Calculate your exact age in years, months and days, plus total days lived and your next birthday.
The Age Calculator tells you exactly how old you are — or how old anyone or anything is — down to years, months and days. Enter a birthdate and a target point in time, defaulting to today, and the calculator works out the precise difference, accounting for leap years, different month lengths, and whether the birthday has passed in the current year. The result also includes bonus stats: total days, weeks and hours lived, and a countdown to the next birthday.
The "Age as of" field makes the calculator more flexible than a simple birthday counter. Set it to a future point in time to find out how old someone will be on a specific occasion, or a past point to check how old someone was at a historical moment. Nothing you enter is sent to any server — all the arithmetic happens locally in your browser.
Reviewed by the ToolBrainy Team · Calculations run entirely in your browser · Last updated July 2026
Click the Date of Birth field and pick a date from the calendar, or type it directly in your browser's date format. The calculator accepts any date going back centuries.
The "Age as of" field defaults to today, so you can skip this for a current age. Change it to a future date to find out how old someone will be at a specific event, or a past date to look up a historical age.
Click Calculate Age to see the exact breakdown — years, months, and days — along with total days, weeks, and hours lived, and the number of days until the next birthday.
Your date of birth never leaves your browser.
Handles leap years and month lengths precisely.
Days, weeks, hours lived and next birthday.
No signup, no limits, results in one click.
Many applications — financial accounts, medical programmes, benefit schemes, driving tests — require your age on a specific date, not just your year of birth. This calculator gives the exact figure you need.
Enter a future date — a wedding anniversary, retirement date, or graduation — and see exactly how old you or someone else will be at that point. Useful for financial planning and retirement projections.
Enter the founding date of a company, the publication date of a book, or the birthdate of a historical figure, then set the target date to see how old it was at any moment in history.
The total days and hours lived stats are popular for milestone birthdays — 10,000 days, 1,000 weeks, 30 years. Many people use the calculator to find the exact date of a round-number milestone to plan a celebration around.
Enter a pet's birthday or a business's founding date to find its exact age. The next-birthday countdown is also useful for remembering pet vaccination schedules and annual reviews.
The calculator counts the exact number of days between the two dates and then converts that into years, months and days, correctly accounting for each month's actual length and whether any February 29 falls within the period. People born on February 29 will see their age calculated to February 28 in non-leap years.
Yes. Set the Date of Birth to your birthday and the "Age as of" field to any past date — the calculator works for both directions in time.
Yes. The Date of Birth field accepts any date — the founding date of a company, the launch date of a website, a wedding anniversary, or even a historical event. The result tells you how long it has been since that date.
It is the total number of years, months and days converted to an approximate number of hours (multiplied by 24 per day). The figure assumes standard days and does not account for daylight saving time changes, but is accurate to within a few hours over a normal lifespan.
No. The calculator runs entirely in your browser using JavaScript. No date information is transmitted to any server, logged, or stored.
Yes, it is completely free with no signup, no limits and no app to install. Calculate as many ages as you like, right in your browser.
No. The Age Calculator runs entirely in your web browser, so there is nothing to download or install — just open the page and enter a date.
Yes. The tool works in any modern mobile browser, so you can calculate an exact age on your phone or tablet the same way you would on a desktop.