Age Calculator

An age calculator determines how much time has elapsed between two dates — typically your date of birth and today. The result is expressed in years, months, weeks, and days.

To calculate age: subtract the birth year from the current year, then adjust if the birthday has not yet occurred this year. Example: born March 15, 1990 → as of August 15, 2026, age = 36 years, 5 months, 0 days.

Key Features

• Calculates exact age in years, months, weeks, and days.
• Supports any date from historical dates to far-future dates.
• Can calculate age on a specific target date (not just today).
• Accounts for leap years correctly.
• Runs entirely in your browser — no date of birth is sent to any server.

How to Use the Tool

1. Enter your date of birth in the date field.
2. By default, the calculator uses today's date. You can change the 'as of' date to any date you need.
3. The result shows your exact age immediately.

Core Benefits

• More accurate than mental arithmetic — automatically handles different month lengths and leap years.
• Useful for verifying age for legal, medical, or official purposes.
• Helps plan milestone events like 18th or 21st birthdays.

Common Use Cases

• Checking if you meet an age requirement (e.g. 18+ for a service).
• Calculating a child's age for school enrollment eligibility.
• Finding how many days until your next birthday.
• Determining age at retirement or pension eligibility date.
• Historical research — calculating how old a historical figure was on a specific date.

Pro Tips

• To find your age on a future date, change the 'as of' date field to that future date.
• Age calculations differ slightly by jurisdiction — this calculator uses the most common method (birthday not yet passed this year → subtract 1 from year difference).