Age Calculator
Calculate exact age in years, months and days from any date of birth.
That's days · months · weeks
How to use Age Calculator
- Enter your date of birth using the date picker.
- Set the "age at" date if you want age on a specific day — it defaults to today.
- Read your exact age in years, months and days, plus totals in days, weeks and months.
- Change the dates any time to recalculate instantly.
What is Age Calculator?
An age calculator computes the elapsed time between a date of birth and a target date (today by default), expressed as a calendar age — years, months and days. It correctly handles months of different lengths and leap years, which is why it's more accurate than simply subtracting years.
Beyond calendar age, it can express your age in total units lived — days, weeks and months — which is useful for milestones (your 10,000th day, for instance) and statistics.
About the Age Calculator
The Age Calculator works out your exact age from your date of birth — in years, months and days — and also shows how many total days, weeks and months you've lived. Set a different "age at" date to find how old someone was (or will be) on any specific day.
It's handy for forms and eligibility checks, planning birthdays and milestones, working out age gaps, or satisfying curiosity about exactly how long you've been around. The calculation accounts for varying month lengths and leap years, so the result is precise rather than a rough estimate.
Everything runs in your browser and is free with no signup.
Frequently Asked Questions
Learn more
How to Calculate Your Exact Age in Years, Months and Days
Working out your precise age is trickier than it looks once months and leap years get involved. Here is how to do it correctly.
Read the guide