Age Calculator
Enter your date of birth and instantly see your exact age in years, months and days — plus your total days lived.
What is the Age Calculator?
An age calculator sounds simple until you try the math by hand. Subtracting dates means wrestling with leap years, months of different lengths, and whether February had 28 or 29 days in a given year — and one small slip gives you the wrong answer. The MuftTools Age Calculator does this calendar arithmetic perfectly in a fraction of a second, giving you your exact age broken down into years, months and days.
People reach for an age calculator more often than you'd think: filling in official forms, checking school admission or job eligibility, planning retirement, verifying insurance details, or simply settling a friendly debate about who's older. It can also tell you your age on any past or future date — handy for anniversaries and milestones. Everything runs privately in your browser, so your date of birth is never uploaded or stored anywhere.
How to use the Age Calculator
- Enter your date of birth using the date picker.
- Optionally choose a different “age at” date to see how old you were — or will be — on that day.
- Click the Calculate button.
- Read your exact age in years, months and days, plus your total days lived.
Key features
- Exact breakdown in years, months and days
- Leap-year-aware calendar math for correct results
- “Age at any date” mode for past and future dates
- Total days lived, shown alongside the breakdown
- Works for any date — past, present, or future
- 100% private — your birth date never leaves your device
Frequently asked questions
How accurate is the Age Calculator?
Completely accurate for the date you enter. It uses precise calendar arithmetic, including leap years and varying month lengths, so the result is exact down to the day.
Does it account for leap years?
Yes. Leap years are fully factored into every calculation, which is exactly where manual math usually goes wrong.
Is my date of birth stored or sent anywhere?
No. The calculation happens entirely inside your browser. Nothing is uploaded, saved or tracked — close the tab and it's gone.
Can I calculate someone's age on a past or future date?
Yes. Use the “age at” option to pick any date and see the exact age on that day — useful for historical records or upcoming milestones.