Age Calculator
Calculate exact age in years, months and days from a date of birth, plus total weeks, days, hours, the weekday you were born and a countdown to your next birthday.
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How to: Age Calculator
- Enter the date of birth.
- Optionally change the “age on” date.
- See age in years, months, days and totals.
Calculating an exact age by hand is fiddly because months have different lengths and leap years add an extra day. This age calculator gives the precise age in years, months and days, plus totals in months, weeks, days and hours, the day of the week someone was born, and how many days remain until their next birthday.
Common uses
- Check eligibility for school entry, sports categories, visas, pensions or competitions on a cut-off date.
- Fill in forms that ask for age in years and months.
- Find out how many days old you are for a fun milestone like 10,000 days.
- Calculate the age of a company, building, pet or relationship.
Tips for best results
- Always use the cut-off date stated by the organisation, not today's date.
- Ages are calculated from calendar dates, so time zones do not matter.
- For age in another calendar system, convert the date first.
- Use the Date Difference Calculator for working days between dates.
How age is calculated
The calculator counts full years first, then full months, then remaining days, borrowing days from the previous month when needed – the same method used on official forms. For example, from 31 January to 1 March is 1 month and 1 day in a non-leap year. Totals such as days and weeks are exact counts of calendar days between the two dates.
Age conventions around the world
Most countries use the international age system shown here, where you are 0 at birth and gain a year on each birthday. South Korea officially switched to this system in 2023, replacing its traditional counting; parts of East Asia still use traditional reckoning informally. When forms ask for age, use the international system unless told otherwise.
Why use FreePDF for Age Calculator?
| FreePDF | Typical upload-based sites | |
|---|---|---|
| What you type is sent to a server | No – stays in your browser | Often |
| Sign-up required | Never | Often for bigger jobs |
| Hourly / daily task limits | None | Common on free plans |
| Works offline after loading | Yes, for most tools | No |
Frequently asked questions
How are leap-year birthdays handled
For people born on 29 February, the next birthday in non-leap years is shown as 1 March, the rule used in many countries' laws. Some places use 28 February instead.
Can I calculate age on a past or future date
Yes. Change “Age on date” to find how old someone was or will be on a specific day, for example an exam cut-off date.
Is Age Calculator really free?
Yes. Every tool on FreePDF is 100% free with no file limits, no sign-up and no watermarks. The site is supported by unobtrusive ads.
Are my files uploaded to a server?
No. FreePDF processes your files directly in your browser using JavaScript. Your documents never leave your device, so they stay completely private.
Does it work on mobile?
Yes. FreePDF works in any modern browser on Android, iPhone, iPad, Windows, Mac and Linux.