Date & Age Calculator
Calculate age, the number of days between dates, and add or subtract days from a date.
Enter your date of birth to see the result.
Online date calculator — age, days between dates and more
Our free date and age calculator is three tools in one. In the Calculate age tab you enter a date of birth and the calculator instantly computes your full age in years, months and days, the total number of days lived, and the day of the week you were born. In the Days between dates tab you can find out how many days separate any two dates — past or future. The result is also shown in weeks and approximate months.
Adding and subtracting days, weeks, months and years
The third tab — Add / subtract — lets you choose a start date, enter any number and pick a unit: days, weeks, months or years. The calculator computes the result date and shows its day of the week. The tool is handy for calculating payment deadlines, delivery dates, notice periods or planning events. All calculations run in the browser — no data sent to a server, no login required, no pop-up ads.
Frequently asked questions
- How do I calculate my exact age?
- Enter your date of birth in the Calculate age tab — the calculator will show your full age in years, months and days, the total number of days lived, and the day of the week you were born.
- Does the calculator work with future dates?
- Yes. In the Days between dates tab you can enter any two dates — past or future. The calculator will show the difference in days, weeks and approximate months.
- How do I add or subtract days from a date?
- Use the Add / subtract tab. Choose a start date, enter a number, select a unit (days, weeks, months or years) and a direction (add or subtract) — the calculator will show the result date and its day of the week.
- Is my data sent to a server?
- No. All calculations are performed directly in your browser. No date you enter is sent to any server.