An age calculator online does one simple job: you enter a date of birth and it tells you exactly how old someone is. The Hawaa Hub free age calculator goes a little further than a single number. It works in your browser, gives the age in years, months and days, and also shows how many weeks, days and hours have passed since birth. This guide explains what it does and how to get the most out of it.
What does an age calculator show?
When you enter a birth date, the tool returns several results at once:
- Exact age in years, months and days.
- Total months, weeks and days lived.
- Approximate hours lived. This is an estimate, because the tool does not know the exact time of birth.
- The weekday of birth, for example Wednesday.
- The next birthday: its date and how many days are left until it.
You do not have to calculate any of this by hand, and you avoid the common mistakes people make when months have different lengths.
How to use this birthday calculator
- Open the age calculator.
- Enter the date of birth.
- Leave the “age at” date as it is to calculate age today, or choose another date to find out how old someone was, or will be, on that day.
- Read the results.
The tool runs in your browser and does not store any date you enter.
A worked example
Take a person born on 14 March 1990 and calculate their age on 10 October 2026.
- Their birthday in 2026 (14 March) has already passed, so they have completed 36 years.
- From 14 March to 14 September is 6 full months.
- From 14 September to 10 October is 26 days (16 days to the end of September, then 10 more).
The exact age is 36 years, 6 months and 26 days. The weekday of birth for 14 March 1990 is Wednesday. The next birthday is 14 March 2027, which is 155 days away from 10 October 2026.
Age calculator for a child
For babies and young children, years alone are not very helpful. Parents, nurseries and clinics usually talk in months. If you are searching for an age calculator of a child, enter the birth date and read the months and days line.
For example, a child born on 20 January 2025 is, on 5 October 2026, 1 year, 8 months and 15 days old. Counted in months only, that is 20 months and 15 days. This kind of result is handy when a form asks for the age in months, or when you want to track how old a baby is without counting on a calendar.
The tool is only a calculator for dates. It does not offer medical advice or comment on development.
Age calculator Google style: quick answers without clutter
Many people type “age calculator google” into a search engine just to get a quick number. A dedicated page like this one gives you the same speed but with extra detail: the months and days, the weekday you were born and the countdown to the next birthday. It is also useful when you need to check an age on a specific date, which a quick search box does not always handle.
Calculating ages on a past or future date
The optional “age at” date turns this into more than a today-only tool. Here are some situations where it helps:
- Eligibility checks. Find out whether someone will be old enough on the date of an event, a course start or a deadline.
- School and nursery forms. Work out a child’s age on a cut-off date.
- Family history. See how old a relative was at a particular moment.
- Planning. Check how old you will be at a future date, such as a planned trip or anniversary.
Always confirm the official rules of the organisation asking, since they may count age differently from this calculator.
Why the exact calculation is trickier than it looks
Subtracting one year from another gives a rough answer, but it goes wrong as soon as the birthday has not happened yet this year. Months also have 28, 29, 30 or 31 days, and leap years add an extra day. A calculator that works through years first, then months, then days handles these cases for you. Ten years of life, for instance, contains either 3,652 or 3,653 days depending on how many leap days fall inside that period.
Need to work backwards from an age?
If someone tells you their age and you need to estimate the year they were born, there are usually two possible answers. Our companion article explains how it works: how to calculate age from a date of birth, a child age in months and a birth year from an age.
Other helpful tools
If you also track time, try the hours calculator for shifts and durations. Writers can use the word counter, and you can see everything else in the free tools collection.
Frequently Asked Questions
Does the age calculator save my date of birth?
No. It runs in your browser and does not store any date.
How accurate is the hours lived figure?
It is approximate. The tool does not know the time of day someone was born, so the hours are an estimate based on the number of days.
Can I find out how old someone was on a specific date?
Yes. Enter the date of birth and set the “age at” date to the day you want to check.
Does it work for babies?
Yes. For young children the result shows months and days, as well as the total months, weeks and days.