Age Calculator
Calculate your exact age in years, months, days, hours, minutes, and seconds. Live countdown to your next birthday.
How to Use the Age Calculator
1
Enter Your Birth Date
Use the date picker to select your date of birth. The date format adjusts automatically to your browser's locale.
2
Choose a Reference Date
The "As of Date" defaults to today. Change it to calculate your age on any past or future date.
3
See Instant Results
View your exact age in years, months, and days plus total months, weeks, hours, and minutes. The countdown shows time until your next birthday.
Age Calculation Reference
| Unit | Calculation | Example (30 years old) |
|---|---|---|
| Years | Date difference in years | 30 years |
| Months | Total months between dates | 360 months |
| Weeks | Total days / 7 | ~1565 weeks |
| Days | Exact day count including leap years | ~10,957 days |
| Hours | Days * 24 | ~262,968 hours |
Frequently Asked Questions
Your exact age is calculated by comparing your birth date to the current date (or a custom date). The calculator accounts for leap years and varying month lengths to give precise year, month, day, hour, minute, and second differences. The result updates in real-time if you enable live ticking.
Your age in months is the total number of complete months since birth. Age in weeks is the total days divided by 7. The calculator shows both total months and total weeks alongside the standard years-months-days display.
The next birthday countdown shows the exact number of days, hours, minutes, and seconds remaining until your next birthday. If today is your birthday, it congratulates you and shows the countdown to your next one.
Yes, you can change the 'as of' date to any past or future date to calculate age at a specific point in time. This is useful for calculating exactly how old someone was on a particular historical date or will be on a future date.
Leap years add an extra day (February 29) every 4 years. The JavaScript Date object handles leap years automatically. If you were born on February 29, your birthday is counted on March 1 in non-leap years for age calculation purposes.
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