Age Calculator
Enter a date of birth to see exact age in years, months, and days — plus next birthday countdown.
31
Years
1
Months
3
Days
Total days lived
11,356
Next birthday in
332 days
In-depth explanation
Age is calculated from your date of birth to today (or a custom end date), accounting for varying month lengths and leap years so the result is precise. Everything runs locally in your browser — your inputs are not uploaded to produce the result.
It calculates using calendar dates, so it accounts for different month lengths and leap years. The result is exact for the dates you enter. Choose a custom end date instead of today to find how old someone was (or will be) on that day.
Along with your exact age, you’ll see how many days remain until your next birthday. Tweak the inputs above to compare options, then copy or note the result you need.
Frequently asked questions
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