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Age Calculator

Calculate exact age in years, months, days and total days lived.

Inputs

Years
24
Months
0
Days
0

Totals

Total months
288
Total weeks
1,252
Total days
8,766
Total hours
210,384
Total minutes
12,623,040
Born on
Saturday

Next Birthday

Days to next birthday
366
Jan 1, 2025 · Wednesday
Next birthday
Jan 1, 2025
Wednesday
Day of week
Wednesday

What is the Age Calculator?

An age calculator is a free online tool that calculates your exact age in years, months, and days from your date of birth. It also shows total days, weeks, and hours lived, plus a countdown to your next birthday.

Age Calculator formula

Age is calculated as the difference between two dates: age = age-at date − birth date. Years are counted as full 365-day cycles (plus leap days), months as full calendar-month cycles, and days as the remainder. Total days lived = (age-at date − birth date) in milliseconds ÷ 86,400,000.

How to use the Age calculator

  1. 1Enter your date of birth in the 'Birth Date' field.
  2. 2Optionally change the 'Age At Date' to calculate age as of a past or future date (defaults to today).
  3. 3Click Calculate to see your age in years, months and days.
  4. 4Review the totals below: total days, weeks, hours lived, and days until your next birthday.

Example calculation

If you were born on 1995-06-15 and today is 2024-11-20, your age is 29 years, 5 months and 5 days. You have lived 10,755 total days (approximately 1,536 weeks or 258,120 hours), and your next birthday is in 207 days.

Frequently asked questions

How do I calculate my exact age?
Subtract your date of birth from today's date. Years come from full year cycles, months from full calendar-month cycles between the two dates, and days are the leftover remainder. Our calculator does this automatically.
How many days old am I?
Take the difference in milliseconds between today and your birth date and divide by 86,400,000 (the number of milliseconds in a day). The 'total days lived' field in this calculator shows that number directly.
Does the age calculator account for leap years?
Yes. We use calendar-aware date arithmetic, so every February 29 is handled correctly. The total-days figure includes all leap days that occurred between your birth date and the age-at date.
Can I calculate age at a future date?
Yes. Change the 'Age At Date' to any future date and the calculator will tell you how old you will be on that day, plus how many days remain until then.
How is age in months calculated?
Months are counted as full calendar-month cycles between the two dates. For example, from January 15 to April 14 is 2 months and 30 days, not 3 months, because the 15th of April has not yet been reached.

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