The age difference calculator

How far apart
are you, really?

Discover the full story behind any age gap — in days, heartbeats, lunar cycles, and more. Beautiful, fast, and surprisingly insightful.

Start calculating
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The calculator

Enter two dates of birth

Names are optional — but they make the results feel personal. All calculations happen instantly in your browser.

Person A Date of birth
×
Person B Date of birth
? Enter both dates of birth above
to reveal the full picture.
What you get

More than just a number

Timegap goes beyond years and months. Every calculation reveals a rich picture of the time between two lives.

📅
Full breakdown
Years, months, days, weeks, hours — every unit of the gap, calculated precisely to today.
🌙
Fun perspectives
How many heartbeats, lunar cycles, seasons, and sleep nights separate two people.
⭐
Zodiac signs
Instantly see the zodiac sign for each person based on their birth date.
🏁
Shared milestones
When did or will both people hit key ages together — from teenager to centenarian.
🎂
Birthday countdowns
Days until the next birthday for each person, so you never forget again.
🔗
Share results
Copy a shareable summary of the results to send to friends and family.
The process

How it works

01
Enter names & dates
Type in the names (optional) and dates of birth for two people. Results appear instantly as you type.
02
Explore the gap
See the age difference in every unit imaginable — from days to heartbeats — alongside fun facts and milestones.
03
Share & remember
Copy the results to share with whoever you're comparing. All calculations stay in your browser — no data is stored.
Questions

Frequently asked

How is the age difference calculated? +
The difference is calculated from birth date to today's date for each person individually, then compared precisely in years, months, and days — accounting for leap years and varying month lengths.
Is my data stored anywhere? +
No. All calculations happen entirely in your browser using JavaScript. No data is sent to any server or stored anywhere. Your dates and names never leave your device.
How are the fun facts calculated? +
Heartbeats use an average of 100,000 beats per day. Lunar cycles use 29.53 days. Sleep uses one-third of days. Seasons use 91.25 days per season. These are estimates based on widely accepted averages.
Can I use this for any two people? +
Yes — couples, siblings, friends, celebrities, historical figures, or anyone else. As long as you know the birth dates, Timegap can calculate the difference.
What is the maximum age difference it can handle? +
The calculator can handle any two dates in recorded history — there's no practical upper limit. It handles ancient birth years just as well as modern ones.