Age Calculator
Calculate your exact age in years, months, and days.
What is Age?
The age calculator works out exactly how many years, months, and days have passed since a birth date, including the calendar-aware month boundaries.
How it works
It compares the birth date to the 'as of' date by walking year, month, then day, borrowing from earlier units the way calendar math requires.
- Enter your input. Type or paste your input into the field above — the tool responds instantly.
- Review the result. Output updates live as you type. Everything runs entirely in your browser.
- Copy or download. Use the Copy button to grab the result, or Download to save it as a file.
Examples
Exact age breakdown
Enter a birthday and today's date to get the precise age in years, months, and days — useful for forms, insurance, or eligibility checks.
Common mistakes
Timezone shifts changing the day
Someone born just before midnight can show a different age across timezones. The calculator anchors dates at midnight UTC to stay consistent.
Frequently asked questions
Does it account for leap-day birthdays?
Yes — February 29 birthdays are handled sensibly in non-leap years, and the day total is always exact.
Can I calculate age at a specific past date?
Yes, set a reference date other than today to find the age at any moment in the past.
Is the birth date stored anywhere?
No. Everything is computed in your browser and nothing is saved or uploaded.