Age Calculator: How Old Am I Exactly?

This age calculator works out your exact age in years, months and days from your date of birth. Beyond the basic number, it shows how many days and hours you have lived, when your next birthday is and how many days are left until it, and which day of the week you were born on.

How to use the age calculator

1. Enter the date of birth.
2. Leave the second date on today, or change it to any other date.
3. Read the age in years, months and days.
4. Scroll to the extras: total days and hours lived, next birthday and the weekday of birth.

Changing the second date is what makes the tool more than a curiosity. You can find out how old someone will be on a future date, or how old they were on a date in the past.

What you get

• Exact age in years, months and days
• Total days and hours lived, a fun number for milestones like your 10,000th day
• Next birthday with its date and the number of days left
• Day of the week you were born, for example Tuesday

Leap-day birthdays

People born on February 29 only see their actual birthday once every four years. In common years, the calculator treats February 28 as the birthday, so the age changes on February 28 and the next-birthday countdown points to that date. Some people prefer to celebrate on March 1, and legal rules for leap-day birthdays can differ by place, so if the exact day matters for an official purpose, check the relevant rules.

Why exact age calculations matter

Counting age seems simple until you need precision. Months have different lengths, so “2 months and 3 days” depends on which months are involved. The calculator uses the real calendar, so the result matches what you would get by counting carefully by hand.

• Forms and applications: fill in your exact age when a form asks for it.
• Eligibility checks: see whether someone will have reached a certain age by a cutoff date, such as a school start or a sports season. Always confirm the official rules.
• Retirement planning: find the date you reach a particular age.
• Children and babies: age in months and days is often more useful than years.
• Fun facts: how many days you have been alive, or the weekday of your birth.

Make it a countdown

Once you know your next birthday, you can turn it into a live birthday countdown on tempoo, share the link with friends or add the date to your calendar. It is a simple way to make sure nobody forgets the day.

A small tip: if you are checking an age for someone else, for example a child’s age on the first day of school, enter that exact date as the second date rather than today. The result then reflects the moment that actually counts, and you avoid being off by a few days or months near a birthday.