Why use AgeCalc?
- 100% free, no signup. Open the page and use the tool — no account, no email, no paywall.
- Private by design. Everything runs in your browser. Your inputs never leave your device.
- Fast on any device. Lightweight pages that load instantly on mobile and desktop.
Guides & how-tos
Practical guides about age calculators — written to actually help, not to waste your time.
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How to Calculate Age from Date of Birth (Formula Explained)
The exact borrowing method calendars use — with a worked example and leap-year notes.
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How Age Is Calculated for Official Documents
Completed years, DOB proof, and the common mistakes that cause form rejections.
Frequently asked questions
How is age calculated?
We compare your birth date with today, borrowing months and days exactly like a calendar does — the same way official documents compute age.
Does it account for leap years?
Yes. Total days lived is computed from real calendar dates, so leap years are included automatically.
Can I calculate someone else's age?
Of course — enter any past date of birth to find that person's exact age.