Age Calculator

Calculate your exact age in years, months, weeks and days. Enter your date of birth below for instant results. You can also calculate the age between any two dates.

๐Ÿ“… Calculate Your Age

Date of Birth

Age At Date (leave blank for today)

Your Age

How the Age Calculator Works

Our age calculator computes the precise difference between your date of birth and today's date โ€” or any reference date you choose. It breaks your age down into years, months and remaining days, then converts the total into weeks, days and hours for a complete picture.

Age Formula

Age is calculated using the following approach:

Age (Years) = Reference Date โˆ’ Date of Birth
If birthday has not yet occurred this year: Age = Full Years โˆ’ 1

Total Days  = (Reference Date โˆ’ Date of Birth) in days
Total Weeks  = Total Days รท 7
Total Months = (Years ร— 12) + Remaining Months
Total Hours  = Total Days ร— 24

Leap Year Handling

The calculator automatically accounts for leap years. People born on 29 February have their birthday counted on 28 February in non-leap years, which is the standard legal convention in most countries.

Time Zone Note

All calculations are based on calendar dates only and do not factor in time zones or the exact time of birth. Results reflect the number of complete years, months and days elapsed.

Understanding Age Calculation

Age is the amount of time that has elapsed since a person's birth. In most countries it is expressed as the number of complete years lived. However, age can also be expressed in months (for infants), weeks or total days โ€” all of which this calculator provides instantly.

Why Calculate Your Exact Age?

Different Ways to Express Age

While "years old" is the most common way to state age, different contexts call for different units. Paediatricians track infant growth in months and weeks. Insurance actuaries work in exact days. This calculator gives you all of these in one place with no extra effort.

Frequently Asked Questions

How do I calculate my exact age in days? +

Subtract your date of birth from today's date to get the total number of days you have been alive. Our calculator does this automatically โ€” just enter your date of birth and click Calculate Age to see your total days, weeks and hours.

Can I calculate the age between two specific dates? +

Yes. Enter a date of birth in the first field and set the "Age At Date" field to any date of your choice. The calculator will compute the age as it was โ€” or will be โ€” on that specific date rather than today.

What if I was born on 29 February (leap day)? +

If you were born on 29 February, the calculator treats 28 February as your birthday in non-leap years. This is the standard convention used by most countries and legal systems.

How many weeks old am I if I am 30 years old? +

Approximately 1,565 weeks, depending on the exact number of leap years in your lifetime. A 30-year span contains around 10,950 to 10,958 days, which divided by 7 gives roughly 1,564 to 1,566 weeks. Use the calculator with your exact birth date for a precise figure.

Is the age calculator free to use? +

Completely free. There is no sign-up, no account, no tracking and no hidden cost. You can use the calculator as many times as you like on any device.

How is the next birthday countdown calculated? +

After calculating your age, the calculator checks whether your birthday has already occurred in the current year. If it has, it looks ahead to next year. The number of days until your next birthday is then shown in the result.

Does the calculator work for historical or future dates? +

Yes. You can enter any historical date of birth and a future reference date to project someone's age at that point in time. The calculator accepts any valid calendar date in both fields.

Related Calculators