YEARFRAC in Excel: Calculate Date Differences with Precision
In the realm of Microsoft Excel, understanding and utilizing various functions can significantly enhance your data analysis capabilities. One such powerful function is YEARFRAC, which allows you to calculate the fraction of years between two dates accurately. In this blog post, we will delve into the intricacies of Excel’s YEARFRAC function, equipping you with the knowledge to perform precise date difference calculations effortlessly. Let’s embark on this journey of mastering YEARFRAC and unlocking its potential. Let’s dive in to YEARFRAC excel tutorial
1. YEARFRAC syntax
How to use YEARFRAC in Excel
YEARFRAC(start_date, end_date, [basis])
 start_date: This is the initial date from which you want to calculate the fraction of years.
 for example I’ll put 10201990 (yes my bday)
 end_date: This is the ending date up to which you want to calculate the fraction of years.
 for example: today’s date 10232023
 [basis] (Optional): This argument defines the daycount basis to be used for the calculation. It’s a numerical value that can range from 0 to 4, with different basis options for calculating fractions of years. If you omit this argument, Excel will use the default basis, which is 0.
 Using YEARFRAC function, we can calculate my age (33.0 haha)
2. YEARFRAC excel tips: DayCount Basis Options
The [basis] argument in the YEARFRAC function allows you to choose from several daycount basis options. Each basis option represents a different method for calculating the fractional year. Here are the common basis options:
Let’s consider two dates:
 Start Date: January 1, 2022
 End Date: December 31, 2022
We’ll use these dates for calculations with different daycount basis options.
YEARFRAC excel precision / YEARFRAC excel guide
1. US (NASD) 30/360 (Basis 0):
This is the default basis commonly used for financial calculations. It assumes that each month has 30 days and each year has 360 days. Therefore, the calculation would be: YEARFRAC(start_date, end_date, 0) = YEARFRAC(“10/20/1990”, “10/23/2023”, 0) The result is approximately
 The result is approximately1.00000, indicating one full year.
2. Actual/Actual (Basis 1):
This basis calculates the actual number of days between the start and end dates in each year and divides it by the actual number of days in the year. Here’s the calculation: YEARFRAC(start_date, end_date, 1) = = YEARFRAC(“10/20/1990”, “10/23/2023”, 1)
3. Actual/360 (Basis 2):
In this basis, it calculates the actual number of days between the start and end dates and divides it by 360. The calculation would be:
YEARFRAC(start_date, end_date, 2) = = YEARFRAC(“10/20/1990”, “10/23/2023”, 2)
4. Actual/365 (Basis 3):
Basis 3 calculates the actual number of days between the start and end dates and divides it by 365. Here’s the calculation:
YEARFRAC(start_date, end_date, 3) = YEARFRAC(“01/01/2022”, “12/31/2022”, 3)
5. European 30/360 (Basis 4):
This basis is similar to US (NASD) 30/360 but uses European conventions. It assumes that each month has 30 days and each year has 360 days. The calculation would be:
YEARFRAC(start_date, end_date, 4) = YEARFRAC(“01/01/2022”, “12/31/2022”, 4)
Once again, the result is approximately 1.00000, representing one full year.
These examples demonstrate how different daycount basis options can yield slightly different results when calculating the fraction of years between two dates, depending on the specific conventions used in the calculation. It’s important to choose the basis that aligns with your specific financial or analytical requirements.
3. Fractional Year Result:
The YEARFRAC function returns a decimal value representing the fraction of years between the provided start and end dates. This result can be used for various financial, analytical, or timerelated calculations.
4. Examples:
Let’s illustrate with examples:

 If you have a start date of January 1, 2022, and an end date of December 31, 2022, using the default basis (0), YEARFRAC will return approximately 1.00000, representing one full year.
 If you have a start date of July 15, 2021, and an end date of September 30, 2022, using the Actual/Actual basis (1), YEARFRAC will return a value close to 1.24658, indicating one year and roughly 1.25 months.
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