As you build more complex dashboards and models in Google Sheets, your formulas can become incredibly long, unwieldy, and difficult to understand. If you have a massive, nested formula combining INDEX, MATCH, IFERROR, and REGEXEXTRACT that you need to use in twenty different places across your spreadsheet, copying and pasting it creates a maintenance nightmare. If you need to fix a bug in the formula, you have to find and update all twenty instances.
Google Sheets solves this problem with Named Functions. This feature allows you to encapsulate a complex, custom formula, give it a simple name (like EXTRACT_DOMAIN or CALCULATE_TAX), and reuse it anywhere in your spreadsheet just like a native built-in function.
How to Create a Named Function
Before creating a Named Function, it is best practice to first write and thoroughly test your complex formula in a standard cell to ensure it works correctly.
Step 1: Open the Named Functions Panel
In your Google Sheets document, go to the top menu and click Data > Named functions. This will open a sidebar on the right side of the screen.
Step 2: Add a New Function
Click the Add new function button at the bottom of the sidebar. This opens a configuration panel where you define how your function will work.
Step 3: Configure the Function Details
You must fill out three required sections:
- Function name: Give your function a clear, descriptive name. It must not contain spaces (use underscores instead) and cannot match the name of any existing built-in function. For example:
CALCULATE_DISCOUNT. - Function description: Write a brief sentence explaining what the function does. This description will appear as a helpful tooltip when you or your colleagues type the function into a cell later.
- Formula definition: Paste the actual complex formula here. For example, if you are calculating a 20% tax on a price, you might paste:
=A2 * 1.20.
Defining Argument Placeholders
If you paste =A2 * 1.20 into the formula definition, the function is hardcoded to always look at cell A2. To make the function reusable, you must replace hardcoded cell references with Argument placeholders.
Argument placeholders act as variables. When you use the function later, you will pass actual cell references into these placeholders.
Below the Formula definition box, type a name for your placeholder (e.g., price_cell) and hit Enter to add it to the list of defined placeholders. Now, rewrite your formula definition to use that placeholder instead of the hardcoded cell reference:
=price_cell * 1.20
When you use the function in your sheet as =CALCULATE_DISCOUNT(C5), Google Sheets will automatically substitute C5 in place of price_cell and perform the calculation.
Once your formula and placeholders are defined, click Next. You can optionally add descriptions and examples for each placeholder to make your function even easier to use. Finally, click Create.
Using Your Named Function
Using your custom Named Function is exactly like using SUM() or VLOOKUP(). Click on any cell, type the equals sign, and start typing the name of your new function.
=CALCULATE_DISCOUNT(B2)
Google Sheets will provide autocomplete suggestions and display your custom tooltips and placeholder descriptions, guiding you on how to use it.
Importing Named Functions into Other Sheets
Named Functions are saved specifically to the spreadsheet where they were created. However, you don’t have to recreate them from scratch for every new project.
To use a Named Function in a different Google Sheets document:
- Open the destination spreadsheet.
- Go to Data > Named functions.
- Click the Import function button at the bottom of the sidebar.
- Select the original spreadsheet that contains the functions you want to import.
- Choose which specific functions you want to bring over and click Import.
By leveraging Named Functions, you can abstract away messy, complex logic, making your spreadsheets dramatically easier to read, maintain, and share with colleagues who might not be advanced formula experts.