What is the Age Calculator?
The age calculator is a free online tool that helps you work out age quickly and accurately. It uses the standard formula Difference between the two dates expressed in years, months and days and shows the result instantly as you type, along with a full breakdown so you can see exactly how the answer was reached.
How to use this calculator
- Enter your date of birth.
- Optionally set the 'as of' date.
- See your exact age.
Formula used
Difference between the two dates expressed in years, months and daysExplanation of each input
- Date of birth โ the date of birth used in the calculation.
- Age at date (defaults today) โ the age at date (defaults today) used in the calculation.
Understanding your result
- Years โ the calculated years.
- Months โ the calculated months.
- Days โ the calculated days.
- Total days โ the calculated total days.
Step-by-step calculation
For the example values DOB 1 Jan 2000:
- Apply the formula:
Difference between the two dates expressed in years, months and days - Substitute the values: diff to today
- Result: e.g. 26 years
Worked example
| Inputs | DOB 1 Jan 2000 |
|---|---|
| Working | diff to today |
| Result | e.g. 26 years |
Benefits and practical uses
This calculator saves you time and reduces errors when you need age. It is useful for students, professionals and anyone who wants a fast, reliable answer without manual calculation. Results update instantly, work in your browser and can be copied or shared in one click.
Assumptions and limitations
- Gregorian calendar.
Frequently asked questions
How is age calculated?
By counting complete years, then months, then days between the two dates.
Disclaimer: Results are provided for general information. Please verify important figures independently.