How is age calculated for a February 29 birthday?
In years without a February 29, this calculator counts the birthday on February 28 — the most common legal convention in the US. Some states and countries use March 1 instead for certain purposes, so check the rule if an exact legal age matters.
Age on a specific date
Forms often ask for your age on a set date — a school cutoff, a sports season, an insurance start date or a retirement plan rule. Change the second date to see your exact age that day. For other date maths, such as days between two dates, use the date calculator.
How to calculate age from a date of birth
- 1Subtract the birth year from the current year.
- 2If this year’s birthday hasn’t happened yet, subtract one more year.
- 3Count the whole months since the last birthday.
- 4Count the remaining days since that month mark.
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Frequently asked questions
How do I calculate my age in days?
Count the days from your date of birth to today, including leap days. The calculator shows this as “total days” — for example, someone exactly 30 years old has lived about 10,957 or 10,958 days, depending on leap years.
Why do months have different lengths in my age?
Months are counted from your birthday’s date each month. If you were born on the 31st, months without a 31st count on their last day, so the remaining days are counted from there.
Does the calculator store my date of birth?
No. The calculation runs in your browser. The dates are only kept in the page address so you can share or bookmark the result.
Results are calculated in your browser and rounded for display. How we build and check our calculators.