Age Calculator
Calculate your exact age in years, months, days, hours, and minutes. See your next birthday countdown — instantly, privately, in your browser.
Enter Dates
Your Age
Enter your date of birth to see your age.
TL;DR
Enter your date of birth above and you get your exact age as years + months + days, plus total days lived and a countdown to your next birthday. The math follows the same "borrow from the previous month" rule courts and government forms use, so a result like 25 years, 10 months, 26 daysis precise — not rounded. Born on February 29? The leap-year section below explains exactly which day your birthday lands on in common years. And if you have heard you are "one age in the West but older in Korea," the reckoning table clears that up too.
How your exact age is calculated, step by step
Age is not simply "this year minus your birth year." That overstates your age until your birthday passes. The correct method works down through three units — years, then months, then days — and borrows when a value goes negative, exactly like long subtraction:
- Subtract the days. If today's day-of-month is smaller than your birth day-of-month, borrow one month — add the number of days in the previous calendar month — and reduce the month count by one.
- Subtract the months. If the month now goes negative, borrow one year (add 12 months) and reduce the year count by one.
- Subtract the years. Whatever remains is your completed age in years.
Because each month has a different length, the day count borrowed depends on which month you borrow from — that is why two people the same number of total days apart can show slightly different months/days breakdowns.
If you were born on February 29 (the leap-year birthday)
February 29 only exists in leap years — years divisible by 4, except century years not divisible by 400 (so 2000 was a leap year, 1900 and 2100 are not). A "leapling" therefore has a true calendar birthday only once every four years. In the three common years between, your birthday rolls over to one of two dates depending on the rule a system uses:
| Rule used | Birthday in a common year | Where it applies |
|---|---|---|
| Roll back to Feb 28 | 28 February | New Zealand, Taiwan — you legally turn the new age at the end of Feb 28 |
| Roll forward to Mar 1 | 1 March | England & Wales, Hong Kong, and common US practice — the new age starts March 1 |
This calculator counts a completed year only when the actual anniversary is reached, so on Feb 28 of a common year it still shows you as the younger age and you tick over on March 1 — the more common convention. The practical takeaway: you have lived the same number of dayseither way; only the label for the in-between year differs. Leaplings do get to brag that they have had roughly a quarter as many "real" birthdays as everyone else.
Why your age can differ by country: Korean vs Western reckoning
Most of the world uses Western reckoning: you are 0 at birth and gain a year on each birthday. But East Asia historically used different systems, and the gap can be one or even two years.
| System | Age at birth | You get a year older... |
|---|---|---|
| Western (international) | 0 | On your birthday |
| Korean "counting age" (세는 나이) | 1 | On January 1, for everyone at once |
| Korean "year age" (연 나이) | 0 | On January 1 (current year − birth year) |
Under the traditional Korean counting system, a baby born on December 31 is "1" that day and becomes "2" the very next morning on January 1 — making them two Korean years old at one day of international age. That is why a K-pop star can be "23" in a Korean interview and "21" on their passport.
Important update: in June 2023, South Korea standardized on international (Western) agefor almost all legal and administrative purposes, retiring the counting-age system in official contexts. Counting age still appears in casual conversation, and "year age" is kept for a few rules like school entry and alcohol/tobacco eligibility. This calculator reports Western age, which is what your passport, visa, and Korean government records now use.
Milestone and legal ages by country (US, UK, Canada, Australia)
Knowing your exact age is most useful when you are checking it against a threshold. These are the headline legal ages in four English-speaking countries. Where a figure varies by state, province, or territory, the range is shown.
| Milestone | United States | United Kingdom | Canada | Australia |
|---|---|---|---|---|
| Vote in national elections | 18 | 18 | 18 | 18 (voting is compulsory) |
| Learner / supervised driving | 14–16 (by state) | 17 (16 for some) | 14–16 (by province) | 16 (learner permit) |
| Full / unrestricted driving | 16–18 (by state) | 17 | 16–17 (by province) | ~18 (after P-plates) |
| Buy alcohol | 21 | 18 | 18–19 (by province) | 18 |
| Marry without parental consent | 18 (most states) | 18 | 18–19 (by province) | 18 |
| Standard / state pension age | 66–67 (full Social Security) | 66 (rising to 67) | 65 (OAS); 60+ CPP option | 67 (Age Pension) |
Figures reflect general rules as of 2026 and are for orientation only — not legal advice. Driving, drinking, and pension rules in particular vary by state, province, or territory and change over time. Always confirm with the relevant official authority before relying on a threshold.
How the next-birthday countdown works
The countdown finds your birthday in the current year. If that date has already passed, it rolls to next year, then counts the calendar days from today to that anniversary. Because the gap can span a leap day, the "days until" figure isn't always 365 — a window that crosses February 29 is 366 days, and a year that doesn't is 365.
On the morning of your birthday the countdown reads 0 daysand your completed-years figure increments. The day after, it resets to the full count to your next birthday. This is also handy for the inverse question: enter a future target date as "today" in your head and you can see how old you (or a child, for a school cut-off) will be on that day.
Questions people ask about calculating age
How do I calculate my exact age in years, months, and days?
Subtract your birth date from today one unit at a time: days first, then months, then years, borrowing when a value goes negative. For example, from 15 March 2000 to 10 February 2026 the result is 25 years, 10 months, and 26 days — not 26 years, because your March birthday hasn't happened yet this year. Enter your date of birth above to get the precise breakdown without doing the borrowing by hand.
If I was born on February 29, when is my birthday in non-leap years?
It depends on the local rule. New Zealand and Taiwan treat February 28 as the day you reach the new age; England and Wales (under the Family Law Reform Act 1969), Hong Kong, and common US practice use March 1. This calculator credits the completed year on March 1 in common years and on February 29 in leap years. Either way you have lived the exact same number of days — only the label for the in-between year changes.
What is Korean age and is it still used in 2026?
Traditional Korean "counting age" makes you 1 at birth and adds a year for everyone on January 1, so you could be up to two years older than your international age. In June 2023 South Korea adopted international (Western) age for legal and administrative purposes, so your passport, contracts, and government records now use the same age the rest of the world does. Counting age survives in casual speech, and a separate "year age" still governs a few rules like school entry.
Why does "current year minus birth year" give the wrong age?
Because it assumes your birthday has already passed this year. If you were born in November and it is currently June, that shortcut adds a year you haven't earned yet. Correct age only counts completed years, which is why this tool checks whether your birthday has occurred yet in the current year before settling the year count.
How many days until my next birthday?
Enter your date of birth and the tool shows the exact number of days to your next birthday. It can be 365 or 366 depending on whether a February 29 falls inside the window. On the day itself the countdown shows 0 and your age ticks up.
Is my date of birth kept private?
Yes. The calculation runs entirely in your browser — your date of birth is never uploaded to any server. You can confirm this in your browser's DevTools under the Network tab: entering a date triggers zero network requests.