Age Calculator
Calculate your exact age in years, months and days from your date of birth. No signup. Ideal for finding an exact age, ages between dates and precise date differences.
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This age calculator works out your exact age in years, months and days from your date of birth, directly in your browser. Enter your birth date and see your precise age. No account, no install, so you can find an exact age on any device in seconds, accounting correctly for the varying lengths of months and for leap years.
How to Calculate an Age Step by Step
- Enter the date of birth. Type or select the date of birth into the calculator. This is the starting date from which the age will be worked out.
- Set the date to calculate to. By default the age is calculated to today, but you can set another date to find the age as of that date if you wish.
- Calculate the age. The tool works out the exact age between the two dates, accounting for the varying lengths of months and for leap years.
- Read the exact age. See the age expressed in years, months and days, giving a precise figure rather than just a number of whole years.
- Use the result. Use the exact age for whatever you need, from a precise age today to the age someone was or will be on a particular date.
What Makes Age Calculation Tricky
An age calculator works out the exact age from a date of birth, typically expressing it in years, months and days. While the number of whole years is easy enough to know, the exact age, including the months and days, requires careful calculation because of the irregularities of the calendar. This is what an age calculator handles precisely, giving an exact figure rather than an approximation.
Age calculation is trickier than it first appears because months have different lengths and leap years add a day to February. Simply counting years, or trying to work out the months and days by hand, easily goes wrong because of these irregularities. Accounting correctly for the varying month lengths and for leap years is essential to getting the exact age right, which is fiddly to do manually but which a calculator does reliably.
There is a difference between knowing just the years and knowing the exact age. The number of whole years is often all people think of, but the exact age also includes how many months and days beyond that, giving a precise figure. For many purposes the years suffice, but where precision matters, the full years, months and days give the exact age, which the calculator works out correctly.
Age calculators are useful for finding an exact age, and more generally for working out the precise time between two dates in years, months and days. People use them to know an exact age today, the age someone was or will be on a particular date, or simply the precise span between two dates. Because the calendar's irregularities make this fiddly by hand, a calculator gives an accurate result instantly for any dates.
Exact Age Versus Just the Years
| Aspect | Exact age | Just the years |
|---|---|---|
| Includes | Years, months and days | Whole years only |
| Precision | Precise figure | Approximate |
| Handles calendar | Months and leap years | Not needed |
| Best for | When precision matters | A rough age |
Who Uses an Age Calculator
Pro Tips for Age Calculations
Common Age Calculation Mistakes to Avoid
Related Tools You May Need Next
For the plain number of days between dates, our Date Difference Calculator helps, and the Leap Year Checker checks leap years. The Time Duration Calculator finds time between clock times.
Frequently Asked Questions
How do I calculate my age?
Enter your date of birth, and the calculator works out your exact age, by default as of today, though you can set another date if you wish. It accounts for the varying lengths of months and for leap years, giving your precise age in years, months and days, rather than just the number of whole years. This provides an exact figure, correctly handling the calendar irregularities that make working out the exact age fiddly by hand. Just enter the birth date accurately, and your exact age appears instantly.
Why is age calculation tricky?
Because the calendar is irregular: months have different lengths, and leap years add a day to February. Simply counting years, or trying to work out the exact months and days by hand, easily goes wrong because of these irregularities. Getting the exact age right, in years, months and days, requires accounting correctly for the varying month lengths and for leap years, which is fiddly to do manually. This is why an age calculator is useful: it handles these calendar irregularities reliably, giving an accurate exact age that would be easy to get wrong by hand.
What is the difference between exact age and just the years?
The number of whole years is what people often think of as their age, but the exact age also includes how many months and days beyond those whole years, giving a precise figure. For many everyday purposes, the whole years suffice as a rough age. But where precision matters, the exact age in years, months and days gives a complete, accurate figure. The age calculator works out this exact age, correctly handling the calendar, so you get the precise age rather than just the approximate number of whole years.
Can I calculate age as of a specific date?
Yes, while the calculator finds age as of today by default, you can set another date to calculate the age as of that date instead. This lets you work out the age someone was on a past date, or will be on a future date, which is useful for many purposes, such as knowing an age at a particular event or by a certain deadline. Just set the date you want the age calculated to, and the tool works out the exact age as of that date, accounting for the calendar irregularities.
Does the calculator account for leap years?
Yes, the age calculator accounts correctly for leap years, as well as for the varying lengths of months, when working out the exact age. These calendar irregularities are exactly what makes calculating an exact age tricky by hand, since leap years add a day and months differ in length. The calculator handles them reliably, so the age in years, months and days is accurate. This is one of the main reasons to use a calculator rather than working it out manually, where leap years and month lengths are easy to get wrong.
Can I use it to find the time between any two dates?
Yes, beyond calculating age from a birth date, the calculator can find the precise span between any two dates, expressed in years, months and days. This is useful for working out durations, anniversaries, or how long it is between any two dates, not just ages. Because it accounts for the varying month lengths and leap years, it gives an accurate figure for the time between the dates. So it serves both as an age calculator and, more generally, as a tool for finding the exact span between two dates in years, months and days.
What if I only need the number of days between dates?
If you only need the plain number of days between two dates, rather than an age in years, months and days, a date difference calculator is the more direct tool, giving the total count of days. The age calculator expresses the span in years, months and days, which is ideal for ages and for understanding a duration in calendar terms, while a date difference in days is useful for other purposes. So choose the age calculator for an exact age or a years, months and days span, and a date difference tool when you want the total number of days.
Is the age calculator free?
Yes, it is completely free with no account and no usage limit. You can calculate as many exact ages, or spans between dates, as you like, as often as you like, at no cost. It runs entirely in your browser on any device, so there is nothing to download or install, and the exact age in years, months and days appears instantly whenever you enter a date of birth, accounting correctly for months and leap years to give a precise, accurate result.