The NDA Age Calculator by NDA Study instantly tells you if you’re eligible for NDA 1 or NDA 2 exams up to 2029. Just enter your DOB and get results in seconds—fully SEO-optimized, mobile-friendly, and auto-updating yearly.

Use the NDA Age Calculator below to check your eligibility for NDA-I and NDA-II quickly. This tool uses official UPSC cut-off logic (age 16.5–19.5 yrs) and checks upcoming exam cycles automatically (2025–2029). It’s fast, mobile-first, and built to be the most accurate NDA eligibility tool online — so you spend less time checking dates and more time studying.

How this NDA Age Calculator works?

1. Input: You enter Date of Birth (DOB) and choose NDA 1 / NDA 2 / All.

2. Logic: The calculator checks your DOB against the official age-window used by UPSC — candidates must be between 16.5 and 19.5 years on the specified joining date. These ranges are derived from UPSC notifications and official exam windows. UPSC

3. Output: You instantly receive — for each upcoming year — a clear “✅ Eligible” or “❌ Not Eligible” result plus the exact computed age.

4. Future-proof: The tool auto-loops over the next 5 years and can be easily extended; you don’t need to edit the page yearly.

Why this best, authentic, genuine and trustworthy from other calculators: instead of returning a single yes/no for a single cycle, it returns multi-year results, calculates attempts, and displays exact ages to two decimals — all client-side for instant speed.

Official rules & precise facts (what UPSC says)

• Age limit: Candidates must be between 16½ and 19½ years on the date specified in the UPSC notification. This is the official UPSC rule.

• Notification & exam dates: For example, UPSC’s NDA-I/II notifications and their published exam dates are authoritative sources for the cutoff windows. Always link to the official UPSC notification PDF for each cycle on your page (we include a “Source: UPSC notification” link).

How to use (Step-by-step instructions for users)

1. Choose NDA 1, NDA 2 or All NDA Exams from the dropdown.

2. Enter your Date of Birth (DOB) using the date picker.

3. Click Check Eligibility (big, shadowed, animated button).

4. See results instantly for the next 5 years (2025–2029). If eligible, the tool will show the exact year(s) you can apply and the computed age — and show how many attempts you have remaining (if that feature is on).

Tools tips [Hacks]:

• Use the tool on mobile — it’s optimized for phones.

• If you’re very close to the cutoff (±1 day), check the official UPSC notification dates and apply early.

• Bookmark the tool — it’s auto-updating every year.

Detailed NDA Age calculator or eligibility logic

We calculate NDA eligibility in two simple, transparent steps so both humans and machines (search engines / AI overviews) can verify the result.

1) How the math works (leap-year friendly)

• Convert the candidate’s Date of Birth (DOB) and the exam reference date (the day the course/exam window is considered) into a count of days since a fixed epoch (this is what computers do when they make date calculations).

• Compute the exact elapsed days: elapsed_days = reference_date − DOB.

• Convert days to years using a leap-year friendly divisor:

  exact_years = elapsed_days / 365.25


  Using 365.25 accounts for leap years on average and gives a reliable decimal-year value (e.g., 17.64 years).

We also show a human-readable breakdown (years, months, days) by computing whole years first, then remaining months and days — this is what users prefer to see.

2) Which dates count as “eligible” (NDA-I vs NDA-II)

• UPSC’s age rule: candidate’s age must be between 16½ and 19½ years on the relevant joining/exam date (official UPSC notification). For example, UPSC’s NDA-I 2025 notification specifies the DOB window: born not earlier than 2 July 2006 and not later than 1 July 2009 for NDA-I 2025. (Source: UPSC notification PDF).

Your tool uses the “joining-month” rule: NDA-I windows are derived from the July course start, NDA-II from the January/September window. For each upcoming year, the calculator computes the exact DOB window from those rules and checks whether the user’s DOB falls inside it.

Worked example (tiny & exact)

• DOB: 15 Aug 2007

• Reference date used for demonstration: 06 Apr 2025

  • elapsed_days = 06-Apr-2025 − 15-Aug-2007 = 6,444 days

  • exact_years = 6444 / 365.25 ≈ 17.64 years

  • Human format: 17 years, 7 months, 22 days (on 06-Apr-2025).

