Utility tool
Age Calculator
Enter a birth date to get an exact age in years, months and days, days alive, and a countdown to the next birthday.
Free｜No sign-up｜Files stay on your device
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Support us／Ko-fiAbout Age Calculator
Forms, insurance and retirement plans often need your exact age down to the month and day.
You can also pick any date to see someone's age on that day — for example to check school-entry age cut-offs.
Great for
- ・Insurance and retirement planning
- ・School entry age checks
- ・Anniversaries and days-alive milestones
How to use
- 01Fill in each field.
- 02Results are calculated instantly below.
Why use it
Private by design
Everything runs locally in your browser. Nothing passes through a server.
Instant
No software to download and no account to create.
Works everywhere
Desktop, phone, or tablet — any modern browser.
Free forever
No watermarks and no usage limits.
Frequently asked questions
How is age calculated?
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Your age goes up by one on each birthday. The calculator counts full years, then remaining months and days, and correctly handles leap years and month lengths.
Is this tool free? Do I need an account?
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It's completely free. There's no sign-up, no login and no usage limit.
Are my files and data safe?
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Everything is processed inside your browser. Your files are never uploaded to our servers and disappear when you close the page.
Does it work on my phone?
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Yes. The page is fully responsive and works in current versions of Chrome, Safari and Edge on iPhone, Android and tablets.
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age calculator/how old am i/calculate age from date of birth/days since birth