# Excel ATAN2 Function: Syntax, Examples & Tips - URL: https://betteranalyst.com/excel/atan2-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 ATAN2 function calculates the arctangent of the quotient of two numbers, returning the angle in radians. ```excel =ATAN2(x_num, y_num) ``` Generate FormulaExplain Formula One free generation or explanation per browser, shared across Excel and Google Sheets. Account usage limits apply afterward. Describe the ATAN2 you need in plain EnglishGenerate Formula Need more than a single ATAN2 formula? Try our free [AI for Excel](https://betteranalyst.com/excel-ai) — it reads your entire spreadsheet, answers questions in plain English, and builds charts and analysis in the same chat. ## Parameters **`x_num`**:\ The x-coordinate (horizontal) value for which you want to calculate the arctangent. **`y_num`**:\ The y-coordinate (vertical) value for which you want to calculate the arctangent. ## What is an ATAN2 Formula in Excel? The *ATAN2* function in Excel is a mathematical tool that calculates the arctangent, or inverse tangent, of the quotient of two specified numbers. It returns the angle in radians between the positive x-axis and the point given by the coordinates (x, y). This function is particularly useful in determining the angle of a point in a Cartesian coordinate system. In simpler terms, the ATAN2 function helps you find the angle formed by a line connecting the origin (0,0) to a point (x,y), making it easier to work with angles and trigonometric calculations. ## A Practical Example Imagine you are working on a project that involves plotting points on a graph, and you have the following data in an Excel spreadsheet: ### Coordinate Data Table: | Point | X Coordinate | Y Coordinate | | - | - | - | | A | 3 | 4 | | B | -3 | 4 | | C | -3 | -4 | | D | 3 | -4 | You want to find the angle for each point relative to the origin. ## ATAN2 Formula To calculate the angle for point A, you would use the ATAN2 formula as follows: ```excel =ATAN2(B2, C2) ``` ### Breakdown of the Formula: - **B2**: This is the y-coordinate of the point. - **C2**: This is the x-coordinate of the point. ## Result of the Formula When you apply the formula for point A, it calculates the angle in radians. The output would be: | Angle for Point A (in radians) | | - | | 0.9273 | Here, the angle for point A is calculated as approximately 0.9273 radians. ## Why Use ATAN2? The ATAN2 function is particularly useful when you need to determine angles in a coordinate system without manually calculating the arctangent. It allows you to quickly find angles based on x and y coordinates, making it easier to analyze geometric data. ## Key Takeaways: - **ATAN2**: Calculates the arctangent of the quotient of two numbers, returning the angle in radians. - **Efficient Angle Calculation**: Helps you quickly determine angles without complex calculations. - **Common Use Cases**: Ideal for geometric analysis, navigation, and any scenario where you need to work with angles in a Cartesian plane. Understanding how to use the ATAN2 function can significantly enhance your mathematical and analytical capabilities in Excel, enabling you to work effectively with angles and coordinates. Happy calculating! ## Example use case You have a table where Column A contains the x-coordinates of various points and Column B contains the y-coordinates of those points. You can use the ATAN2 function to calculate the angle (in radians) of each point relative to the origin (0,0). This allows for efficient analysis of the direction of each point in relation to the origin, which can be useful in fields such as physics, engineering, or navigation, without the need for more complex trigonometric calculations. **Beyond the ATAN2 function:** Better Analyst is a full [Excel AI](https://betteranalyst.com/excel-ai) that goes well past individual formulas. Upload any spreadsheet and ask questions in plain English — you'll get formulas, data analysis, and charts back in seconds. It's a free [AI Excel assistant](https://betteranalyst.com/excel-ai) that works with any .xlsx, .xls, or .csv file — no plugins, no Microsoft 365 required. Don't have a spreadsheet yet? 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[Create Free Account](https://betteranalyst.com/signup)[Try Formula Generator](https://betteranalyst.com/excel-ai) ## Excel how-to guides - [How To Wrap Text In Excel](https://betteranalyst.com/excel/how-to-wrap-text-in-excel) - [Excel Conditional Formatting](https://betteranalyst.com/excel/excel-conditional-formatting) - [How To Add A Column In Excel](https://betteranalyst.com/excel/how-to-add-a-column-in-excel) - [How To Alphabetize In Excel](https://betteranalyst.com/excel/how-to-alphabetize-in-excel) - [How To Autofit In Excel](https://betteranalyst.com/excel/how-to-autofit-in-excel) - [How To Calculate Percentage In Excel](https://betteranalyst.com/excel/how-to-calculate-percentage-in-excel) - [How To Combine Two Columns In Excel](https://betteranalyst.com/excel/how-to-combine-two-columns-in-excel) - [How To Copy Formula In Excel](https://betteranalyst.com/excel/how-to-copy-formula-in-excel) ## Explore all Excel formulas Browse our complete library of Excel formula guides Compare your options ## Decide with evidence, not a sales pitch. 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