Age Calculator
Enter a date of birth to see the exact age in years, months and days, the total time lived in smaller units, and how long it is until the next birthday.
Result
- Age in years
- 36 years
- Total months
- 432 months
- Total weeks
- 1,878 weeks
- Total days
- 13,149 days
- Total hours
- 315,576 hours
- Born on a
- Monday
- Next birthday
- Today
- Next half birthday
- Wednesday, July 15, 2026
- Korean age (traditional counting)
- 37
Formula
- Age = comparison date − date of birth, counted in whole years, then whole months, then days
- Total days = number of calendar days between the two dates
- Traditional Korean age = current year − birth year + 1
How the Age Calculator works
Age is counted in completed years. You turn a year older on the anniversary of your birth, not before. The calculator counts whole years first, then whole months since the last birthday, then the days left.
Someone born on February 29 has a birthday only in leap years. In other years this calculator treats February 28 as the anniversary, which is the common convention.
The traditional Korean system counts a baby as 1 at birth and adds a year every January 1. South Korea adopted the international system for official use in 2023.
Worked example
A person born January 15, 1990 is exactly 36 years old on January 15, 2026. That is 432 months or 13,149 days, which includes nine leap days.
Frequently asked questions
How do I calculate my age in days?
Enter your date of birth and read the total days line. It counts every calendar day, including the extra day in each leap year.
When is my half birthday?
Your half birthday is six calendar months after your birthday. For a January 15 birthday it is July 15.
How is age calculated if I was born on February 29?
In leap years your birthday is February 29. In other years the anniversary is taken as February 28 here, though some jurisdictions use March 1 for legal purposes.
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Calculations run in your browser and nothing you enter is sent to a server. Results are provided for general information. Check critical figures independently before relying on them.