Age Calculator
Calculate your exact age in detail.
Your Age
About Age Calculator
This tool calculates the precise time difference between two dates. While commonly used to find your current age, it is versatile enough to calculate the duration of any event, project, or historical period.
Understanding Age Calculation
Calculating age isn't as simple as subtracting years. Our tool accounts for:
- Leap Years: Years with 366 days (occurring every 4 years) are factored into day counts.
- Variable Month Lengths: The tool correctly handles months with 28, 30, or 31 days.
- Time Zones: We calculate based on the dates provided, independent of your current time zone.
Chronological vs. Biological Age
Note that this tool calculates your Chronological Age (the amount of time that has passed from your birth to the given date). Your Biological Age may differ depending on your health, lifestyle, and genetics. Someone with a chronological age of 50 might have the biological health markers of a 40-year-old.
Different Ways to Count Age
Did you know age is reckoned differently across cultures?
- International System: A person is 0 years old at birth and turns 1 on their first birthday. (This tool uses this system).
- Traditional Korean Age: A baby is considered 1 year old at birth and gains a year every New Year's Day, not on their birthday.
Frequently Asked Questions
How do I calculate age in Excel?
You can use the DATEDIF function in Excel. The formula is: =DATEDIF(A1, TODAY(), "Y") (where A1 is the cell with the birthdate). To get years, months, and days, the formula becomes more complex, which is why this online tool is often faster.
How many days old am I?
Enter your birthdate above, and look at the "Total Days" section in the results. For example, a 20-year-old is approximately 7,300 days old.
Can I calculate age for a future date?
Yes! Just change the "Age at Date" field to any date in the future. This is perfect for seeing how old you will be at the turn of the century or on a specific milestone.
What is my age in dog years?
The common rule of thumb is "1 human year = 7 dog years," but it's more nuanced. Small dogs age slower than large breeds. Roughly, the first year of a dog's life equals 15 human years!
Does this calculate leap years correctly?
Yes, our algorithm accounts for every leap year between the two dates to ensure the total day count is 100% accurate.
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