Age Calculator
📦 Age Calculator Source Code $4.99
Get the complete, ready‑to‑deploy HTML file with all styling and logic. This is the exact code powering the demo above — no dependencies, works offline, and 100% client‑side. Calculates exact age in years, months, days, hours, minutes, seconds, total days, and weeks. Also shows next birthday and age at next birthday. Perfect for any website or app that needs age verification or birthday countdown. One‑time purchase, lifetime access.
What Is an Age Calculator?
An age calculator computes the exact age of a person based on their date of birth. It’s used in applications ranging from age verification to birthday reminders, and even in scientific research. This tool gives you a detailed breakdown of age in years, months, days, hours, minutes, seconds, total days, and weeks, and also tells you when the next birthday will occur. All calculations are performed using JavaScript's Date object, ensuring accuracy down to the second.
How to Use
- Enter the date of birth using the date picker.
- Optionally enter the time of birth — hour, minute, second — and check "Include time in calculation".
- Click "Calculate Age" — the result appears instantly in the right panel.
- Review your exact age in multiple units, along with the next birthday and age at that birthday.
- Clear the fields with the Clear button to start over.
Frequently Asked Questions
How accurate is the age calculation?
The tool uses JavaScript's built‑in Date object, which accurately handles leap years and time zones. If you include the time of birth, the age is exact down to the second.
Does this tool work offline?
Yes. Once the page loads, all processing happens locally in your browser. No network requests are made.
What if I don't know the time of birth?
You can leave the time fields at 00:00:00 and uncheck "Include time". The calculation will then be based solely on the date, giving you age in years, months, and days.
Disclaimer: This tool performs all operations locally in your browser. No data is stored, transmitted, or logged. Results are provided for informational purposes only.