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Age Calculator

Find complete calendar years and months using end-of-month clamping, then count remaining UTC calendar days. Date-only arithmetic, with no time zone or time of birth.

Free to useNo sign-upRuns in your browser
Enter your details

Enter the inputs, then select Calculate age.

Your result
Enter your details

Result will appear here

How Age Calculator works

Find complete calendar years and months using end-of-month clamping, then count remaining UTC calendar days.

Date-only arithmetic, with no time zone or time of birth. A February 29 anniversary clamps to February 28 in a non-leap year.

Concept diagram for Age Calculator, showing birth date input and the supported output.
Concept diagram; the three operation images are actual browser captures.

How to use Age Calculator

Start with your own input.

Enter birth date

Replace the example with the birth date you want to process. Date-only arithmetic, with no time zone or time of birth.

Calculate age
Input and settings
Age Calculator: input and settings in the implemented browser tool
Actual local browser view. Open the image to read it at full size.

Check the settings

Set as of date. These values determine the result.

Calculate age
Tool result
Age Calculator: tool result in the implemented browser tool
Actual local browser view. Open the image to read it at full size.

Run, review and copy

Select Calculate age. Review completed years, months and days plus total days, then use Copy result or Save result.

Calculate age
Review the details
Age Calculator: review the details in the implemented browser tool
Actual local browser view. Open the image to read it at full size.

When to use Age Calculator

Calculate age on a chosen date

To calculate age on a chosen date, start with birth date. Find complete calendar years and months using end-of-month clamping, then count remaining UTC calendar days.

Calculate age
Date and time inputs represented by calendar and clock shapes.
Enter dates and time settings. Concept illustration.

Check a milestone date

To check a milestone date, start with birth date. Date-only arithmetic, with no time zone or time of birth.

Calculate age
Two date or time scenarios represented for comparison.
Compare another date or time. Concept illustration.

Compare two calendar dates

To compare two calendar dates, start with birth date. Copy the result into your working document, or save a local file for later review.

Calculate age
Date or time information used in a planning workflow.
Plan with the result. Concept illustration.

How to read the result

Check what the output means.

Completed years, months and days plus total days. Find complete calendar years and months using end-of-month clamping, then count remaining UTC calendar days.

Date-only arithmetic, with no time zone or time of birth. A February 29 anniversary clamps to February 28 in a non-leap year.

Calculate ageCalculate age
Date or time output connected to its original settings.
Read dates with their settings. Concept illustration.

Supported input and limits

Check the format before processing.

Date-only arithmetic, with no time zone or time of birth. A February 29 anniversary clamps to February 28 in a non-leap year.

Inputs and results are processed locally. Keep your source and save the output you need before leaving.

Calculate ageCalculate age
Calendar boundaries and time settings represented in a review illustration.
Check boundaries and settings. Concept illustration.

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Calculate age with your input

Check the result and copy or save the output.

Calculate age

Age Calculator: common questions

Answers about using Age Calculator and understanding its results.

What does the result represent?

Completed years, months and days plus total days. Date-only arithmetic, with no time zone or time of birth. A February 29 anniversary clamps to February 28 in a non-leap year.

Can I copy or save the output?

Yes. Use Copy result or Save result after processing. Inputs and results are handled in this browser; save what you need before leaving.