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Age Calculator
Calculate exact age in years, months, and days from date of birth with next birthday countdown.
Enter Date of Birth
About This Calculator
The age calculator computes your precise age from your date of birth using exact calendar arithmetic that accounts for leap years and month-length variations. Widely used for official documents, medical forms, retirement planning, and school admissions.
How to Use This Calculator
- 1Enter your date of birth using the date picker
- 2Click Calculate Age
- 3View your exact age in years, months, days
- 4Check your next birthday and countdown
Formula Used
Age = Today's Date − Date of Birth (accounting for leap years and month lengths)
Why Trust CalcPro
Verified mathematical formulas
Trusted by 100K+ monthly users
Works on desktop and mobile
No data stored or shared
Updated regularly
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FAQ
Frequently Asked Questions
Common questions about the age calculator answered.
How is exact age calculated?+
Your age is calculated by subtracting your birth date from today's date. The system first counts full years, then remaining months, then remaining days — accounting for varying month lengths and leap years to give a precise result.
Does this calculator account for leap years?+
Yes. The calculator uses JavaScript's native Date object which fully handles leap years in all computations, including total days lived and the next birthday countdown.
Why might my age differ by one day?+
Small one-day differences can occur due to timezone offsets between your device and your birth country. The calculation uses your device's current local date.
Can I use this for official age verification?+
This calculator is highly accurate and matches standard age computation methods. For legally binding purposes, always refer to official government-issued documents like a birth certificate.
What Is an Age Calculator?
An age calculator determines the exact time elapsed between a birth date and today. It is used for legal documents, medical assessments, insurance, school enrollment, government services, and financial planning. Our tool gives results across multiple units instantly.
- Exact years, months, and days
- Total days and weeks lived
- Next birthday date and days remaining
- Free, no sign-up, works worldwide
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