Age Calculator
Find an exact age in years, months and days, plus days until the next birthday.
Calculators
DOB → AGE
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How old is someone, exactly? This calculator takes a birth date and an optional target date and returns the precise age in years, months and days — accounting for leap years and varying month lengths — plus a countdown to the next birthday.
How to calculate an age
- Enter the date of birth.
- Leave the target date as today, or set a custom date to calculate age on that day.
- Read the exact age in years, months and days.
- See total days lived and days until the next birthday.
What it reports
| Output | Example |
|---|---|
| Exact age | 34 years, 2 months, 11 days |
| Total months | 410 months |
| Total days | 12,490 days |
| Next birthday | in 49 days |
Calculator features
- Exact breakdown into years, months and days.
- Correctly handles leap years and month lengths.
- Age as of any custom date, not just today.
- Countdown to the next birthday.
Frequently asked questions
Does it account for leap years?
Yes. The calculation uses real calendar dates, so 29 February and differing month lengths are handled correctly.
Can I calculate age on a past or future date?
Yes — set the target date to any day to find how old someone was, or will be, then.
Why might months and days look unusual?
Because months vary in length, the day count rolls over against the actual month, which is the accurate way to express a partial month.