Filling an official form
Before
Needed exact age in years and months
After
Got the exact breakdown instantly
Manual counting had me off by a month. The tool handled the month-length math correctly.
All Tools
Age Calculator – Exact Age from Date of Birth
I built this when filling out a form that needed my exact age in years and months — and I kept getting the month math wrong. Enter your date of birth, get the exact breakdown. It handles leap years and month lengths correctly.
100% free, no signup
26
Years
8
Months
15
Days
107
Days to next birthday
You've lived approximately 9,755 days (1,393 weeks).
Downloadable PDF age report with milestones
Your files are processed in your browser and never uploaded to any server.
A note from me
The tricky part of age calculation is leap years and month lengths. February 29 birthdays are the classic edge case — different systems handle them differently. This tool treats February 29 as February 28 in non-leap years, which is the standard convention for most legal and official purposes. For medical or legal documents, confirm with the specific jurisdiction what they expect.
— Mirza Noman Baig
How to use this tool
- 1Enter your date of birth.
- 2Optionally change the calculation date.
- 3See your exact age in years, months, and days.
- 4Check total days lived and countdown to next birthday.
Real results from testing
These are actual measurements from using this tool, not estimates.
Checking eligibility
Before
Was I old enough for a program on the cutoff date?
After
Calculated age as of the specific date, not today
Turned out I was 2 days short. Would have missed that doing it by hand.
Planning a birthday
Before
Wanted to know exactly how many days until the next birthday
After
Precise countdown
Simple, but useful. Helped plan a surprise party on the right weekend.
Age Calculator features
Exact age breakdown
Years, months, and days — with correct leap year handling.
Total time lived
See total days, weeks, and months.
Next birthday countdown
Days remaining until your next birthday.
Runs locally
Your date of birth never leaves your browser.
Frequently asked questions
Does it handle leap years?+
Yes. February 29 birthdays are treated as February 28 in non-leap years, which is the standard convention.
Is my date of birth stored?+
No. Everything runs in your browser. Your DOB never leaves your device.
Can I calculate age as of a specific date?+
Yes. Change the calculation date to any past or future date.
How is total days lived calculated?+
It counts every day between your birth date and the calculation date, including leap days.
Is this accurate for legal purposes?+
It uses standard conventions for age calculation. For legal documents, confirm with the specific jurisdiction — some have unusual rules for leap year birthdays.