Age Calculator – Calculate Your Exact Age
Calculate your exact age in years, months and days from any date of birth — free, private, no signup required.
Your date is processed entirely in your browser and is never uploaded or stored.
How it works
Enter your date of birth
Use the date picker or type the date directly. No account or personal details required.
Choose a comparison date
By default we calculate your age as of today. Switch to "Age on a date" to check your age on any other day.
Get your exact age
See your age in years, months and days, plus total months, weeks, days, hours and your next birthday countdown.
A simple and free way to calculate your age
TickmarkTools' Age Calculator makes it easy to find your exact age from your date of birth. Instead of manually counting years, months and days on a calendar, enter your date of birth once and the calculator handles the arithmetic for you.
The result isn't limited to a single number. Alongside your age in years, months and days, the calculator shows your age broken down into total months, total weeks, total days and total hours — plus the exact date of your next birthday and how many days remain until it. You can use it to check your current age, plan around an upcoming birthday, or work out how old you were, or will be, on any other date.
How is age calculated?
Your age is found by comparing your date of birth with the date you want to calculate against — usually today. The calculator first counts the number of complete years between the two dates, then works out the remaining months, and finally the remaining days once those full months are accounted for.
This calendar-based approach matters because months don't all have the same number of days, and leap years add an extra day roughly every four years. A simple "days ÷ 365" estimate can drift off by a day or more over a long enough span. TickmarkTools instead walks the actual calendar dates, so the year/month/day breakdown lines up with a calendar the way a person counting by hand would get it — including for people born on February 29.
Age calculator examples
A few worked examples of how a date of birth translates into an age. Enter your own date of birth above for your exact result.
| Date of birth | Calculated as of | Result |
|---|---|---|
| 15 April 1995 | Today | Age in complete years, months and days since that date |
| 1 January 2000 | Today | Age in complete years, months and days since that date |
| 29 February 2012 | Today | Age calculated correctly despite the leap-year birth date |
Answers
What is an Age Calculator?
An age calculator works out the exact time that has passed between a date of birth and another date — usually today — expressed in years, months, days, and other useful units such as total weeks or hours.
How does the Age Calculator work?
It takes your date of birth and a target date, then counts complete years, months and remaining days between the two using calendar-based logic rather than a fixed 365-day estimate.
How accurate is this calculator?
The year/month/day breakdown is calculated using exact calendar arithmetic, correctly accounting for varying month lengths and leap years — it is not an approximation.
Can I calculate my age on a specific date?
Yes. Switch to "Age on a date" and enter any target date to see how old you were, or will be, on that day.
How does the calculator handle leap years and February 29 birthdays?
Leap years are handled automatically through standard calendar arithmetic. If you were born on February 29, your age still advances correctly each year, using the nearest valid calendar date where relevant.
How old am I?
Enter your date of birth above and select "Age as of today" — the calculator instantly shows your exact age in years, months and days based on today's date.
How many days, weeks or months old am I?
Once you calculate your age, the stat grid below the result shows your total months, total weeks, total days and total hours lived — the same span of time expressed in different units.
Why use TickmarkTools Age Calculator?
Free
Calculate your age as many times as you like, with no cost and no hidden limits.
Fast
Get your exact result the moment you enter a date of birth — no waiting, no page reload.
No signup
There's no account to create and nothing to remember. Open the page and start calculating.
Multiple time units
See your age in years, months and days, plus total months, weeks, days and hours in one result.
Works everywhere
The calculator is built mobile-first, so it works the same on a phone, tablet or desktop.
Private by design
Your date of birth is processed in your browser and is never uploaded or stored on TickmarkTools' servers.
What can you use an age calculator for?
- Checking your current exact age in years, months and days
- Finding out how many days are left until your next birthday
- Calculating how old you were, or will be, on a specific date
- Working out someone else's age from their date of birth
- Converting an age into total days, weeks, months or hours
- Comparing dates when planning events, milestones or eligibility
Frequently asked questions
Does this tool store or upload my date of birth?
No. The calculation runs entirely in your browser. Your date of birth is never sent to TickmarkTools' servers or stored anywhere.
Why do total days and total months look different from my age in years?
Your age in years, months and days is a calendar breakdown, while total days, weeks, months and hours are the full count of that unit across your entire lifespan — both describe the same span of time in different ways.
What happens if I enter a future date of birth?
The calculator shows an error, since a date of birth in the future can't produce a valid age.
Can I find out how many days are left until my next birthday?
Yes. Every result includes your next birthday date and the exact number of days remaining until it.
Can I calculate my age on a future date?
Yes. Switch to "Age on a date" and choose any future date to see how old you'll be on that day.
Is the Age Calculator free to use?
Yes. TickmarkTools' Age Calculator is free to use, with no limit on how many times you can calculate.
Do I need to sign up or create an account?
No. You can use the calculator immediately without creating an account or providing any personal details.
Does the calculator work on mobile devices?
Yes. The page and calculator are built mobile-first, so they work the same way on a phone, tablet or desktop.
About TickmarkTools
TickmarkTools is a collection of free, browser-based online tools for calculations, PDFs, images, text and code. Each tool is built to give a useful result quickly, without unnecessary sign-ups or clutter between you and the task in front of you.