Total Months
Total Weeks
Total Days
Total Hours
How to Use
- Enter your date of birth in the first field.
- The reference date defaults to today; change it to calculate age at any past or future date.
- Click "Calculate Age" to see your exact age.
- Results show your age in years, months, weeks, days, and hours.
- Your next birthday countdown is also displayed automatically.
Features
Exact Age CalculationGet your age down to hours — not just years.
Custom Reference DateCalculate age at any past or future date.
Next Birthday CountdownSee exactly how many days until your next birthday.
No Signup, No Ads TrackingAll calculations run in your browser. Nothing is stored.
Use Cases
- Find out exactly how old you are in days for a milestone celebration.
- Calculate a child's age for school enrollment requirements.
- Determine age at a historical event by changing the reference date.
- Check if someone meets an age requirement (18+, 21+, 65+, etc.).
- Calculate a pet's age or an anniversary date.
FAQ
How is age calculated?
Age is calculated by finding the difference between the date of birth and the reference date (today by default), accounting for leap years and varying month lengths.
Does this tool store my birthdate?
No. All calculations happen locally in your browser. Your birthdate is never sent to any server.
Can I calculate someone else's age?
Yes. Simply enter any birthdate. The tool works for any person, pet, organization, or object with a known start date.
Why do the total months/days differ from my intuition?
Total months and days are the raw totals (e.g., 300 total months if you are 25 years old). These are different from the remaining months/days shown in the summary.
What is the next birthday countdown?
It shows the number of days remaining until your next birthday from the reference date. If today is your birthday, it shows 0 days.