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Age Calculator

Calculate age in years, days, and weeks from birth date.

Last validated: 2026-02-14

Use this free online Age Calculator to compute exact age from date of birth to a reference date in years, months, and days. It is useful when you need a focused browser-based utility that turns a specific set of inputs into a practical result quickly. The form focuses on Birth date, As of date and returns Age Inputs, Result, so you can move from input to answer without setting up a spreadsheet or custom script. Run one realistic example, adjust the inputs, and compare how the result changes before you copy or share it. Save the inputs with the result when the output will be shared, audited, or used as part of a larger workflow.

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Input Pattern

Enter values in the left panel, keep units explicit, run the calculation, then copy or share the result. Invalid fields are highlighted immediately.

Age Inputs

Result

Age: 31 years

Days lived: 11,459

Weeks lived: 1637.0

How to use this tool

  1. Enter Birth date, As of date for the age calculator, keeping units, dates, or text format consistent with the form labels.
  2. Check optional fields and assumptions before running so the result matches the workflow you have in mind.
  3. Click "Run the tool" and review Age Inputs, Result for the primary output.
  4. Copy or share the result together with the inputs so the output can be reproduced later.

Worked Example

Auto-generated from the tool's current default or entered inputs.

Example Inputs

  • Years: 31
  • Days lived: 11459
  • Weeks lived: 1637.0

Expected Outputs

  • Years: 31
  • Days lived: 11459
  • Weeks lived: 1637

Interpretation

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