Age Calculator

Calculate your precise age in years, months, days, and seconds

Precise to Seconds Date Formats Real-time
Leave empty for today's date
Enter your birth date to begin

Did You Know?

Age calculation isn't just counting years. It considers leap years (every 4 years) and the varying number of days in each month to give you a precise calculation down to the second.

Historical Dates

You can also use this tool to calculate the time elapsed since historical events or calculate the duration between any two dates by adjusting the "As Of" date.

How Age Calculation Works

Calculating age seems simple, but getting it precise to the day requires handling calendar irregularities.

Month Lengths

Our algorithm automatically adjusts for months with 30 vs 31 days relative to your specific birth month.

Leap Years

Every 4 years (mostly), February has 29 days. We account for every extra day you've lived through.

Time Logic

The tool measures the exact time difference and converts it into standard human-readable units.

Quick Age Facts
  • Average Human Lifespan: ~72 years
  • Days in Average Life: ~26,280 days
  • Hours in Average Life: ~630,720 hours
  • Leap Year Frequency: Every 4 years
Age Milestones
  • Legal Adult (US) 18 years
  • Drinking Age (US) 21 years
  • Senior Citizen 65 years
  • Retirement Age 65-67 years

Frequently Asked Questions

Extremely accurate. It calculates your age down to the exact number of days, considering leap years (29 days in February) and the different number of days in each month (30 vs 31).

Yes! Use the "Calculate Age As Of" field to select any past or future date. This is great for finding out how old you were during historical events or how old you will be in the year 2050.

Our tool uses the standard browser date picker, which automatically adapts to your local date format (e.g., MM/DD/YYYY in US, DD/MM/YYYY in UK). You don't need to worry about formatting.
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