Age Calculator
EverydayCalculate your exact age in years, months, and days from your date of birth. Also shows days until your next birthday.
Your Age
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What is a Age?
An age calculator computes your exact age — in years, months, and days — from a given date of birth to any reference date. Unlike a rough "birth year subtracted from current year" estimate, a proper age calculation accounts for the specific month and day, giving you a precise result down to the individual day. Our free online age calculator also shows your total days lived and the number of days until your next birthday, making it useful for far more than simple curiosity.
Knowing your exact age has practical significance in India. Government scheme eligibility — from school admissions and competitive examinations (where the upper age limit is often 28 or 32 years as of a specific date) to senior citizen tax benefits (applicable from 60 years) and super senior citizen status (from 80 years) — is determined using a precise date-based age, not just a birth year. Insurance underwriters, banks issuing home loans, and NPS account managers all use date-of-birth verification where being even one day short of an age threshold can affect eligibility.
The calculator supports two inputs: your Date of Birth and an Age As Of date that defaults to today but can be set to any past or future date. This makes it equally useful for checking your age at the time of an old examination result, verifying a family member's eligibility for a scheme, or simply finding out how many days you have lived so far.
For people planning their long-term finances, age is also a critical variable. Retirement corpus targets, insurance premium calculations, and pension drawdown timelines all depend on how old you are and how many productive earning years remain. Once you know your exact age from this tool, the SIP Calculator can help you model how a monthly investment started today will grow over your remaining working years.
How to use this Age calculator
Enter your Date of Birth — type or select from the date picker. The calculator accepts any date from the past. For verifying a child's age, enter the child's date of birth here.
Set the Age As Of date — this defaults to today's date, which is correct for most uses. To check age on a specific past or future date (e.g. a scheme's application deadline or an examination date), click the field and select the relevant date.
Read the primary result — the large number in the result card shows your age in years. The months and days next to it complete the exact age breakdown.
Check Days Lived and Next Birthday — the two tiles below the age show your total days lived and the countdown to your next birthday. If the countdown shows 0 and a birthday message appears, today is your birthday.
Use the step breakdown — scroll below the result card to see how the calculation was performed: the two input dates, the derived exact age, total days, and the next birthday date with its countdown. This is useful for confirming the result against an official document or scheme notification.
Formula & Methodology
Age calculation — step by step: Given Date of Birth (DOB) and Reference Date (Ref): 1. days = Ref.day − DOB.day — If days < 0: months − 1, days + daysInPreviousMonth(Ref) 2. months = Ref.month − DOB.month − (borrow from step 1) — If months < 0: years − 1, months + 12 3. years = Ref.year − DOB.year − (borrow from step 2) Total days lived: Total days = ⌊ (Ref − DOB) ÷ 86,400,000 ⌋ where Ref and DOB are Unix timestamps in milliseconds and ⌊ ⌋ denotes the floor (round down). Next birthday countdown: nextBirthday = Date(Ref.year, DOB.month, DOB.day) — If nextBirthday < Ref: nextBirthday = Date(Ref.year + 1, DOB.month, DOB.day) daysToNextBirthday = ⌊ (nextBirthday − Ref) ÷ 86,400,000 ⌋ Variable definitions: - DOB.day / DOB.month / DOB.year — day, month, year components of the date of birth - Ref.day / Ref.month / Ref.year — day, month, year components of the reference date - daysInPreviousMonth(Ref) — the number of days in the calendar month immediately before Ref's month (e.g. 28 or 29 for February, 31 for January) Worked example: Date of Birth: 15 March 1990 Age As Of: 12 June 2026 1. days = 12 − 15 = −3 → borrow: months − 1, days + 31 (May has 31 days) → days = 28 2. months = 5 − 2 − 1 (borrow) = 2 (no further borrow needed) 3. years = 2026 − 1990 = 36 Result: 36 years, 2 months, 28 days Total days = ⌊ (12 June 2026 − 15 March 1990) ÷ 86,400,000 ⌋ ≈ 13,238 days Next birthday: 15 March 2027 → 276 days away Assumptions: - All dates are treated as local midnight (not UTC) to avoid timezone-related off-by-one errors — particularly relevant for users in IST (UTC +5:30). - "Next birthday" rolls forward to the following year if the birthday has already passed in the current calendar year. - Leap year birthdays (29 February) use 1 March as the effective birthday in non-leap years for the next-birthday countdown only; the exact age calculation is not affected.