Age Calculator
Find your exact age and next birthday countdown. Plus fun life stats you never knew.
Pick your birthdate above to see your results.
How the Age Calculator Works
Enter your birthdate to get your exact age in years, months, and days — accounting for varying month lengths and leap years. It also shows total days and hours lived, and counts down to your next birthday.
Fun Age Facts & Milestones
- The 1 billion second milestone. At exactly 1,000,000,000 seconds old, you are approximately 31 years and 8 months. You can plan a party for it.
- Your heart beats about 2.5 billion times in a lifetime. At a resting rate of 70 bpm, that is roughly 100,000 beats every day — without rest.
- You spend roughly 1/3 of your life asleep. For an average lifespan of 78 years, that is approximately 26 years — about 9,490 days.
- Born on Feb 29? Your "true" birthday only occurs once every four years — but you still age normally every other year.
Frequently Asked Questions
How is exact age calculated?
The calculator subtracts your birth date from today in three steps: years, then months, then days — borrowing from the next higher unit when a value goes negative. This handles months of varying length and produces a precise years/months/days result.
Does it account for leap years?
Yes. Total days and weeks are computed from the millisecond difference between dates, so every Feb 29 is automatically included. If you were born on Feb 29, the next birthday calculation advances to Feb 28 or Mar 1 depending on the year.
What timezone is used?
Your browser's local timezone. Results reflect your local calendar day and may differ by one day if your device is set to a different timezone than where you were born.
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