Age Calculator – Complete Guide & Free Online Tool

An age calculator computes your exact age from your date of birth in years, months, weeks and days. Free online tool included.

Published 2026-09-13

In this guide
  1. What is Age Calculator?
  2. How age is calculated
  3. Key Features
  4. Examples
  5. Common Use Cases
  6. Tips & Best Practices
  7. Limitations
  8. Related Tools
  9. External Resources

What is Age Calculator?

An age calculator computes your exact age from your date of birth in years, months, weeks and days.

How age is calculated

The tool computes the difference between your date of birth and today, adjusting for months and days to give an accurate year count, then derives weeks and days.

Key Features

• Years • months • weeks and days • Accurate day calculation • Local processing

Examples

• Someone born on 2000-06-15 has a precise age that updates with the current date.

Common Use Cases

• Form filling • Milestones • Record-keeping

Tips & Best Practices

• Use YYYY-MM-DD for the most reliable parsing.

Limitations

• Results depend on the device\s current date.

Related Tools

Explore other calculators: [Calculators](/categories/calculators).

Related tools: [date-difference](/tools/date-difference), [bmi-calculator](/tools/bmi-calculator), [time-duration](/tools/time-duration).

External Resources

Wikipedia: Age

Related Tools

Date Difference Calculator Calculate the number of days, weeks, months and years between two dates. Calculators Use Tool →
BMI Calculator Calculate your Body Mass Index from weight and height. Calculators Use Tool →
Time Duration Calculator Calculate the duration between two times of day. Calculators Use Tool →

Frequently Asked Questions

How do you calculate age?
By computing the difference between the date of birth and the current date, adjusting for calendar months and days.
What date format should I use?
YYYY-MM-DD is recommended.
Is it free?
Yes, and it runs locally.

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