Age Calculator
Calculates exact age in years, months and days.
Result
- Exact age
- 36 years, 1 months, 26 days
- Total days
- 13,206 days
- Total months
- 433 months
How to use the age calculator
- Enter the date of birth.
- Enter the age on this date.
- The results update as you type, or press Calculate.
- Read the exact age first, then the supporting figures below it.
Formula
Count whole years, then months, then days.
Worked example
For example, with these inputs:
- Date of birth: 9 Aug 1990
- Age on this date: 5 Oct 2026
the calculator returns:
- Exact age: 36 years, 1 months, 26 days
- Total days: 13,206 days
- Total months: 433 months
Background
When sharing dates internationally, write the month as a word to avoid confusion between day-month and month-day formats.
The Gregorian calendar has months of 28 to 31 days and adds a leap day almost every four years, which makes counting days by hand surprisingly error-prone. Converting dates to day numbers and subtracting avoids the problem.
Frequently asked questions
How does the age calculator work?
It applies this formula: Count whole years, then months, then days.
Does this count Singapore public holidays?
No. It counts calendar days or weekdays. Subtract any public holidays in the period yourself.