🎂 Age Calculator

The Age Calculator works out an exact age — in years, months and days — between a date of birth and any target date. It correctly accounts for leap years and the different lengths of months, so the result matches how age is actually counted rather than a rough "days ÷ 365" estimate.

How to Use This Tool

Pick the date of birth. Optionally pick a second date to calculate the age "as of" that day; leave it blank to use today. The tool shows the full breakdown in years, months and days, plus the total days.

What This Tool Checks

A true calendar difference: it counts complete years, then complete months, then remaining days, borrowing correctly across month and year boundaries and handling February and leap years.

Understanding Your Results

The primary result is the conventional age (completed years). The months-and-days remainder is the time since the last birthday. The total-days figure is handy for milestones ("10,000 days old") and for medical or legal contexts that count in days.

How to Fix Common Problems

If the result seems off by a day, check both dates are correct and in the right fields — the date of birth goes first. Timezones do not affect a pure date calculation, so the same inputs always give the same answer.

SEO Best Practices

For eligibility checks (voting, driving, retirement) set the target date to the relevant deadline rather than today. For anniversaries and countdowns, the total-days figure is often more useful than years and months.

Example

Someone born 15 March 2000, calculated as of 12 September 2026, is 26 years, 5 months and 28 days old — regardless of how many leap years fell in between, because the tool counts real calendar units.

Common Mistakes to Avoid

Estimating age as days ÷ 365 drifts by several days over a lifetime because it ignores leap years. Entering the dates in the wrong order gives a negative or zero result.