How it is calculated. The tool finds the next date that matches your birth day and month, then counts the calendar days from the "count from" date (today by default). It uses the Gregorian calendar and your device's date, so the live countdown runs to midnight in your own time zone. If you were born on 29 February, you can choose whether your birthday falls on 28 February or 1 March in years that are not leap years.
How to use the birthday calculator
- Pick your date of birth.
- Leave "Count from" as today, or set another date to plan ahead.
- See how many days are left, the weekday of your next birthday and the age you will turn.
- Scroll to the table to see the weekday of your next 10 birthdays, useful for planning a party on a weekend.
Example
Born on 15 August 1995 and counting from 10 November 2026: the next birthday is 15 August 2027, a Sunday, which is 278 days away. You will turn 32. You were born on a Tuesday, and your half birthday is 15 February 2027.
Frequently asked questions
How many days until my birthday?
Enter your date of birth above. The first result shows the exact number of days left, plus a live countdown in hours, minutes and seconds.
What day of the week was I born?
The tool shows it in the "You were born on a" box. It works for any date from 1900 onwards.
I was born on 29 February. When is my birthday?
In leap years it is 29 February. In other years, people celebrate on 28 February or 1 March. Pick the one you use. For an official form, the legal rule can differ from country to country, so check with the office that asks.
What is a half birthday?
It is the date six months after your birthday. Some people mark it for children or when the real birthday falls in a busy season.
Is my date of birth saved?
No. The calculation runs in your browser and nothing is sent or stored.
About this tool. Built and tested by the ToolsRiver team, November 2026. Related tools: Age Calculator (also compares the age difference between two people), How Many Days Have I Been Alive?, Date Calculator and Mulank Calculator.