Age Calculator — Your Exact Age Today
Enter a date of birth to see an exact age today, the total number of days lived and how long until the next birthday. Also handy for checking eligibility dates, anniversaries and how old a pet really is.
Age Calculator
Exact age and days to next birthday
How it works
- Ages account for leap years and differing month lengths.
- Also useful for pets, anniversaries and eligibility dates.
- Total days lived is exact — months and days follow calendar months, not 30-day blocks.
- The birthday countdown counts calendar days to the next occurrence of your birth date.
Worked example: born 15 March 1990, today 25 September 2026
- 1Full years: from 15 March 1990 to 15 March 2026 = 36 years.
- 2Months since the last birthday: March to September = 6 months.
- 3Days: 15 to 25 September = 10 days.
36 years, 6 months and 10 days old
Days lived by milestone age
| Age | Days lived (approx.) |
|---|---|
| 1 year | 365 |
| 10 years | 3,652 |
| 18 years | 6,574 |
| 30 years | 10,957 |
| 50 years | 18,262 |
| 80 years | 29,220 |
Includes the leap days that fall within each span.
Frequently asked questions
How many days old am I?
Enter your date of birth above and the total days lived appears instantly, leap years included.
How is age calculated across leap years?
The calendar method counts full years and months first, then the remaining days, so 29 February birthdays are handled correctly — in non-leap years the birthday is usually observed on 28 February or 1 March.
Can I calculate age at a past or future date?
Yes — use the date difference calculator to measure the gap between your birth date and any other date, in days, weeks and months.
What is my age in weeks or hours?
Divide your total days by 7 for weeks, or multiply by 24 for hours. Someone 10,000 days old is about 1,428 weeks or 240,000 hours old.
Use it without ads
QuickCalc Pro is a one-time $4.99 payment: no ads anywhere, and you can save any calculation and open it again on any device.
30-day money-back guarantee · Secure checkout by Paddle