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Age Calculator

Calculate exact age in years, months and days from date of birth.

Best for: Use it for exact age on a future date, eligibility cut-offs, anniversaries, gestational or pet age, or counting days to a deadline.

Complete guide
Why this result happened View assumptions

Input

How it's calculated & sources
The Age Calculator uses the standard, deterministic formula, so the same inputs always produce the same result. It runs entirely in your browser, so your inputs are never uploaded. Last reviewed June 2026.
Key assumptions
  • Exact calendar arithmetic

Free & no sign-up · runs entirely in your browser. Results are estimates for general information, not professional advice — verify important decisions with a qualified expert. Last reviewed June 2026.

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Complete guide

Quick answers

Short, sourced answers to the questions people (and AI assistants) ask most.

What is Age?
An age calculator finds the exact time between a birth date (or any start date) and today or a chosen date, expressed in years, months, and days — and often total days, weeks, or hours.
Why does Age matter?
The result is your precise age or interval. Because months vary in length and leap years add a day, a simple 'days ÷ 365' shortcut drifts over time — the calendar-aware method does not.
How is Age calculated?
It counts whole years first, then the remaining months, then the leftover days, accounting for leap years and the fact that months have different lengths. This is more accurate than dividing total days by 365.
What is a good age?
A common year has 365 days and a leap year 366; leap years occur in years divisible by 4 except century years not divisible by 400 (so 2000 was a leap year, 1900 was not).
What are common age mistakes?
Approximating age as total days ÷ 365, which ignores leap years and drifts.
When should you use the Age Calculator?
Use it for exact age on a future date, eligibility cut-offs, anniversaries, gestational or pet age, or counting days to a deadline.

What is the Age Calculator?

An age calculator finds the exact time between a birth date (or any start date) and today or a chosen date, expressed in years, months, and days — and often total days, weeks, or hours.

How the Age Calculator works

It counts whole years first, then the remaining months, then the leftover days, accounting for leap years and the fact that months have different lengths. This is more accurate than dividing total days by 365.

What impacts results most

  1. 1.
    Date of birth (High impact)The age is the gap from this date.
  2. 2.
    Target date (Medium impact)The date you measure age at.

Key assumptions

  • Exact calendar arithmetic

What's a typical value?

A common year has 365 days and a leap year 366; leap years occur in years divisible by 4 except century years not divisible by 400 (so 2000 was a leap year, 1900 was not).

Worked example

From 15 June 1990 to 24 June 2026 = 36 years and 9 days.

Common mistakes to avoid

  • Approximating age as total days ÷ 365, which ignores leap years and drifts.
  • Off-by-one errors from counting the start or end date inclusively.
  • Ignoring time zones when an exact day boundary matters.

Keywords: age, birthday, years.

Reviewed by the Free Tools Galaxy editorial team · Updated June 2026 · Calculated privately in your browser.

Frequently asked questions

Is the Age Calculator free to use?+

Yes. Every tool on Free Tools Galaxy is 100% free, runs in your browser and requires no signup.

How accurate is the Age Calculator?+

Age Calculator uses the standard age formula in double-precision arithmetic, so the same inputs always produce the same result and you can verify any figure by hand. It is an educational estimate — real-world outcomes depend on your actual rates, rules and assumptions.

Do you store my inputs?+

No. The Age Calculator runs entirely in your browser. Nothing is uploaded or saved to a server.

Can I use the Age Calculator on mobile?+

Yes — the interface is fully responsive and works on phones, tablets and desktops.

What are common mistakes to avoid?+

The most frequent mistake is mixing units. Double-check your inputs use a single, consistent unit before clicking Calculate.

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Strip duplicate lines from any list.

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Title: I built/used this free age calculator — instant, no signup

Body: Calculate exact age in years, months and days from date of birth. Try it: https://freetoolsgalaxy.com/tools/age-calculator
LinkedIn post
Age Calculator on Free Tools Galaxy — Calculate exact age in years, months and days from date of birth. https://freetoolsgalaxy.com/tools/age-calculator
Medium intro
# Age Calculator — the free tool I keep coming back to

Calculate exact age in years, months and days from date of birth.

Try it: https://freetoolsgalaxy.com/tools/age-calculator
Quora answer
The fastest way is to use a free in-browser age calculator: https://freetoolsgalaxy.com/tools/age-calculator. Calculate exact age in years, months and days from date of birth.

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<iframe src="https://freetoolsgalaxy.com/tools/age-calculator?embed=1" title="Age Calculator" loading="lazy"
  style="width:100%;height:600px;border:0;border-radius:16px;background:#0b1020"
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<p><a href="https://freetoolsgalaxy.com/tools/age-calculator" target="_blank" rel="noopener">Powered by Age Calculator on Free Tools Galaxy</a></p>
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<div style="position:relative;padding-bottom:75%;height:0;overflow:hidden;border-radius:16px">
  <iframe src="https://freetoolsgalaxy.com/tools/age-calculator?embed=1" title="Age Calculator" loading="lazy"
    style="position:absolute;inset:0;width:100%;height:100%;border:0" allow="clipboard-write"></iframe>
</div>
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[Age Calculator — free online tool](https://freetoolsgalaxy.com/tools/age-calculator)

<iframe src="https://freetoolsgalaxy.com/tools/age-calculator?embed=1" width="100%" height="600" frameborder="0"></iframe>
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<a href="https://freetoolsgalaxy.com/tools/age-calculator" target="_blank" rel="noopener">Try the free Age Calculator</a>

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Title
I built a free word counter that works instantly in the browser — no signup, no ads in your face
Body
Hey r/[subreddit],

I kept needing a quick word counter and most options online were slow or behind paywalls, so I built one that:

• Runs 100% in your browser (your data never leaves your device)
• No signup, no email wall, no popups
• Loads in under a second on mobile

It covers the standard word counter use cases (count, words, characters) and links out to the formula + worked examples if you want to learn the math.

Link: https://freetoolsgalaxy.com/tools/word-counter

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