Age Calculator – Your Exact Age in Years, Months & Days

Find your precise age from your date of birth. See years, months, days lived, next birthday countdown, and leap years. Fully private—no data stored.

Select your date of birth to see your age, next birthday, and more.

Next Birthday Calculator

Use the calculator above to find your exact next birthday date and a live countdown (when "Find age on" is today). You’ll see days, hours, minutes, and seconds until your next birthday. We handle February 29 birthdays correctly — in non‑leap years we use February 28 as the next birthday.

What is an Age Calculator?

An age calculator (or birthday calculator) gives your exact age in years, months, and days from your date of birth. Ours also shows total weeks and months, day of the week you were born, days until your next birthday, leap years lived, and life progress. All calculations run in your browser—no data is sent anywhere.

Use it to calculate your age for forms, milestones, or legal checks. For days between two dates or to add/subtract days, use our Date Calculator; for dog or cat age in human years, use our Pet Age Calculator; for more date and time tools, see Date & Time.

When to Use an Age Calculator

Forms and documents

Many forms need your age in years, months, and days. Our tool ensures you submit the right value.

Milestones and birthdays

Track 10,000 days, 18th or 21st birthdays, and other milestones. The timeline and badges show what you’ve already hit.

Legal age and events

Verify legal age or plan events by calculating age on a specific future date.

How to Use

  1. Enter your date of birth.
  2. Optionally set Find age on (default: today).
  3. Results update automatically. Use Copy age summary or Share result to copy a shareable link.

Explore these related free tools to enhance your productivity and workflow.

Date Calculator

Add or subtract days, weeks, months from any date

Pet Age Calculator

Convert pet years to human years for dogs and cats

Age on Other Planets

Your age on other planets

Work Hours Calculator

Calculate work hours, overtime, and time tracking

Discover more helpful guides and tutorials to enhance your productivity and learn new skills.

How to Calculate Your Exact Age

Guide to age calculations and using age calculators.

Read more →

Date Calculator Guide

Use date calculators for age, days between dates, and more.

Read more →

Complete Guide to Date Calculations

Master date and time calculations.

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How to Use Age Calculator

Follow these simple steps to calculate your exact age in years, months, and days from your date of birth.

1

Enter Your Date of Birth

Select your date of birth using the date picker. You can enter any date from the past. The calculator automatically handles leap years and varying month lengths.

2

Set Target Date (Optional)

By default, the calculator shows your age as of today. You can optionally set a 'Find age on' date to calculate your age at any past or future date. This is useful for planning or historical calculations.

3

View Your Results

The calculator instantly displays your age in years, months, and days, plus total days lived, weeks, hours, minutes, and seconds. You'll also see your next birthday countdown and how many leap years you've lived through.

4

Share or Copy Results

Use the share button to create a shareable URL with your age calculation, or copy the summary text to share on social media. All calculations happen in your browser for complete privacy.

Frequently Asked Questions

How do I calculate my age?

Enter your date of birth in the calculator and optionally set "Find age on" (default is today). You get your age in years, months, and days, plus total days, weeks, hours, and minutes. Use it as a birthday calculator to see your next birthday and countdown.

How many days old am I?

Enter your date of birth and click or leave "Find age on" as today. The age calculator shows your age in years, months, and days, and also total days lived, plus total weeks, hours, and seconds.

What is a birthday calculator?

A birthday calculator (or age calculator) tells you your exact age from your date of birth and shows days until your next birthday. Ours also shows leap years lived, life progress, and works for any target date—past or future.

How accurate is the age calculator?

Our age calculator accounts for leap years and varying month lengths. It handles February 29 birthdays correctly and works for any target date. All calculations run in your browser.

Can I calculate my age at a future date?

Yes. Enter your date of birth and a future date in 'Find age on'. The calculator shows how old you'll be on that date, next birthday, and days until then.

Is the age calculator free?

Yes. It's 100% free, no registration, no tracking. All calculations run in your browser. Your date of birth is never stored or sent anywhere.

Does it work on mobile?

Yes. The age calculator is responsive and works on phones, tablets, and desktops.