As of 2026, the NDA age limit is 16½ to 19½ years, with no relaxation for any category. A candidate must be at least 16 years 6 months and not more than 19 years 6 months old on the first day of the month in which the course is due to commence — the same window for men and women, and for SC, ST and OBC candidates alike. UPSC holds the exam twice a year (NDA I and NDA II), and each notification fixes the exact date-of-birth cut-off against that commencement date, so always confirm the dates in the current notification before applying.
The NDA (National Defence Academy) exam requires you to be between 16.5 and 19.5 years of age on the date specified in the notification. This is the tightest age window of any UPSC exam — and it's the only UPSC exam where you can appear while still in Class 11 or 12. Miss this window and your NDA chance is gone permanently.
UPSC conducts NDA twice a year — NDA I (April) and NDA II (September). Each notification has a specific date for age calculation, usually the 1st of the month the course commences. Read the notification carefully.
NDA Age Limit: The Exact Numbers
The age window is non-negotiable and doesn't carry relaxation for any category.
Age Requirement for NDA 2026
| Parameter | Details |
|---|---|
| Minimum Age | 16 years and 6 months |
| Maximum Age | 19 years and 6 months |
| Age Reckoning Date | 1st of the month in which course commences |
| Age Relaxation (SC/ST/OBC) | None |
| Age Relaxation (Ex-Servicemen) | None (NDA is for first-time enrolment) |
Practical implication (illustrative): If a course commences on 1 January 2027, a candidate born on 1 July 2007 turns exactly 19 years 6 months on that date — right at the upper limit. Born on 2 July 2007, they would be a day under 19½ and still eligible; born on 1 July 2010, they would be exactly 16½ and just cross the lower limit. Always check the birth-date range printed in the notification you are applying under.
The NDA age window means you typically appear for the exam in Class 11 (NDA I or II of your 11th year) or Class 12 (both cycles). Very rarely does someone appear as late as their first year of college.
Why Such a Tight Window?
The NDA is a 3-year joint training academy followed by 1-year service-specific training. The total training period lasts 4 years. Commissioning at a young age — typically 21–22 — is deliberate. Defence service careers are physically demanding, and early induction allows longer service before the mandated retirement ages.
Educational Qualification
The NDA requires 10+2 level qualification. But which stream matters more than just "Class 12 pass."
Qualification by Wing
| Wing/Service | Minimum Qualification |
|---|---|
| Army Wing | Class 12 passed or appearing (any stream) |
| Navy Wing | Class 12 with Physics and Mathematics |
| Air Force Wing | Class 12 with Physics and Mathematics |
The Army Wing is stream-agnostic. A student from Commerce or Arts stream can apply for Army but not for Navy or Air Force.
Physics and Mathematics requirement: This is mandatory for Navy and Air Force — not optional. If you're in Class 11 without Physics and Maths, you can't target Navy or Air Force at NDA. Plan your stream selection early.
Appearing Candidates
Candidates appearing in Class 12 (or 10+2 equivalent) can also apply. You don't need to have passed at the time of application. But you must produce the Class 12 pass certificate at the time of joining NDA.
This is the same rule as CDS for final-year students — appear now, prove qualification before joining.
Related: CDS Exam Age Limit & Eligibility 2026
Gender Eligibility for NDA
NDA has undergone a landmark change in recent years on this front.
Supreme Court Ruling (2021) and Current Status
Before 2021, NDA was exclusively for male candidates. In August 2021, the Supreme Court of India ordered UPSC to allow women to appear in NDA. The first female candidates appeared in NDA II 2021.
Currently, women are eligible to apply for all three wings — Army, Navy, and Air Force — through NDA.
Physical standards and training undergo necessary adaptation. The merger of women into NDA is still being institutionalised — check the current notification for exact provisions applicable in 2026.
Physical Standards for NDA
Physical fitness is a core eligibility criterion. The medical examination is thorough.
Height and Weight Standards
| Wing | Minimum Height (Men) | Minimum Height (Women) |
|---|---|---|
| Army | 157 cm | 152 cm |
| Navy | 157 cm | 152 cm |
| Air Force | 162.5 cm | 152 cm |
Weight must correspond to height according to Armed Forces medical charts. There's no fixed weight number — it's assessed proportionally.
Chest Measurement
For male candidates:
- Minimum chest (deflated): 77 cm
- Minimum chest expansion: 5 cm
These are minimum standards. Candidates with better chest measurements face no issues.
Vision Standards
Vision is where most candidates get rejected.
| Wing | Distant Vision (Better Eye) | Distant Vision (Worse Eye) |
|---|---|---|
| Army | 6/6 without correction | 6/6 without correction |
| Navy | 6/6 | 6/9 |
| Air Force | 6/6 | 6/9 (but see LASIK note) |
Air Force vision is the strictest. Candidates for Air Force must have high-quality colour vision (CP-1 standard), near vision of N-5 (better eye) and N-10 (worse eye), and the squint test must be normal.
LASIK status for Air Force: LASIK surgery was historically disqualifying for pilot entry. Policy has evolved — check the current AFMS (Armed Forces Medical Services) guidelines. As of recent notifications, LASIK is now permitted under specific conditions for Air Force entry.
Colour blindness disqualifies candidates from Air Force and Navy entries. Army has more permissive standards.
Other Medical Criteria
- Hearing: Normal hearing required without hearing aids
- Ear, Nose, Throat: No DNS (Deviated Nasal Septum) beyond limits, no chronic conditions
- Orthopaedic: No flat feet beyond Grade I, no knock knees (Genu Valgum) beyond limits, no varicose veins
- Mental health: Screened through interview and medical history
- Skin: Conditions like psoriasis, eczema, or extensive vitiligo can be disqualifying
The medical board is at a military hospital. No civilian doctor's fitness certificate substitutes this.
