How is the next birthday calculated?

The tool checks whether this year's birthday (same month and day, current year) is still in the future. If it is, that date is used. If it has already passed — or today is the birthday — next year's date is used instead. If today is the birthday, a congratulatory message is shown.

How is the heartbeat estimate calculated?

The estimate uses a resting average of 80 beats per minute. It multiplies your total minutes alive by 80. Individual heart rates vary, so treat this as a fun approximation rather than a medical figure.

Does the countdown keep updating?

Yes. The display refreshes every second using JavaScript's setInterval, so the seconds tick in real time as long as the page is open.

Is my birthdate stored anywhere?

No. The calculation runs entirely in your browser. Your birthdate is never sent to any server.

What if my birthday is February 29?

In a leap year the countdown runs to February 29. In other years it runs to March 1, because February 29 rolls over to March 1 in the calendar. If you celebrate on February 28, take one day off the count.

Why does it show one day less than counting dates on a calendar?

The timer counts down to midnight at the start of your birthday, and the Days number only counts full days. At 3:00 PM on January 1, a February 14 birthday shows 43 days and 9 hours, while counting calendar dates gives 44.

Birthday Countdown

Enter your birthdate to get a live countdown to your next birthday, learn what age you will be turning, see the weekday it falls on, and explore fun lifetime stats including days alive, weeks alive, and estimated heartbeats.

Enter your date of birth and click Start Countdown.

Your Birthdate

Your name (optional)

Date of birth *

Today: Oct 13, 2026

Enter your birthdate and click Start Countdown

Your countdown will appear here

Done!

Quick answer

Enter your date of birth and click Start Countdown. The timer counts down in days, hours, minutes and seconds to 12:00 AM on your next birthday in your own time zone, and shows the age you will turn and the weekday. From midnight on January 1, 2027, a February 14 birthday is 44 days away.

Examples

Birthday	Next one	Days left
Jan 1	Today	Happy Birthday
Jan 2	Sat, Jan 2, 2027	1
Feb 14	Sun, Feb 14, 2027	44
Feb 29	Mon, Mar 1, 2027	59
Jul 4	Sun, Jul 4, 2027	184
Dec 25	Sat, Dec 25, 2027	358

Enter your date of birth and click Start Countdown.

Summary

How it works

Enter your date of birth in the "Birthdate" field.
Optionally enter your name for a personalized message.
Click "Start Countdown." The right panel shows a live countdown in Days, Hours, Minutes, and Seconds.
If today is your birthday, the tool shows a congratulatory message instead of a countdown.
Scroll down the results panel to see fun lifetime stats: days alive, weeks alive, hours alive, minutes alive, and an estimated heartbeat count.

Use cases

Find out exactly how many days, hours, and seconds remain until your next birthday.
Share a fun birthday fact with friends by reading off your lifetime stats.
Use the weekday display to plan birthday events on the right day.
Check how many heartbeats you have had in your lifetime as a conversation starter.

Frequently Asked Questions

Last updated: 2026-05-28 · Reviewed by Nham Vu