Simple age
Calendar-aware subtraction
Input
Birth 2000-01-15, Target 2018-05-27
Output
18 years, 4 months, 12 days
Calculators & Converters
Age Calculator
Enter a date of birth and an optional target date (defaults to today) to see age in years, months, and days — not a rough days÷365.25 estimate.
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How the Age Calculator Works
Step 1
Enter your date of birth
Use the date control for an unambiguous calendar date.
Step 2
Choose a target date
Defaults to today; change it for a historical or future age check.
Step 3
Review your age
See years, months, days, and totals.
Age Calculation
- Years, months, and days
- Total months, weeks, and days
- Calendar-aware leap years
- Feb 29 handled as March 1 in non-leap years
- Copy the age result
Inputs and Outputs
Input formats
- Date of birth
- Target date
Output formats
- Years/months/days
- Totals
Supported formats
- Dates
Examples
Frequently Asked Questions
How are leap-day birthdays handled?
If someone was born on February 29, anniversaries in non-leap years are treated as March 1 — a common civil convention.
Is age just total days ÷ 365.25?
No. Age uses calendar-aware years, months, and days.
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