Age calculator Runs in your browser

Age Calculator & Birthday Insights (Free Online Tool)

Use this free age calculator to get your exact age in years, months, days, weeks and more. See your next birthday, zodiac signs, birthstone, milestone birthdays, and fun context about your birth date and birth year.

All calculations run locally in your browser – your dates are not uploaded or stored.

Enter your dates

Leave blank to use today.

We don’t send your dates anywhere. Everything is calculated locally in your browser.

Age breakdown

Exact age
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Total days lived
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Weeks & days
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Hours / minutes / seconds
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Next birthday

Date
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Day of week
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Days until
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Age turning
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Zodiac & birth details

Western zodiac
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Chinese zodiac (approx.)
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Day of week you were born
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Birth month stone
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Upcoming milestone birthdays

See key milestone ages like 18, 21, 30, 40, 50, and 65 with their exact dates, days of the week, and how many days remain based on your birth date and the calculation date.

Age Date Day of week Days until
Enter your date of birth and calculate to see milestone birthdays.

Fun context for your birthday

Celebrities who share your birthday

Enter your date of birth to see links to famous birthdays on that day.

Things that happened the year you were born

We’ll link you to major events and cultural moments from your birth year.

What this age calculator can do

This PlainBench age calculator is built for quick, no-nonsense answers. Enter your date of birth, optionally choose a calculation date, and you’ll instantly see your exact age, how many days old you are, your age in weeks, and a live countdown to your next birthday.

You’ll also get your Western zodiac sign, an approximate Chinese zodiac sign, the day of the week you were born, and your traditional birthstone based on your birth month. Milestone ages like 18, 21, 30, 40, 50 and 65 are laid out with exact dates so you can plan ahead.

If you need other simple tools, you can also try the online word counter, the image compressor, or the PDF page rearranger.

  • Runs fully in your browser – no account needed.
  • Works on desktop, tablet, and mobile phones.
  • Perfect for quick “how old am I?” checks and planning birthdays.