# Google Sheets ISOWEEKNUM Function: Syntax, Examples & Tips - URL: https://betteranalyst.com/google-sheets/isoweeknum-function - Author: Better Analyst Formula Bot is now Better Analyst—same account, more powerful analysis.Formula Bot is now Better Analyst—same account and workflows, with more powerful analysis, dashboards, and automation. [Learn what changed](https://betteranalyst.com/formula-bot-is-now-better-analyst) The ISOWEEKNUM function returns the ISO week number of a given date, helping to identify the week of the year according to ISO standards. ``` ISOWEEKNUM(date) ``` Generate FormulaExplain Formula One free generation or explanation per browser, shared across Excel and Google Sheets. Account usage limits apply afterward. Describe the ISOWEEKNUM you need in plain EnglishGenerate Formula ## Parameters **`date`**:\ The date for which you want to determine the ISO week number. This can be a date value, a cell reference containing a date, or a formula that returns a date. ## What is ISOWEEKNUM? The *ISOWEEKNUM* function in Google Sheets is a useful tool that returns the ISO week number of a given date. The ISO week date system is a part of the ISO 8601 date and time standard, which defines a week as starting on Monday and ending on Sunday. This function is particularly helpful for businesses and organizations that need to track weekly data, such as sales or project progress, according to the ISO standard. In simpler terms, ISOWEEKNUM allows you to determine which week of the year a specific date falls into, based on the ISO week date system. ## A Practical Example Imagine you are tracking sales data for your business and you have a list of sales transactions with their corresponding dates: ### Sales Data Table: | SaleID | SaleDate | Amount | | - | - | - | | 1 | 2023-01-03 | 150.00 | | 2 | 2023-01-10 | 200.00 | | 3 | 2023-01-17 | 250.00 | You want to find out which ISO week each sale occurred in. ## ISOWEEKNUM Formula To achieve this, you would use the ISOWEEKNUM function as follows: ``` =ISOWEEKNUM(B2) ``` In this formula: - `B2` is the cell containing the SaleDate from the Sales Data Table. ## Result of the Formula When you apply the ISOWEEKNUM formula to the Sales Data Table, the output would look like this: | SaleID | SaleDate | Amount | ISO Week Number | | - | - | - | - | | 1 | 2023-01-03 | 150.00 | 1 | | 2 | 2023-01-10 | 200.00 | 2 | | 3 | 2023-01-17 | 250.00 | 3 | In this case, the ISO week numbers indicate that the first sale occurred in the first week of the year, the second sale in the second week, and the third sale in the third week. ## Why Use ISOWEEKNUM? ISOWEEKNUM is beneficial because it provides a standardized way to track and analyze weekly data. It helps ensure consistency in reporting and can be particularly useful for businesses that operate on a weekly cycle. By using this function, you can easily aggregate data by week, making it simpler to identify trends and patterns over time. ## Key Takeaways: - **ISOWEEKNUM**: A Google Sheets function that returns the ISO week number for a given date. - **Standardized Tracking**: Helps maintain consistency in weekly reporting according to the ISO standard. - **Useful for Analysis**: Ideal for businesses that need to analyze data on a weekly basis, such as sales or project timelines. - **Easy to Use**: Simple formula that can be applied to any date to determine its corresponding ISO week number. ISOWEEKNUM is an essential function for anyone working with date-related data in Google Sheets, providing a straightforward way to enhance data analysis and reporting capabilities. Happy spreadsheeting! ## Example use case You have a table with dates in Column A and sales figures in Column B. By using ISOWEEKNUM, you can calculate the ISO week number for each date, allowing you to analyze weekly sales trends and compare performance across different weeks efficiently. ## Need more help with Google Sheets formulas? Sign up for Better Analyst and get unlimited AI-powered formula generation, explanations, and advanced data analysis. [Create Free Account](https://betteranalyst.com/signup)[Try Formula Generator](https://betteranalyst.com/excel-ai) ## Google Sheets how-to guides - [How To Highlight Duplicates In Google Sheets](https://betteranalyst.com/google-sheets/how-to-highlight-duplicates-in-google-sheets) - [How To Insert Checkbox In Google Sheets](https://betteranalyst.com/google-sheets/how-to-insert-checkbox-in-google-sheets) - [How To Insert Multiple Rows In Google Sheets](https://betteranalyst.com/google-sheets/how-to-insert-multiple-rows-in-google-sheets) - [How To Lock A Row In Google Sheets](https://betteranalyst.com/google-sheets/how-to-lock-a-row-in-google-sheets) - [How To Lock Cells In Google Sheets](https://betteranalyst.com/google-sheets/how-to-lock-cells-in-google-sheets) - [How To Make A Copy Of An Google Sheets Sheet](https://betteranalyst.com/google-sheets/how-to-make-a-copy-of-an-google-sheets-sheet) - [How To Make A Graph In Google Sheets](https://betteranalyst.com/google-sheets/how-to-make-a-graph-in-google-sheets) - [How To Make A Histogram In Google Sheets](https://betteranalyst.com/google-sheets/how-to-make-a-histogram-in-google-sheets) ## Explore all Google Sheets formulas Browse our complete library of Google Sheets formula guides Compare your options ## Decide with evidence, not a sales pitch. 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