Age Calculator
Calculate exact age in years, months, and days from a birth date.
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What is Age Calculator?
An age calculator computes the time elapsed since a birth date — useful for forms, eligibility checks, and personal milestones.
How to use
Select your date of birth.
Optionally set a reference date (defaults to today).
View age and days until next birthday.
Benefits
- Years, months, and days breakdown
- Next birthday countdown
- 100% private in browser
Frequently Asked Questions
How is age calculated?
Age is computed in full years, months, and days between your birth date and a reference date (today by default).
Can I calculate age on a past or future date?
Yes. Change the reference date to check age on a specific day — useful for eligibility forms or historical records.
What does days until next birthday mean?
It counts days from the reference date until your next birthday, including leap-year adjustments.
Is this tool free?
Yes. This tool is completely free to use with no sign-up, no limits, and no hidden fees.
Does my data leave my browser?
No. All processing happens entirely in your browser using client-side JavaScript. Your data is never sent to a server or stored anywhere.
Does this tool work on mobile?
Yes. PeasyDo tools work in modern mobile browsers on iOS and Android. For file tools, use a browser that supports file uploads and downloads.
Do I need to install software?
No. Everything runs in your browser — no desktop app, plugin, or account required.
Feedback & report a problem
Found a bug or have a suggestion? Let us know — it helps us improve this tool.
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