Date & Time Tools
Age Calculator
Calculate exact age in years, months, and days.
Free account14-day Pro trialWorks in your browser
Sign in to use this tool
Create a free account to unlock every tool — plus a 14-day free trial of HQ Pro, no card required.
About the Age Calculator
Calculate your exact age free in years, months, and days — from your date of birth to today, or to any past or future date. This age calculator also shows your total age in days, and correctly handles leap years and varying month lengths. Handy for birthdays, eligibility checks, and answering 'how old am I'.
How to use the Age Calculator
- 01Enter the date of birth.
- 02Optionally set the “age at” date (defaults to today).
- 03Read the exact age in years, months, and days.
Frequently asked questions
How is age calculated?
We count complete years, then remaining months and days between the two dates, accounting for varying month lengths and leap years.
Can I calculate age at a future date?
Yes — change the “age at” date to any past or future date.
How old am I in days?
The tool shows your total age in days automatically — a 25-year-old has lived roughly 9,131 days.