Age Calculator
Calculate age online from a date of birth. The tool gives the exact age in years, months and days, plus the total number of days and weeks lived and how many days remain until the next birthday.
FreeOnline Tool
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How to Use
- Pick or type the date of birth in the "Date of birth" field
- Choose the target date in the "Calculate to" field, which defaults to today; you can also click the "Today" button to set it to the current date
- Results refresh in real time, with nothing else to click
- The result area shows the exact age (years, months and days) plus three summary cards: total days, total weeks and days until the next birthday
Features
- Calculates the exact age in years, months and days, borrowing from the previous month automatically when the day of the target date is earlier than the day of birth
- Calculates the total number of days and weeks between the date of birth and the target date
- Calculates how many days remain until the next birthday, rolling over to the following year when the target date is the birthday itself
- A "Today" shortcut button sets the target date to the current date in one click
- Validates that the date of birth is not later than the target date, so you never get a negative age
Use Cases
Getting an exact age
Check an age down to years, months and days when filling in an ID form, a resume or an application.
Counting days and weeks lived
Find out how many days or weeks have passed since you or your baby was born, as a milestone or growth record.
Birthday countdown
See how many days remain until the next birthday so you can plan the celebration or set a reminder.
Age at any given date
Set the target date to any past or future day to find someone's age then, such as at school enrollment or retirement.
FAQ
How is the age calculated?
It counts the complete years, months and days elapsed between the date of birth and the target date, borrowing from the previous month when the day of the target date is earlier than the day of birth, which gives an exact three-part result.
Can I calculate an age for a past or future date?
Yes. The "Calculate to" field defaults to today but can be set to any date, earlier or later, and the tool works out the age as of that date.
How is the countdown to the next birthday calculated?
The tool rebuilds the birthday in the year of the target date. If that date is already on or before the target date, it rolls forward to the next year, then measures the number of days from the target date.
What if the date of birth is later than the target date?
The page warns that the date of birth cannot be later than the target date, so no incorrect negative result is produced.