Best Free Online Developer Tools to Use in 2026
A practical, opinionated list of the best free online developer tools worth using in 2026, organized by category so you can find what you need fast.
Aug 08, 2026
Age Calculator
Calculate exact age in years, months, days, hours, minutes, and seconds from your birth date.
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Leave empty to use today's date
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Years
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Months
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Days
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Hours
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Minutes
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Seconds
Exact Age Breakdown
What is an Age Calculator?
An age calculator computes the exact age between two dates — typically a birth date and the current date. It calculates the precise duration in years, months, days, hours, minutes, and seconds.
This tool features:
- Precise calculation — Age in years, months, days, hours, minutes, and seconds.
- Custom date — Calculate age as of any specific date, not just today.
- Age breakdown — See total months, weeks, days, hours, minutes, and seconds.
- Instant results — Results update in real-time as you type.
How to Use
- Enter your birth date — Select your date of birth using the date picker.
- Choose "as of" date — Optionally select a different date to calculate age as of that date (defaults to today).
- View your age — Your exact age appears in all time units instantly.
Frequently Asked Questions
How is age calculated?
Age is calculated by finding the difference between two dates. The calculator accounts for leap years and varying month lengths to give the most accurate result.
Can I calculate age for future dates?
Yes. You can set the "as of" date to any date in the past or future to calculate age as of that specific date. This is useful for determining age at a future milestone.
Does it account for leap years?
Yes. The JavaScript Date object handles leap years automatically, ensuring accurate day counts across all years.
Is this tool free to use?
Yes. All processing happens entirely in your browser. No data is sent to any server.
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