Age Calculator
Find your exact age in years, months, and days — or calculate age as of any past or future date.
How this calculator works
Enter a date of birth and this tool calculates the exact age by counting full years, months, and remaining days between two calendar dates — accounting for varying month lengths and leap years. Switch to "Age on a specific date" to find out how old someone was, or will be, on any date — useful for legal forms, eligibility checks, or just curiosity.
Frequently asked questions
How is age calculated from a date of birth?
Age is calculated by counting the number of complete years, months, and days between the date of birth and the target date (today, or any date you choose). Because months have different lengths and some years are leap years, this calculator does the day-by-day counting for you instead of relying on a simple subtraction.
Can I calculate age without knowing the exact birth date?
Yes. If you only know the birth year, the calculator shows an age range covering every possible birth date in that year. If you know the year and month, it narrows the range further. Adding the exact day gives a precise age.
Can I find out how old someone was on a past or future date?
Yes. Switch to "Age on a specific date" and enter any date — past or future. This is useful for checking eligibility cutoffs, legal age requirements, or planning ahead.
Is my birth date stored or shared anywhere?
No. All calculations run locally in your browser. The dates you enter are never sent to or stored on AuraTech's servers.
How much sleep do you need by age?
Sleep needs change throughout life. Here's the general guidance from sleep health organizations:
| Age group | Recommended sleep |
|---|---|
| Newborn (0–3 months) | 14–17 hours |
| Infant (4–11 months) | 12–16 hours |
| Toddler (1–2 years) | 11–14 hours |
| Preschool (3–5 years) | 10–13 hours |
| School age (6–12 years) | 9–12 hours |
| Teen (13–18 years) | 8–10 hours |
| Adult (18–64 years) | 7–9 hours |
| Older adult (65+ years) | 7–8 hours |