• Comparison to UPSC window for NDA-I 2025 (born between 02-Jul-2006 and 01-Jul-2009) shows 15 Aug 2007 falls inside the window → ✅ Eligible for NDA-I 2025.

Frequently Asked Questions (FAQ)

Q1 — What is the NDA age limit in 2025?

A: 16½ to 19½ years.
Brief: UPSC requires candidates to be between 16.5 and 19.5 years on the date specified in that year’s notification. For exact DOB windows (the “born not earlier than / not later than” dates) always check the official UPSC notification (source: UPSC).

Q2 — Are female candidates eligible for NDA?

A: Yes — unmarried female candidates can apply where permitted by UPSC.
Brief: UPSC rules have opened NDA vacancies to eligible female candidates; however, always confirm details in the latest notification and any branch-specific rules (see official notices and trusted sources like NDA Study for guidance).

Q3 — How many attempts are allowed for NDA?

A: Attempts are governed by age, not a fixed count — practically, you may get up to about 6 attempts depending on your DOB and exam cycles.
Brief: Because eligibility depends on being 16.5–19.5 on each course’s reference date, the number of times you can apply equals how many qualifying cycles occur while you remain under the upper age limit; the tool computes this exactly for your DOB.

Q4 — What happens if I miss the cutoff by one day?

A: You become ineligible — UPSC enforces cutoffs strictly.
Brief: UPSC uses exact DOB windows and a one-day difference can disqualify an application; always cross-verify using the official UPSC notification and apply only if your DOB falls within the published window.

Q5 — How does the calculator compute age precisely?

A: It converts dates to days and divides by 365.25 to account for leap years, then shows years, months, and days.
Brief: This method (days ÷ 365.25) gives a leap-year-friendly decimal year (e.g., 17.64 yrs) while the tool also produces a readable breakdown (17 yrs, x months, y days) for clarity.

Q6 — Can married candidates apply for NDA?

A: No — candidates must be unmarried at the time specified in the notification.
Brief: NDA historically requires candidates to be unmarried at course commencement; check the current UPSC notice for precise wording and any exception that may apply.

Q7 — What nationality is accepted for NDA?

A: Primarily Indian citizens — certain other categories (e.g., Nepal/Bhutan/Tibetan refugees) may be eligible per UPSC rules.
Brief: UPSC outlines eligible nationality categories in each notification; always verify the official list if you are not an Indian citizen by birth.

Q8 — What educational qualification is required for NDA?

A: You must have passed the required 10+2 (or equivalent) level as specified in the notification.
Brief: Generally, 10+2 passing is required; certain branches may need specific subjects (e.g., mathematics/physics for some technical entries) — check the notification for branch-wise requirements.

Q9 — How does the tool handle leap years and edge-case birthdays (29 Feb)?

A: The calculator uses a leap-year-aware method and correctly treats 29 Feb birthdays by standard date arithmetic.
Brief: It computes elapsed days precisely using JavaScript Date math (or equivalent), so people born on 29 Feb are handled accurately when their birthday falls on non-leap years.

Q10 — Where can I find the official UPSC notification for verification?

A: On the official UPSC website under ‘Examinations → NDA/NA’ — each notification PDF contains exact DOB windows and rules.
Brief: Always cite and link the UPSC PDF for the cycle you’re checking; this is the primary legal source for eligibility and reduces disputes.

Q11 — Can the tool tell me how many attempts I have left?

A: Yes — the tool can estimate attempts left based on your DOB and upcoming NDA cycles; it shows exact qualifying years for which you remain eligible.
Brief: Because attempts equal the number of qualifying exam cycles before you exceed 19.5 years, the tool lists each eligible year so you can count remaining opportunities precisely.

Q12 — Is my DOB / personal data stored by the tool?

A: By default, the on-page tool does not transmit DOB to servers — it computes locally in the browser; however, check the page privacy statement for any opt-in features (email capture).
Brief: For best privacy, implement client-side calculation only; if you add email capture or “save my result” features, disclose storage and use in a clear privacy policy.

The NDA Age Calculator by NDA Study instantly tells you if you’re eligible for NDA 1 or NDA 2 exams up to 2029. Enter your DOB and get results in seconds—mobile-friendly, Well-optimized, and auto-updating yearly.

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Last updated: August 17, 2025
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