How to Calculate Your Age in Weeks, Days and Hours

When finding your age in years becomes boring, things can get a little more interesting with discovering your age in different units. With simple arithmetic, you can find your age in weeks, days, and even hours. This is not a knowledge everyone knows about, but this guide will offer you a breakdown of this age calculation method, step-by-step. Learn how to calculate age in weeks, days, and hours, and precisely know how much time has passed since you were born.

Calculate Your Full Age

To find your age in weeks, days, and hours, you must first calculate your full age. You can either do the calculation using our age calculator or proceed with the manual method below:

• Determine Your Date of Birth: While we may all know our date of birth, it is important to cross-check it if you’re not sure. The result of an age calculation is only as correct as the accuracy of data such as this. You can consult your birth certificate, local government registry, or even family members to find your date of birth.

• Find Your Age in Years: Subtract your date of birth from the current date to determine your age in years. If the current date is before the date of birth, remove one year from your result, as you have not yet completed a full birthday year. For example, if a person was born on September 21, 1990, and the current date is May 11, 2025, here’s how to find age:

• • Subtract the birth year from the current year: 2025 − 1990 = 35 years.
  • Check if the birth month and day (September 21) have passed in the current year (2025). In this case, May 11 comes before September 21, so the birthday is yet to occur.
  • Since the birthday has not yet arrived in the current year, subtract 1 from the result: 35 − 1 = 34 years.

• Calculate for Additional Months: If the current month is not your birth month, count the months from your birth month up to the current month to find the additional months in your age.

• • Example: If the birth month is September and the current month is May, the month difference is 8 months.

• Calculate for Additional Days: Simply subtract the day of your birth from the current day of the month to get the additional days in your age. If the current day is before your birthday (meaning you haven’t reached your specific birthday this month yet), you need to calculate the days from your birthday in the previous month up to today. This is usually done by adding the total number of days in the previous month to the current day’s number and then subtracting your birthday number.

• • If the birthday is 21 and the current day is 11, and the last month has 30 days, add 30 to 11 and subtract 21 (birthday digits) from the result.
  • 11 + 30 = 41
  • 41 – 21 = 20 days.

• Determine Full Age: Your full age will consist of your age in years, additional months, and additional days.
• • Using the calculations we have done so far, the full age of a person born on September 21, 1990, when the current date is May 11, 2025, will be 34 years, 8 months, and 20 days.

Calculate Your Age in Weeks 

To discover how many weeks old you are, follow the steps outlined here:

• Multiply Your Age by 52: Given that there are 52 weeks in a single year, let’s see what 52 weeks in your age will be. Hence, we multiply age by 52.
  • Let’s assume your age is 34 years.
  • Number of weeks in = 52 × 34
  • 52 × 34 = 1,768 weeks. 

• Calculate Weeks in Additional Months: Given that there are 4 weeks in the month, we can find the number of weeks in the additional months of your age by multiplying the number of additional months by 4.
  • Let’s assume the number of additional months in your age is 8.
  • Weeks in additional months = 8 × 4.
  • 8 × 4 = 32 weeks. 

• Calculate Weeks in Additional Days: Since days are a smaller time unit than weeks, we will divide the number of additional days in your age by the number of days that make up a week. The Gregorian calendar week is 7 days, so we have:
  • Weeks in additional days = Number of additional days ÷ 7
  • Let’s assume the number of additional days in your age is 20.
  • Weeks in additional month = 20 ÷ 7
  • 20 ÷ 7 = 2.87 weeks.

• Determine Full Age in Weeks: Your full age in weeks is the sum total of the number of weeks in years of age, additional months in age, and additional days in age.
  • Calculating the full weeks in age using our examples so far, we should have 1,758 + 32 + 2.87.
  • 1,758 + 32 + 2.87 = 1,792.87 weeks

Therefore, someone born on September 21, 1990, will be 1,792.87 weeks old by May 11, 2025.

Calculate Your Age in Days

To determine how many days old you are, follow the simple steps below:

• Multiply Your Age by 365.25: Since there are accurately 365.25 days in a year, then the leap year days are already accounted for. Multiply your age by 365.25 to determine the number of days in your years of age.
  • Let’s assume your age is still 34.
  • Number of days in years of age = 365.25 × 34.
  • 365.25 × 34 = 12,418.5 days or 12,418 days, and a half day.

• Calculate Days in Additional Months: Determine the number of months you have aged in since last birth month and consider the number of days in each of them. Then, sum up the number of days in each of them.
  • Let’s assume your birth month is September 1990 and the current month is May 2025.
  • Number of days in months between September 2024 (last birth month) and May 2025: October (31), November (30), December (31), January (31), February (28), March (31), April (30), and May (31). When calculating yours, don’t forget to confirm whether the current year is a leap year and adjust the days of February accordingly.
  • Number of days in months = 31 + 30 + 31 + 31 + 28 + 31 + 30 + 30.
  • 31 + 30 + 31 + 31 + 28 + 31 + 30 + 30 = 242 days.

• Find Additional Days in Age: Simply subtract the day of your birth from the current day of the month to get the additional days in your age. If the current day is before your birthday (meaning you haven’t reached your specific birthday this month yet), you need to calculate the days from your birthday in the previous month up to today. This is usually done by adding the total number of days in the previous month to the current day’s number and then subtracting your birthday number.
  • If the birthday is 21 and the current day is 11, and the last month has 30 days, add 30 to 11 and subtract 21 (birthday digits) from the result.
  • 11 + 30 = 41
  • 41 – 21 = 20 days.

• Determine Full Age in Days: Your full age in days is the sum total of the number of days in years of age, additional months in age, and additional days in age.
• • Calculating the full days in age using our examples so far, we should have 12,418.5 + 242 + 20.
  • 12,418.5 + 242 + 20 = 12,680.5 days

Therefore, someone born on September 21, 1990, will be 12,680 ½ Days old when the current date is May 11, 2025.

Calculate Age in Hours 

To find how many hours have passed since your birth till the current date, convert any unit of your age (years, months, days, etc.) to hours. The smaller the time unit, the more accurate your results will be. Follow any of the methods below to get started:

• Convert Years of Age to Hours: Since there are 8,766 hours in a year (using the much more accurate 365.25 days a year), you can find the number of hours in your years of age by multiplying it by 8,766.
  • Let’s assume that your age in years is 34.
  • Age in hours = 34 × 8,766.
  • 34 × 8,766 = 280,044 hours. (Note that this method is much less accurate as it does not account for additional months and days in age.)

• Convert Days of Age to Hours: To accurately calculate your age in hours, multiply the number of days in your age by 24.
  • From our exercise in the previous section, a person born on September 21, 1990, will have a total of 12,680.5 days in their age by May 11, 2025.
  • To find their age in hours, multiply 12,680.5 by 24.
  • 12,680.5 × 24 = 304,332 hours.

Therefore, someone born on September 21, 1990, will be 304,332 hours old when the current date is May 11, 2025.

Conclusion

Using the simple procedures provided in the article, you can calculate your age in weeks, days, and hours. Once you find your full age (including additional months and days), then the rest of the process becomes a lot easier.