Date & Time
Age Calculator
Age — age Calculator measures the span between dates in years, months and days using calendar arithmetic. This page runs that same calculation on your numbers, in your browser: no signup, no uploads, nothing stored.
From your date of birth and as of date, Age Calculator computes the age or time remaining, to the day via calendar date arithmetic. No accounts, no uploads — just an instant way to work out an exact age or countdown.
About this calculator
Get age right and the rest of the task gets easier. Age Calculator measures the span between dates in years, months and days using calendar arithmetic. It matters whenever spans between dates, times or zones drive a plan, a deadline or a record. Take a birth date of 15 June 1990 and a calculation date of 27 June 2026. Counting full years gives 36 years, then the remaining days from 15 June to 27 June add 12 days — so the result is 36 years and 12 days . The tool also totals this as days, weeks and months for you. The tool above does the same computation in your browser — free, private, nothing stored.
How to use
- Enter the date of birth (DOB).
- Set the as-of date, or leave it blank for today.
- Press Calculate to compute the age.
- Read the age in years, months, and days plus total days, weeks, and hours.
Why use Age Calculator
Fast
Calculations run in your browser. No round trip to a server.
Private
Your inputs never leave your device. Nothing is uploaded.
Free
No signup, no paywall, no ads-in-results, no watermarks.
Accurate
Works out age in years, months and days with calendar arithmetic, including leap years. Double-check the dates you enter; results are not adjusted for time zones.
Mobile-ready
Optimised for phones, tablets, and desktops alike.
Transparent
Honest disclaimers wherever browser limits or regional rules apply.
Common uses
Use it for age in years, months and days
Use it for an age-on-a-past-date check
Use it when comparing two people's ages
Use it for a quick age calculation
Use it when filling an age field on a form
Use it when working out an exact age
Technical notes
Age Calculator measures the span between dates in years, months and days using calendar arithmetic.
Calculations use the calendar only and do not adjust for time-zone shifts unless a field asks for a zone.
Because it runs locally, results appear instantly with no server round-trip.
Worked example
Take a birth date of 15 June 1990 and a calculation date of 27 June 2026. Counting full years gives 36 years, then the remaining days from 15 June to 27 June add 12 days — so the result is 36 years and 12 days. The tool also totals this as days, weeks and months for you.
FAQ
Can I calculate age as of a specific date?
Yes. Set the as-of date to any day and the age is computed for that date; leave it blank to use today.
How are months and days counted?
Age is shown in whole years, months, and days using calendar months, matching how birthdays are normally counted.
What totals are included?
Alongside years, months, and days you get the total number of days, weeks, and hours as of the chosen date.
Does the Age Calculator send my data to a server?
No. The Age Calculator runs entirely in your browser — your inputs never leave your device, and nothing is uploaded or stored.