The HN Solutions Age Calculator works out your exact age in years, months, and days from any date of birth. It also shows your age in total months, weeks, days and hours, the weekday you were born on, and a live countdown to your next birthday — all calculated instantly in your browser.
Why our age calculator is better
- 100% free and private — your date of birth never leaves your device; nothing is uploaded or stored.
- More than a number — get total months, weeks, days and hours, plus the exact day of the week you were born.
- Age on any date — calculate your age today or on a future or past date, perfect for forms, eligibility and milestones.
- Instant and accurate on mobile, tablet and desktop, with no sign-up and no ads in the way.
How to calculate your age
- Enter your date of birth.
- Leave the second date as today, or pick any date to calculate your age on.
- Your exact age and all the extra details appear instantly.
Frequently asked questions
How do I calculate my exact age?
Enter your date of birth and the tool instantly shows your age in years, months and days, with no manual math required.
Is this age calculator free?
Yes. It is completely free, needs no account, and has no usage limits.
Is my date of birth stored anywhere?
No. Everything is calculated locally in your browser, so your information is never uploaded or saved.
What day of the week was I born?
Along with your age, the tool tells you the exact weekday of your birth.
Can I calculate the age between two dates?
Yes. Set the second date to any day and the tool shows the exact age or time difference between the two dates.
Looking for more? Explore our full free tools hub.
Why your age is not simply years minus years
Subtracting birth year from current year gives the right answer only after your birthday has passed. Before it, you are a year younger than the arithmetic suggests — which is why forms that calculate age that way reject people incorrectly every January.
Exact age needs three comparisons: years, then months, then days, borrowing from the larger unit when the smaller one goes negative. That is what this tool does, and it is why the result includes months and days rather than a single rounded number.
Where an exact age is actually required
- Visa and immigration forms — many ask for age in years and months on a specific date, not today.
- School admissions — entry is usually decided by age on a fixed cut-off date rather than at application.
- Insurance and pensions — premiums and eligibility often turn on age at a policy date.
- Paediatric dosing and developmental milestones — measured in months, where a rounded year is useless.
- Sports eligibility — age groups are set by age on a specified date in the season.
All of these need age on a given date, not age now — which is why the second date field is editable rather than fixed to today.
The 29 February problem
Someone born on 29 February has a real birthday only every four years. In non-leap years, jurisdictions differ: some treat 28 February as the anniversary, some treat 1 March.
It matters for anything with a legal age threshold. If a date of birth falls on 29 February and a deadline sits at the end of February, check which convention applies rather than assuming.
Age reckoning is not universal
The system used across most of the world counts from zero at birth. It is not the only one — traditional East Asian age reckoning counted a newborn as one year old, with everyone gaining a year at new year, so a person could be “two” days after being born.
South Korea formally moved to international age counting in June 2023, which resolved a long-standing source of confusion in official documents. If you are working with historical records or older paperwork, the distinction still matters.
Calculated on your device
Your date of birth is never transmitted — the calculation happens in your browser and nothing is stored. For general date arithmetic and working-day counts, see days between dates.