🎂 Calculator Tools

Age Calculator

Find your exact age in years, months and days — plus a countdown to your next birthday.

Your age

31 years, 1 months, 18 days

🎉 317 days until your next birthday

373
Total months
1,624
Total weeks
11,371
Total days
272,904
Total hours
Overview

Age Calculator: your exact age, down to the day

This age calculator works out exactly how old you are — not just in years, but in years, months, and days — from your date of birth to today or any date you choose. It also shows your age expressed as total months, weeks, days, and hours, and counts down the days to your next birthday. It is handy for forms that need an exact age, for working out eligibility cutoffs, or just for curiosity.

The calculation correctly handles leap years and varying month lengths, so the result matches how age is counted in everyday life. Everything runs locally in your browser — your date of birth is never sent anywhere.

100% freeNo sign-upRuns in your browserNext-birthday countdown
How to use it
  1. 1Pick your date of birth in the first field.
  2. 2Leave the second field on today's date, or set it to any date to find your age at that point.
  3. 3Read your exact age in years, months, and days at the top.
  4. 4Check the totals (months, weeks, days, hours) and the countdown to your next birthday.
Key features
  • Exact age in years, months, and days
  • Age expressed as total months, weeks, days, and hours
  • Countdown to your next birthday
  • Calculate age at any past or future date, not just today
  • Correctly accounts for leap years and month lengths
  • 100% client-side — your date of birth never leaves your device

Frequently asked questions

How is age calculated in years, months, and days?
The tool counts complete years from your birth date, then the remaining complete months, then the leftover days — borrowing from the previous month's length when needed, exactly how age is counted in everyday life.
Does it handle leap years?
Yes. The day totals are based on the actual calendar, so February 29 and leap years are handled correctly.
Can I find my age on a future date?
Yes — set the 'age at date' field to any future date to see how old you will be then, including the countdown.
Is my date of birth stored or uploaded?
No. The calculation runs entirely in your browser and nothing is sent to any server.
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Full guide

Date & Time Calculator — Complete Guide

How date differences, business days, exact age, and countdowns are calculated — including leap years and month lengths.

Age in years, months & daysDate differences & business daysLeap years & month lengths

Related Articles & Guides

BlogYour Age in Days: Milestones, Facts & Why It MattersMost of us measure our lives in years. But switch to days, and suddenly ordinary ages start to feel extraordinary — and occasionally humbling. This post is not ArticleAge Calculator Guide: How to Work Out Your Exact AgeHow exact age in years, months, and days is calculated, why leap years and month lengths matter, and how to use the age calculator.BlogDate & Time Calculations: Complete Developer GuideDates and times are deceptively simple. You look at a calendar, count the boxes between two dates, and call it done. In practice, date and time arithmetic is on