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Age Calculator

Calculators Free Updated 1 Sep 2026
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ⓘ About this tool 🔄 Last updated 1 Sep 2026 ✓ Reviewed by TopToolAI Team

Age Calculator: find your exact age from your date of birth in years, months and days, and see the same age in months, weeks, days, hours, minutes and seconds, all in one result. Wondering how old you are, how many months old you are, how many days old you are or what your age in seconds is? Enter your date of birth and the calculator answers every one of them at once, together with the weekday you were born and the days left until your next birthday. Pick a date in the optional Age on this date box to calculate your age on any past or future date. For example, someone born on 15 March 1995, checked against 17 September 2026, is 31 years, 6 months and 2 days old, which is 378 months, about 1,644 weeks or 11,509 days. It is useful for forms, school admissions, job applications, passports, insurance and birthdays. The calculation follows the real calendar, so leap years and different month lengths are handled automatically instead of simply dividing the days by 365.

How to use Age Calculator

Step-by-step guide to the boxes below. Open it only if you need help.

  1. 1
    Your birth date Date

    Tap the box and pick the day you were born. If the calendar opens on this year, choose the year first and then the month, it saves a lot of scrolling.

  2. 2
    Age on this date Date optional

    You can skip this box. Leave it empty and the tool counts up to today. Pick another date, for example the day you plan to apply for something, to see your age on that day.

  3. 3
    Press “Calculate Age”

    Click the button under the boxes. If something is missing or not valid, a short message tells you which box to fix.

  4. 4
    Read your result

    You get your age in years, months and days first, then the same age as total months, weeks, days, hours, minutes and seconds, the weekday you were born and the countdown to your next birthday. Change any box and try again to compare different numbers.

Age Calculator FAQs

How do I calculate my age from my date of birth?
Pick your date of birth and press Calculate Age. The tool counts the full years since your birth date, then the full months since your last birthday, then the leftover days, using the real calendar.
How old am I in years, months and days?
Your age in years, months and days is the first line of the result, for example 31 years, 6 months and 2 days. Leave the second box empty to get your age today.
How do I find my age in months?
Multiply your full years by 12 and add the extra months. For example, 5 years and 3 months is 5 x 12 + 3 = 63 months. The Age in months line in the result does this for you and also shows the leftover days.
How do I find my age in weeks?
Divide your age in days by 7. The Age in weeks line shows full weeks plus the leftover days, which is how a baby's age is often described in the first months.
How many days old am I?
The Age in days line shows the exact number of days from your birth date up to today, with leap years counted.
How do I calculate my age in hours, minutes and seconds?
Multiply your age in days by 24 for hours, by 1,440 for minutes and by 86,400 for seconds. The result shows all three. They are estimates, because your exact time of birth is not entered, so the count starts from midnight at the start of your birth date.
Can I calculate my age on a specific date, past or future?
Yes. Use the optional Age on this date box. Leave it empty for your age today, or pick any other date to see how old you were, or will be, on that day, for example on the day of an admission or a form deadline.
Does it account for leap years?
Yes. The calculation is based on actual calendar dates, so leap years and different month lengths are handled automatically.
Can I use this for a legal or official age requirement?
It is fine for general reference, but for anything official (visas, eligibility cutoffs), confirm the exact rule with the relevant authority since some use different counting conventions.

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