Number of Attempts for NDA
There is no stated attempt limit in NDA rules. The practical limit is entirely determined by age.
How Many Attempts Do You Actually Get?
| Class at First Attempt | Total Possible Attempts |
|---|---|
| Class 11 (Age ~16.5–17) | 4–6 attempts |
| Class 12, first half (Age ~17–18) | 3–4 attempts |
| Class 12, second half (Age ~18–18.5) | 2–3 attempts |
| Post-12th (Age 18.5–19.5) | 1–2 attempts |
The typical NDA aspirant gets 3–4 genuine attempts. Start preparing in Class 10 or early Class 11.
Don't wait until Class 12. Many candidates make this mistake. By Class 12, you may only have 2 attempts left, and your time is divided between board exams and NDA prep.
NDA Exam Pattern 2026
Understanding the exam pattern shapes how you prepare.
Written Exam Structure
| Paper | Subject | Duration | Total Marks | Marks per Question | Negative Marking |
|---|---|---|---|---|---|
| Paper I | Mathematics | 2.5 hours | 300 | 2.5 | 0.83 |
| Paper II | General Ability Test (GAT) | 2.5 hours | 600 | — | 1.33 per wrong answer |
| Total | 5 hours | 900 |
Paper II (GAT) is divided into:
- Part A: English (200 marks)
- Part B: General Knowledge (400 marks)
General Knowledge in Paper II covers History, Geography, General Science (Physics, Chemistry, Biology), Current Events, and General Science.
SSB Interview (Stage 2)
Candidates shortlisted from the written exam appear before a Services Selection Board for 5 days. The SSB process is identical to CDS — Day 1 screening (OIR + PPDT), followed by psychological tests (TAT, WAT, SRT, SD), group tasks, and personal interview.
Total marks for NDA selection:
- Written exam: 900
- SSB Interview: 900
- Grand Total: 1800
The SSB carries equal weight to the written exam. Written merit alone isn't enough.
Medical Examination
After SSB recommendation, candidates undergo detailed medical examination at a designated military hospital. All the physical standards listed earlier are checked here. If declared unfit, a candidate can appeal to a Review Medical Board.
Comparison: NDA vs CDS
| Parameter | NDA | CDS |
|---|---|---|
| Conducting body | UPSC | UPSC |
| Age limit | 16.5–19.5 years | 19–24/25 years |
| Education | 10+2 pass or appearing | Graduation pass or appearing |
| Training duration | 3 years NDA + 1 year academy | 1–1.5 years (academy specific) |
| Service type | Permanent Commission | Permanent (IMA/INA/AFA), Short Service (OTA) |
| Commission age | ~21–22 years | ~23–24 years |
| Subjects | Maths + GAT | English + GK + Maths (IMA/INA/AFA) |
The younger entry age of NDA gives officers a longer service career. An NDA pass who commissions at 21 can serve until age 60 (for most grades) — giving nearly 39 years of service.
Related: CDS Exam Age Limit & Eligibility 2026
NDA Syllabus Highlights
Brief overview to orient your preparation:
Mathematics (Paper I): Algebra, Matrices and Determinants, Trigonometry, Analytical Geometry (2D and 3D), Differential Calculus, Integral Calculus, Differential Equations, Vector Algebra, Statistics and Probability. Class 11–12 NCERT level, but complete and rigorous.
General Ability Test (Paper II):
- English: Grammar, comprehension, vocabulary — standard Class 10–12 level
- History: Ancient, Medieval, Modern India + World History basics
- Geography: Physical, Human, Economic Geography
- Physics: Class 11–12 basics — Laws of Motion, Heat, Electricity, Optics
- Chemistry: Elements, Compounds, basic reactions, Carbon compounds
- Biology: Cell structure, Human physiology, Plant life basics
- Current Affairs: Last 12 months
Key insight: The NDA mathematics paper tests concepts you study in Class 11 and 12. A student who takes Mathematics seriously in school has a genuine advantage.
How to Apply for NDA 2026
Applications are submitted through the UPSC online portal (upsconline.nic.in). The process is fully online.
Step-by-step:
- Register on UPSC website (one-time registration)
- Fill online application form during the notification window
- Upload photograph and signature as specified
- Pay application fee (₹100 for General/OBC; SC/ST/sons of military personnel exempted)
- Download admit card when issued
Application window typically opens 3–4 weeks after the official notification.
Frequently Asked Questions
What is the minimum age for NDA exam?
The minimum age for NDA is 16 years and 6 months. The maximum is 19 years and 6 months. Age is calculated with respect to the date the course is expected to commence, as specified in the official UPSC notification.
Can a Commerce student appear for NDA?
Yes. Commerce students can apply for the Army Wing of NDA. The Army Wing accepts candidates from any stream (Science, Commerce, Arts) at Class 12. However, Navy and Air Force wings require Physics and Mathematics at Class 12 — these are not available to Commerce students unless they had these subjects.
How many attempts are allowed in NDA?
There's no official cap on attempts. The practical limit is the 19.5-year upper age limit. Most candidates get 3–6 attempts depending on when they start. There are no restrictions on reappearing after clearing written but failing SSB.
Is there a height relaxation for NDA?
No. Height standards are fixed minimums: 157 cm for Army and Navy (men), 162.5 cm for Air Force (men), and 152 cm for women across wings. There's no relaxation for any category.
What happens if you fail the NDA medical examination?
A candidate declared unfit after SSB can apply for a Review Medical Board at a different designated military hospital. The Review Board decision is generally final. Candidates declared unfit by the Review Board are not eligible to join, regardless of SSB performance.
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