You can use Google Apps Script to write a custom function, then use it in Google Sheets just like a built-in function.
The following quickstart sample creates a custom function that calculates the sale price of discounted items. The sale price is formatted as US dollars.
Objectives
- Set up the script.
- Run the script.
Prerequisites
To use this sample, you need the following prerequisites:
- A Google Account (Google Workspace accounts might require administrator approval).
- A web browser with access to the internet.
Set up the script
- Create a new spreadsheet.
- From within your new spreadsheet, select the menu item Extensions > Apps Script.
Delete any code in the script editor and paste in the code below. Then click Save .
/** * Calculates the sale price of a value at a given discount. * The sale price is formatted as US dollars. * * @param {number} input The value to discount. * @param {number} discount The discount to apply, such as .5 or 50%. * @return The sale price formatted as USD. * @customfunction */ function salePrice(input, discount) { let price = input - (input * discount); let dollarUS = Intl.NumberFormat("en-US", { style: "currency", currency: "USD", }); return dollarUS.format(price); }
Run the script
- Switch back to your spreadsheet.
- In a cell, enter
=salePrice(100,.2)
. The first parameter represents the original price and the second parameter represents the discount percentage. If you're in a location that uses decimal commas, you might need to enter=salePrice(100;0,2)
instead.
The formula that you enter in the cell runs the function in the
script you created in the previous section. The function results in a sale
price of $80.00
.
Next steps
To continue learning about how to extend Sheets with Apps Script, take a look at the following resources: