Age Difference Calculator
Find the exact difference between two dates of birth in years, months, days, weeks, and hours.
Free Age Difference Calculator
Curious how many years, months, and days separate two people's ages — siblings, partners, or friends? Our free Age Difference Calculator compares two dates of birth and gives you the exact difference, down to the day.
How to Use This Tool
Step 1: Enter the first date of birth.
Step 2: Enter the second date of birth.
Step 3: Click "Calculate Age Difference" to see the exact gap in years, months, and days, plus totals in weeks, days, and hours.
How Is Age Difference Calculated?
The calculator finds the exact calendar difference between the two dates, correctly accounting for leap years and the varying number of days in each month, then breaks the result down into years, months, and days — along with the equivalent totals in months, weeks, days, and hours.
Common Use Cases
- Finding the exact age gap between siblings.
- Comparing ages between partners or friends.
- Settling a friendly debate about who is older and by how much.
Privacy & Security
All calculations happen locally in your browser. Your dates are never uploaded to a server.
Frequently Asked Questions
Related Tools
Also try our Age Calculator, Date Calculator, and Time Calculator.
Ready to compare two ages? Enter both dates above — free and instant.
Share Your Experience
Found this tool useful? Have a suggestion or found a bug? Send your feedback directly to us — we read every message.