Jack Tools

Age Calculator

Calculate exact age in years, months, days, hours, and time until the next birthday.

Enter age details

Include time of birth Switch this on to calculate hours and more precise age differences.
Include comparison time Useful when you want a more exact age at a specific hour and minute.

Enter a date of birth and comparison date to calculate exact age and time until the next birthday.

Exact age
0 years, 0 months, 0 days
Born on —
Total months
0
Total weeks
0
Total days
0
Total hours
0

Age breakdown

Day of week born —
Next birthday —
Days until next birthday 0
Comparison date used —

How This Age Calculator Works

This age calculator works out the exact difference between your date of birth and a comparison date.

It can show age in years, months, days, weeks, and hours, depending on whether you choose to include birth time and comparison time in the calculation.

The calculator also shows useful extra details, including the day of the week you were born, your next birthday, and how many days remain until it arrives.

This makes it useful for birthdays, official forms, planning milestones, and checking exact age on a past or future date.

Date of birth The starting date used to calculate exact age.
Time of birth Optional birth time for more precise age calculations in hours and minutes.
Comparison date The date on which you want to calculate age, which can be today or any other date.
Next birthday Shows when the next birthday falls and how many days remain until then.
Back to calculator ↑

Example Age Calculations

Basic birthday check
Date of birth15 June 1995
Compare on15 June 2025
Result30 years
Exact birthday reached
Before next birthday
Date of birth10 October 2000
Compare on1 July 2025
Result24 years
Birthday still ahead
Using birth time
Date of birth2 March 2010
Birth time08:30
More preciseYes
Hours included
Future date check
Date of birth1 January 1990
Compare on1 January 2030
Result40 years
Useful for planning milestones

Age Calculator FAQs

Age is calculated by comparing the date of birth with the comparison date and measuring the full difference in years, months, and days.
Yes. You can switch on time of birth to get a more precise result in hours and to calculate age more accurately at a specific time.
Yes. You can choose any comparison date, including a future date, to work out how old someone will be at that point.
Yes. The calculator shows the next birthday and how many days remain until it arrives.
That is fine. You can leave the time settings off and the calculator will still give an exact date-based age in years, months, and days.
It is useful for general planning and reference, but for legal, medical, or official purposes you should always confirm requirements with the relevant organisation.

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