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Age Calculator

Find out exactly how old you are in years, months and days, plus your age in total months, weeks, days and hours. See what weekday you were born on, count down to your next birthday, and check your age on any past or future date.

Runs in your browserFreeNo sign-up

Processed on your device. Files and text stay in your browser and are not uploaded to our servers. How privacy works

How to use the age calculator

  1. Pick your date of birth with the date picker (or type it as YYYY-MM-DD).
  2. Read your age in years, months and days, with totals in weeks, days and hours alongside.
  3. Turn on “Calculate age on another date” to see how old you were, or will be, on a specific date such as an exam cut-off or a retirement date.
  4. Copy the summary or the next-birthday line to share it.

Features

  • Age in years, months and days, plus total months, weeks, days and hours
  • Weekday you were born on and the weekday of your next birthday
  • Countdown to your next birthday and the age you'll turn
  • Age on any date, past or future
  • Correct handling of leap years and 29 February birthdays
  • Everything runs in your browser; your date of birth is never sent anywhere

How the age is counted

Whole years are counted first: you turn a year older on each anniversary of your birth date. Then whole months are counted from the last birthday, and finally the leftover days. Example: someone born on 15 June 1990 is 36 years, 3 months and 8 days old on 23 September 2026, which is also 13,249 days or 1,892 weeks and 5 days.

When a month is shorter than your birth day, reaching its last day counts as a full month. So a person born on 31 January is one month old on 28 February (or 29 February in a leap year), and one month and one day old on 1 March.

Leap-year birthdays

If you were born on 29 February, the calculator observes your birthday on 28 February in years that have no 29th. That keeps the whole-year count consistent: on 28 February you have completed another full year, and on 1 March you are one year and one day old. Some countries legally treat 1 March as the birthday instead; if that matters for a form or deadline, check the rule that applies to you.

Limits

Ages are counted in calendar days, so hours and minutes of birth are ignored and the hour total is simply days × 24. Dates are interpreted in your own calendar day, without time zones. The tool follows the Gregorian calendar throughout, including for historical dates before it was adopted.

Frequently asked questions

How do I calculate my age from my date of birth?

Subtract your birth year from the current year, then subtract one if this year's birthday hasn't happened yet. This calculator does that and also gives the extra months and days, the total number of days you've lived, and the countdown to your next birthday.

Why does the days total not match years × 365?

Leap years add a day every four years (except most century years). 36 years contain 8 or 9 leap days, which is why the total-days figure is a little higher than 36 × 365. The calculator counts the actual calendar days between the two dates.

Can I find my age on a future date?

Yes. Switch on “Calculate age on another date” and choose any date. This is useful for age limits on exams, visas, insurance and retirement, where the rule is usually your completed years on a specific date.

Is my date of birth stored or uploaded?

No. The calculation happens entirely in your browser. Nothing is sent to a server and nothing is saved when you close the page.

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