Age Calculator
Calculate your exact age in years, months, and days from your date of birth, plus age in weeks, days, hours, and a next-birthday countdown.
ToolsSoup's Age Calculator is a free online tool that tells you exactly how old you are from your date of birth. Enter your birthday and instantly see your age in years, months, and days, plus the equivalent in total weeks, days, hours, minutes, and seconds, and a countdown to your next birthday. You can also calculate your age at any past or future date by changing the second field. Everything runs in your browser — no uploads, no sign-up, and your dates never leave your device.
What is an age calculator?
An age calculator works out the precise time between a date of birth and a chosen reference date — by default, today. Instead of guessing or counting on your fingers, it gives you a calendar-accurate age expressed as years, months, and days, accounting for the different lengths of months and for leap years. It also converts that span into total weeks, days, hours, minutes, and seconds, which is handy for milestones, paperwork, and curiosity alike.
How to calculate your age
Calculating your exact age takes just a moment — the result updates the instant you pick a date:
- Enter your date of birth in the first field.
- Leave the second field set to today to find your current age, or change it to calculate your age at any other date.
- Read your age in years, months, and days, then check the breakdown in weeks, days, hours, and a countdown to your next birthday.
How is age calculated in years, months, and days?
Your age is the time elapsed from your birth date to the reference date. The calculator subtracts the day, then the month, then the year, borrowing from the larger unit whenever a value would go negative — for example, if the reference day is earlier in the month than your birth day, it borrows days from the previous month. This calendar-based method gives a true age (the same one you would say out loud) rather than a rough estimate from dividing total days by 365, and it handles leap years and months of different lengths automatically.
Age calculator vs. date difference calculator
An age calculator is tuned for one date of birth and a reference date, so it labels the result as your age and adds a next-birthday countdown. A date difference calculator is more general: it measures the gap between any two dates without the birthday framing. Use this tool when you want to know how old someone is; reach for a date difference calculator when you simply need the span between two arbitrary dates.
Why use this age calculator?
- Shows your exact age in years, months, and days, not just a rounded number.
- Breaks your age down into total weeks, days, hours, minutes, and seconds.
- Counts down the days to your next birthday automatically.
- Lets you calculate age at any past or future date, not only today.
- Runs entirely in your browser — your birth date is never uploaded to a server.
- 100% free with no ads, sign-up, or limits, and a one-click clear to start over.
Frequently asked questions
How do I calculate my exact age?
Enter your date of birth and the tool instantly shows your age in years, months, and days based on today's date. It counts full calendar units and borrows correctly across months, so the result matches the age you would normally say.
Does the age calculator account for leap years?
Yes. Because it works with real calendar dates rather than a fixed 365-day year, leap years and months of different lengths are handled automatically, so your day and month counts stay accurate.
Can I calculate my age on a future or past date?
Yes. Change the "Age at date" field to any date you like — a future birthday, a past anniversary, or a specific deadline — and the calculator will show how old you were or will be on that day.
How is age in months or weeks different from age in years?
Age in years, months, and days is the calendar age you usually quote. Age in total months, weeks, days, hours, and seconds expresses that same span as a running total in a single unit, which is useful for baby milestones, statistics, or paperwork that asks for age in a specific unit.
Are my dates kept private?
Yes. All calculations run locally in your browser using JavaScript, so the dates you enter are never sent to or stored on any server.