Age Calculator — what it does
Works out an exact age in years, months and days from a date of birth — and doubles as a date-difference calculator for any two dates. Built for form-filling (school admissions, visa applications, government portals that want age in completed years), eligibility checks, and the perennial 'how old exactly am I today'.
How to use Age Calculator
- Pick the date of birth from the calendar field.
- Set the 'age at date' — it defaults to today, which is what most forms want.
- Read the exact age in years, months and days, plus the total days lived.
- Optional: check the next-birthday panel to see how many days remain and which weekday it falls on.
- Need it for two people? Open a second tab — each tab keeps its own dates.
Worked example: a school admission cutoff
A portal says the child must be 6 completed years on 31 March. Enter the birth date, set the 'age at date' to 31 March of the admission year, and the tool shows whether the age crosses 6 years 0 months 0 days — including the day arithmetic ('completed years') that parents most often get wrong when counting on their fingers.
At a glance
| Output | Exact years, months, days; total days; next-birthday countdown |
|---|---|
| Also computes | Day of the week for the birth date; age on any past or future date |
| Runs where | Entirely in the browser — no date ever leaves the device |
| Limits | Calendar (Gregorian) arithmetic only; it does not handle time zones or birth times |
| Privacy | Nothing is stored or sent — closing the tab clears everything |
Frequently asked questions
- What is Age Calculator?
- Your exact age in years, months and days — plus total weeks, hours, minutes and a countdown to your next birthday.
- Is Age Calculator free to use?
- Yes — Age Calculator is free to use, with no sign-up, no install and no account.
- Does Age Calculator upload or store my data?
- No — Age Calculator runs entirely in your browser, so your text, files and results never leave your device.
- Do I need to install anything to use Age Calculator?
- No — it works in any modern browser (Chrome, Edge, Firefox, Safari) with no downloads, accounts or plugins.
- How is a 'completed' age different from the age I normally count?
- Forms usually want completed years: on your 25th birthday you have completed 25 years, but the day before it you have completed only 24. The calculator counts the full years, months and days that have actually elapsed, which is the number official forms ask for.
- Does it account for leap years?
- Yes. The day-level arithmetic uses the real calendar, so 29 February birthdays and leap-day-included periods come out correctly.
- Can I calculate age at a past date, like on a specific exam day?
- Yes — change the 'age at date' field to any past or future date instead of today.