Your life in years, months, weeks, and days — to the day.
Date of birth, and the date to measure to (today by default).
Counting down from today, using the birth date above.
The calendar gap between any two dates, in either order.
The age calculator turns two dates into an exact calendar age — years, then months, then days — plus running totals in months, weeks, days, and hours. It also counts down to your next birthday and measures the gap between any two dates. Like every Time Ledger tool, it runs entirely in your browser: the dates you enter are never sent anywhere.
Largest units first, borrowing where needed:
Years = whole years since birth Months = whole months since last birthday Days = days left over
Day counts borrow from the previous month's length, so month ends stay accurate.
Your birthday this year — or next, if it has passed:
Next = birthday in current year If already passed → add 1 year Days = Next − Today
February 29 birthdays fall on March 1 in non-leap years.
Flat counts come straight from the day difference:
Days = (To − From) in days Weeks = Days ÷ 7 Hours = Days × 24
A 26-year-old has lived roughly 9,690 days — about 232,000 hours.
Age is counted in calendar units, largest first: whole years since your birth date, then whole months since your most recent birthday, then the leftover days. When the day-of-month math goes negative, the calculator borrows the actual length of the previous month — which is why it stays correct across 28-, 30-, and 31-day months.
The line under your exact age shows your total days, along with totals in months, weeks, and hours — all counting from your date of birth to the "as of" date. Change the second date to measure your age at any point in the past or future.
Leap-day birthdays are handled with the most common convention: in non-leap years your birthday is treated as March 1 (the day after February 28), and in leap years it falls on February 29 as normal. Some jurisdictions use February 28 instead — if that matters for a legal purpose, check the local rule.
Because months are different lengths, "1 month" spans 28 to 31 days depending on where it starts. That's why age and date differences are expressed in calendar units directly instead of being converted from a flat day count — and why two people the same number of days apart can differ in months-and-days form.
Same family, different scale: this page counts calendar time in dates, while the work hours calculator and hours & minutes calculator work within the day, and the time card calculator turns a week of clock times into pay.
Results are estimates for general guidance only and are not professional advice. Please double-check anything that affects pay, safety, or spending — see our full disclaimer.