Age Calculator
Find the exact age of a person, relationship, business or item. Enter a start date and get years, months, days, and more — instantly.
What can you calculate?
👤 Person
Exact age in years, months and days. Total days lived, hours and next birthday countdown.
💑 Relationship
How long you have been together. Total days, weeks, months and next anniversary date.
🏢 Business
Days since opening, total months in operation and next business anniversary.
📦 Item
Age of any purchase, device, vehicle or asset since its purchase or creation date.
Frequently Asked Questions
How do I calculate my exact age? +
Select the Person tab, enter your date of birth in the Start Date field. Today's date is already set as the end date. Your exact age appears instantly — in years, months and days, plus total days lived and next birthday countdown.
How do I calculate relationship duration? +
Switch to the Relationship tab and enter your relationship start date. The calculator shows exactly how many years, months and days you have been together, plus your total days and next anniversary date.
Can I calculate the age as of a past or future date? +
Yes. The "As of Date" field defaults to today but you can change it to any date. This lets you calculate age at a specific point in the past or future.
How is the age calculated exactly? +
The calculator counts full calendar years, then remaining full months, then remaining days. This is how most countries legally define age. Total days counts the exact number of days between the two dates.