What is the Age Calculator?
Calculate exact age in years, months and days, plus total days and next birthday. Dates are deceptively tricky — months have different lengths and leap years shift everything. These date and time calculators handle calendar math exactly, using UTC to avoid daylight-saving surprises.
How to use the Age Calculator
- Enter your date of birth, your age on date.
- Results update automatically as you type; you can also press Calculate.
- Read the output: age, total days, total weeks, next birthday.
- Use the 📊 chart to see the result visually, then copy or share it.
Formula and method
Worked example
With date of birth = 1990-05-15, age on date = 2026-10-14, the Age Calculator returns age: 36 years, 4 months, 29 days; total days: 13,301; total weeks: 1,900.
Tips for better results
- Decide whether you need to include the end date when counting days.
- Business-day counts exclude weekends but not public holidays unless you subtract them.
- Timestamps are shown in UTC; convert to your local time zone as needed.
Frequently asked questions
What does the Age Calculator do?
Calculate exact age in years, months and days, plus total days and next birthday.
How is it calculated?
The Age Calculator uses this method: Calendar difference between the two dates, borrowing months and days as needed.
Can you show an example?
With date of birth = 1990-05-15, age on date = 2026-10-14, the Age Calculator returns age: 36 years, 4 months, 29 days; total days: 13,301; total weeks: 1,900.
Is the Age Calculator accurate?
Yes. It uses standard formulas and exact constants, and the results are verified by our automated test suite. Values are displayed to up to 12 significant digits.
Is this tool free and private?
Yes — the Age Calculator is completely free with no sign-up, and it runs entirely in your browser, so the values you enter are never uploaded to our servers.
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