Age Calculator
Exact age in years, months and days from a date of birth.
Your figures
Result
How to use this tool
- Enter your own figures over the defaults — Date of birth.
- The answer updates as you type. There is no button, and nothing is sent anywhere.
- Change one input at a time to see how sensitive the answer is to it.
Also shows total days and weeks, which application forms and visa systems sometimes ask for.
How it works
This takes 1 input — date of birth — and returns enter a date. The whole calculation happens in this page as you type: there is no submit button, no request, and nothing stored.
A worked example
Worked through with the figures the page already has in it: date of birth of undefined, giving enter a date of —. These numbers come from running the calculator’s own code, not from being typed in here, so they cannot drift away from what you see on screen.
Starting from:
- Date of birth: undefined
| Result | Value |
|---|---|
| Enter a date | — |
Age Calculator — frequently asked questions
How is age calculated?
Full years elapsed, then remaining months, then remaining days, accounting for varying month lengths.
Does this handle leap years?
Yes. The total-days figure counts actual calendar days including leap days.
Can I calculate age on a future date?
This calculates from today. For a specific date, use the date difference calculator.
Is this calculator free?
Yes, with no account, no limits and no data collection. It runs entirely in your browser.
Should I rely on this for a financial or medical decision?
No. It is a planning estimate built on standard formulas and stated assumptions. For decisions that matter, speak to a qualified professional who can account for your full circumstances.
Is this calculator accurate?
The arithmetic is exact — it uses the standard formula. What limits accuracy is the assumptions: the figures you enter, and factors the formula does not model such as fees, taxes and rule changes.
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Nothing is sent anywhere. The figures you type stay in this page and are never transmitted or stored — how that works.
Disclaimer. The formula is exact; the answer is only as good as the figures and assumptions above. Not financial, tax, medical or legal advice. Full disclaimer.