digit format — and see the date of birth, age, gender, voter status, and serial in a single field breakdown. Everything is decoded in your browser; nothing is uploaded.

By Induwara Ashinsana— Executive Director, Ryzera TechnologiesUpdated May 10, 2026

Decode a Sri Lankan NICOld & new format

Client-side · No upload

NIC number

10 characters (old: 9 digits + V/X) or 12 digits (new). Nothing leaves your browser — input is decoded locally.

Age as of

Try a sample

Structurally valid

Format, year, day-of-year and suffix are well-formed. Check digit not verified (no public DRP algorithm).

old format

Date of birth

1990-10-20

20 October 1990

Age today

35y 8m 13d

35 years total

Gender

Male

Day field 001–366

Voter status

Eligible (V)

Old format trailing letter

How we decoded this

Position	Field	Raw	Decoded
1–2	Year (YY)	90	1990 → 1990
3–5	Day (DDD)	293	Day 293 (Male)
6–8	Serial (SSS)	456	Issuance serial 456
9	Check digit	7	Not verified — no public DRP algorithm
10	Voter letter	V	V → voter eligible at issuance

Equivalent new-format NIC (computed)

199029304567

Mathematically equivalent — DRP is the only authority that issues the actual new NIC.

Format spec: Department for Registration of Persons (DRP). No check-digit algorithm is officially published — this tool validates structure only.

How it works

A Sri Lankan NIC is not a random ID. The Department for Registration of Persons (DRP) packs the holder's year of birth, day-of-year, gender, and an issuance serial into the digits themselves, with a single trailing check digit and (on old cards) a V or X suffix indicating voter eligibility at the time of registration. Once you know which positions mean what, the entire date of birth falls out arithmetically — which is exactly what the tool above does.

Old format (pre-2016, 10 characters)

Pattern: YY DDD SSS C X where YY is the last 2 digits of birth year (always interpreted as 19YY — old NICs were issued through 2015 and the holder must be 16+, so the practical range is 1900–1999), DDD is the 3-digit day-of-year field (1–366 for Male; 501–866 for Female, i.e. the same day with +500 added), SSS is a 3-digit issuance serial, Cis a single check digit, and the final V (voter) or X (non-voter) letter records the holder's voter status at the time the card was issued.

New format (2016+, 12 digits)

Pattern: YYYY DDD SSSS C. The year is now stored in full, the serial widens from 3 to 4 digits, and the trailing voter letter is removed (voter eligibility moved to the separate Election Commission register). The gender encoding — DDD ≥ 501 means Female — is unchanged so the new NIC remains self-decoding.

Day-of-year to calendar date

After stripping the +500 offset where applicable, the day-of-year is converted to a date using standard Gregorian arithmetic. Day 1 is 1 January; day 60 is 1 March in a normal year and 29 February in a leap year; day 366 only exists in leap years. The tool flags out-of-range values (for example, day 366 in 1990) as invalid rather than silently wrapping into the next year.

Age

Age is computed against the reference date you supply (default: today) as a whole years / months / days difference, with proper month-overflow borrowing — the same calendar-arithmetic any payroll or KYC system would use. Set the reference date to a future date to project the holder's age on that day.

What we do not do

DRP has never published the check-digit algorithm, so this tool — like every other public NIC tool — validates structure only. A NIC that passes here is well-formed; it is not necessarily issued. For authoritative verification, contact DRP. The tool also does not look up any government database, store input, or compute a checksum.

Worked examples

Input NIC

902934567V(Old format · Female · Voter)

Length: 10 chars (9 digits + V) → old format ✓
Year YY = 90 → 1990
Day DDD = 793 > 500 → Female, actual day = 793 − 500 = 293
1990 is not a leap year (366-day check: 1990/4 = 497.5)
Day 293 of 1990 → 20 October 1990
Serial SSS = 456, check digit = 7
Suffix V → voter eligible at issuance
Equivalent new NIC = 1990 + 793 + 0456 + 7 = 199079304567
Age on 2026-05-10: 35 years, 6 months, 20 days

Input NIC

200218502345(New format · Male)

Length: 12 digits → new format ✓
Year YYYY = 2002
Day DDD = 185 ≤ 500 → Male, actual day = 185
Day 185 of 2002 → 4 July 2002 (Jan 31 + Feb 28 + Mar 31 + Apr 30 + May 31 + 4)
Serial SSSS = 0234, check digit = 5
Age on 2026-05-10: 23 years, 10 months, 6 days

Input NIC

889994321V(Invalid)

Length: 10 chars → looks like old format
Year YY = 88 → 1988 (leap year — 366 days)
Day DDD = 999 > 500 → Female, actual day = 999 − 500 = 499
Day 499 > 366 → out of range
Verdict: structurally invalid (day-of-year exceeds days in year)

Frequently asked questions

Sources & references

Decoding rules were last cross-checked against the DRP-published NIC format on 2026-05-10. The page is reviewed whenever DRP announces a format change.

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