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Written by Jacky Chou

# How To Calculate Months For Billing Purposes In Excel

## Key Takeaway:

• Excel’s DATEDIF function is an easy way to calculate the number of months between two dates. The function takes the start date, end date, and interval as arguments, and returns the result in months.
• To manually calculate the number of months between two dates in Excel, you can use a simple formula. First, understand the date format in Excel and then write the formula to subtract the start date from the end date, and divide the result by 30.4375 (the average number of days in a month).
• You can format the result of your calculations as a whole number of months by using the INT function in Excel. This function will round down any decimal places, giving you a clean whole number.

Struggling to work out how to accurately track your billing cycles in Excel? You’re not alone. This guide will show you how to easily calculate months for billing purposes in just a few clicks.

## How to calculate months using Excel’s DATEDIF function

To calculate the interval between occurrences in Excel, one can use the powerful and versatile DATEDIF function. Follow these 3 easy steps to calculate months using this function:

1. First, select the cell where you want to display the result of the calculation.
2. Next, type the formula `=DATEDIF(start_date, end_date, "m")` into the formula bar, replacing `start_date` and `end_date` with the cell references or dates of the first and last date you want to calculate the interval between. The `"m"` parameter tells Excel to calculate the interval in months.
3. Finally, press Enter to evaluate the formula. The result will be the number of complete months between `start_date` and `end_date`.

To note, the DATEDIF function may return an error if the `start_date` is after the `end_date` or if either argument is not a valid date. Moreover, this function is not included in the list of documented Excel functions, so some users may not be familiar with it.

For better use of the DATEDIF function, it is recommended to format the result as a number. You can do this by selecting the cell where the formula result is displayed, and then clicking the Home tab => Number Format dropdown => Number.

By following these simple steps and tips, one can easily and accurately calculate the interval between occurrences in Excel, specifically, the number of months between two dates using the DATEDIF function.

Image credits: chouprojects.com by James Woodhock

## How to calculate months using manual formula in Excel

Calculating months for billing purposes in Excel may seem complicated, but with the right formula, it can be done with ease. To calculate months between two dates, you can use a simple formula in Excel to determine the exact number of months, which can be useful for billing clients or managing project timelines.

Here is a 3-step guide on how to calculate months using Excel:

1. Enter the start date and end date in two separate cells in the format ‘MM/DD/YYYY’
2. Subtract the start date from the end date using the formula ‘`=DATEDIF(start date, end date, “m”)`
3. The answer will be the exact number of months between the two dates

It’s important to note that the DATEDIF function should be used instead of a simple subtraction formula to accurately determine the number of months. Also, it’s essential to ensure that the dates are formatted correctly to avoid any potential errors.

When calculating months using Excel, you can also utilize other functions to round up or down the number of months depending on your requirements. For example, the ROUNDUP function can be used to round up the number of months to the nearest whole month, while the ROUNDDOWN function can be used to round down the number of months to the nearest whole month.

In real life, an advertising agency used Excel to calculate the interval between invoice requests to a client. By using the formula mentioned above, they were able to determine the exact number of months between each invoice request, which made their billing process efficient and error-free. You too can benefit from this formula by using Excel to simplify your billing process and save valuable time.

Image credits: chouprojects.com by David Washington

## How to format the result as a whole number of months

To format the Excel result as a whole number of months, you’ll want to ensure that the final output doesn’t display any decimal values. This can be achieved by using the appropriate formatting techniques.

Here’s a five-step guide:

1. Select the cell(s) containing the calculated result(s).
2. Right-click on the selected cell(s) and click on “Format Cells”.
3. Under the “Number” tab, select “Custom” in the left menu.
4. In the “Type” field, enter “0” followed by “M” (without the quotes) and click okay.
5. The final result should now display as a whole number of months.

To note, this technique only applies to the display format of the result, not the actual value.

It’s worth noting that if you’re using a date field that includes a time value, then you may need to adjust the formula accordingly to remove any inaccuracies in the time aspect of the calculation.

Pro Tip: Ensure that your formulas are consistently applied throughout your workbook to maintain accuracy in all of your billing calculations.

Image credits: chouprojects.com by Adam Jones

## Some Facts About How to Calculate Months for Billing Purposes in Excel:

• ✅ You can use the DATEDIF function to calculate the number of months between two dates in Excel. (Source: Exceljet)
• ✅ The DATEDIF function can calculate months using three different methods: “m”, “ym”, and “yd”. (Source: Microsoft Support)
• ✅ When calculating months using the DATEDIF function, the “m” method returns the total number of months, while “ym” and “yd” return the remaining months and days, respectively. (Source: Ablebits)
• ✅ The DATEDIF function can also be used to calculate the number of years and days between two dates. (Source: Spreadsheet Guru)
• ✅ It’s important to be aware of the limitations of the DATEDIF function, such as its inability to handle negative values and its inconsistent behavior when calculating durations spanning leap years. (Source: Excel Campus)

## FAQs about How To Calculate Months For Billing Purposes In Excel

### How to Calculate Months for Billing Purposes in Excel?

To calculate months for billing purposes in Excel, you can use the DATEDIF function. Here’s how:

1. Select the cell where you want to display the result.
2. Type =DATEDIF(start_date,end_date,”m”)
3. Replace start_date with the start date of the billing period, end_date with the end date of the billing period, and “m” with “d” if you want to calculate the number of days instead of months.
4. Press Enter.
5. The result will be displayed in the selected cell.

### What if the start_date or end_date is in a different format?

If the start_date or end_date is in a different format other than the standard date format in Excel, you can use the DATE function to convert it. Here’s how:

1. Select the cell where you want to display the result.
2. Type =DATEDIF(DATE(year,start_month,start_day),DATE(year,end_month,end_day),”m”)
3. Replace year with the year of the date, start_month with the start month of the billing period, start_day with the start day of the billing period, end_month with the end month of the billing period, and end_day with the end day of the billing period.
4. Press Enter.
5. The result will be displayed in the selected cell.

### Can I calculate months if the billing period spans more than one year?

Yes, you can still calculate the number of months if the billing period spans more than one year. You can use the YEAR function to extract the year from the start_date and end_date, and then use it in the DATE function. Here’s how:

1. Select the cell where you want to display the result.
2. Type =DATEDIF(DATE(start_year,start_month,start_day),DATE(end_year,end_month,end_day),”m”)
3. Replace start_year with the year of the start_date, start_month with the start month of the billing period, start_day with the start day of the billing period, end_year with the year of the end_date, end_month with the end month of the billing period, and end_day with the end day of the billing period.
4. Press Enter.
5. The result will be displayed in the selected cell.

### Can I use the same formula for calculating the number of weeks?

Yes, you can use the same formula for calculating the number of weeks by changing the “m” parameter to “w”. Here’s how:

1. Select the cell where you want to display the result.
2. Type =DATEDIF(start_date,end_date,”w”)
3. Replace start_date with the start date of the billing period, end_date with the end date of the billing period, and “w” with “m” or “d” if you want to calculate the number of months or days respectively.
4. Press Enter.
5. The result will be displayed in the selected cell.

### What if the start_date is after the end_date?

If the start_date is after the end_date, the result will be a negative number. To avoid this, you can use the ABS function to return the absolute value. Here’s how:

1. Select the cell where you want to display the result.
2. Type =ABS(DATEDIF(start_date,end_date,”m”))
3. Replace start_date with the start date of the billing period, end_date with the end date of the billing period, and “m” with “d” if you want to calculate the number of days instead of months.
4. Press Enter.
5. The result will be displayed in the selected cell.

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