Defaults to today. Change it to check an age at any past or future date.
The Age Calculator turns a date of birth into an exact chronological age: how many years, months, and days have passed between that date and today, or between that date and any other date you choose. It also reports cumulative totals — total months, weeks, days, hours, and minutes lived — the weekday you were born on, and how many days remain until your next birthday.
Age arithmetic looks trivial until you try to do it properly. Months have different lengths, leap years insert an extra day roughly every four years, and there is no single answer to "how many days is one month". This calculator borrows days from the actual length of the month preceding the target date rather than assuming a 30-day or 30.44-day average, so the years/months/days breakdown matches the way a calendar actually works and the way registrars, HR systems, and courts count age.
Everything runs in your browser. No date of birth is uploaded, logged, or stored anywhere, which matters because a date of birth is a piece of personal data that identity-theft checks routinely ask for. Once the page has loaded, the tool keeps working with no network connection, and results appear instantly as you change either date.
Type or pick the date of birth in the first field. Any calendar date works, including 29 February and dates well over a century in the past.
The second field defaults to today. Change it to calculate age at a past or future date — a policy start date, an exam cut-off, a wedding, or a retirement date.
The headline shows years, months, and days. Below it you get total months, weeks, days, hours and minutes, the weekday of birth, and the date and weekday of the next birthday with days remaining.
Copy the full age summary to the clipboard for a form, an email, or a record, or change either date to run another calculation instantly.
Days are borrowed from the real length of the preceding month, so the breakdown never drifts the way average-month approximations do
Leap days are counted, and a 29 February birthday resolves to 1 March in non-leap years — the convention used by most common-law jurisdictions
Total months, weeks, days, hours, and minutes lived, all derived from the exact number of calendar days rather than an average year length
Shows the date of the next birthday, the weekday it falls on, the age being turned, and the number of days remaining
Calculate the exact time between two dates: years, months, days, and business days
Calculate percentages three ways — what is X% of Y, X is what percent of Y, and percentage increase or decrease between two numbers.
Convert between Unix timestamps and human-readable dates
0 comments
No comments yet. Be the first to share your thoughts!