Age Calculator
Enter a date of birth to see an exact age in years, months and days, the date and weekday of the next birthday and how many days remain, and the same age in total months, weeks and days. You can measure to any date, not only today, to find the age on a past or future day. Everything runs in your browser.
Enter a date of birth to see the age in years, months and days.
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Student ToolsAbout the Age Calculator
The Age Calculator finds the whole years, months and days from a date of birth to a chosen date, which is today unless you pick another. A month is counted from the same day number, so someone born on 31 January reaches one month on 28 February in a normal year, because adding a month to 31 January gives the last day of February. The next birthday is the first one on or after the chosen date, and a birthday today counts as zero days to go. A 29 February birthday is placed on 28 February in years that have no 29 February, which is one common convention, and some places use 1 March instead, so check the rule that applies to you for legal purposes. The totals in months, weeks, days and hours are for whole days: the hours are the days multiplied by 24, with no time of day or time zone involved. The calculations were compared with Python's datetime and dateutil on 30,000 random date pairs and matched every time. Everything runs in your browser and nothing is uploaded.
How do I calculate my exact age?▾
Count the whole years from your birthday to the date you are measuring to, then the whole months after that birthday, then the days left over. Enter your date of birth in the tool and it gives the years, months and days at once, as of today or of any date you choose.
How old will I be on a certain date?▾
Enter your date of birth, then put that date in the Age on box. The tool shows your age on that day in years, months and days, which is useful for forms, exams and age limits.
When is my next birthday?▾
The tool shows the date and weekday of your next birthday and the number of days to go. If your birthday is today it says Today. For a 29 February birthday it uses 28 February in years that have no 29 February.
How many days old am I?▾
The In days box gives the number of whole days from your date of birth to the chosen date, along with the same age in weeks and months. Multiply the days by 24 for the hours, which the tool shows as an approximation.
Is my date of birth uploaded?▾
No. The calculation runs in your browser, and your date of birth is not sent anywhere or stored.