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Coding level: Beginner Duration: 10 minutes Project type: Custom function
Objectives
Understand what the solution does.
Understand what the Apps Script services do within the
solution.
Set up the script.
Run the script.
About this solution
If you offer a tiered pricing system for your customers, this custom function
makes it easier to calculate the discount amounts for your prices.
Though you could use the built-in function SUMPRODUCT to make a tiered pricing
calculation, using SUMPRODUCT is more complex and less flexible than this
solution's custom function.
How it works
A tiered pricing model means that the cost of goods or services goes down
based on the quantity purchased.
For example, imagine you have two tiers, one that ranges from $0-$500 and is
discounted by 10% and one that ranges from $501-$1,000 and is discounted by 20%.
If the total price you need to calculate a discount for is $700, the script
multiplies
the first $500 by 10% and the remaining $200 by 20%, for a total discount of
$90.
For a given total price, the script loops through the specified tiers in the
tier pricing table. For each portion of the total price that falls
within a tier, that portion is multiplied by the tier's associated percent
value. The result is the sum of each tier's calculation.
Apps Script services
This solution uses the following service:
Spreadsheet service–Takes the given
value and calculates what portion of the value to multiply by each tier's
percent discount.
Prerequisites
To use this sample, you need the following prerequisites:
A Google Account (Google Workspace accounts might
require administrator approval).
A web browser with access to the internet.
Set up the script
Click the button below to make a copy of the Tier pricing custom function
spreadsheet. The Apps Script project for
this solution is attached to the spreadsheet.
Make a copy
Run the script
In your copied spreadsheet, the table at row 16 shows a sample price
calculation for a Software as a Service (SaaS) product.
To calculate the discount amount, in cell C20, enter
=tierPrice(C19,$B$3:$D$6). The final price updates in cell C21. If you're
in a location that uses decimal commas, you might need to enter
=tierPrice(C19;$B$3:$D$6) instead.
Review the code
To review the Apps Script code for this solution, click View source code
below:
You can edit the custom function as much as you'd like to fit your needs. Below
is an optional addition to manually refresh custom function results.
Refresh cached results
Unlike built-in functions, Google caches custom functions to optimize
performance. Therefore, if you change something within your custom
function, such as a value that's being calculated, it might not immediately
force an update. To refresh the function result manually, take the following
steps:
Add a checkbox to an empty cell by clicking Insert>Checkbox.
Add the cell that has the checkbox as an extra parameter of the custom
function. For example, if you add a checkbox to cell D20, update
the tierPrice() function in cell C20 to
=tierPrice(C19,$B$3:$D$6,D20).
Check or uncheck the checkbox to refresh the custom function results.
Contributors
This sample is maintained by Google with the help of Google Developer Experts.
[[["Easy to understand","easyToUnderstand","thumb-up"],["Solved my problem","solvedMyProblem","thumb-up"],["Other","otherUp","thumb-up"]],[["Missing the information I need","missingTheInformationINeed","thumb-down"],["Too complicated / too many steps","tooComplicatedTooManySteps","thumb-down"],["Out of date","outOfDate","thumb-down"],["Samples / code issue","samplesCodeIssue","thumb-down"],["Other","otherDown","thumb-down"]],["Last updated 2025-08-28 UTC."],[[["\u003cp\u003eThis Google Apps Script custom function simplifies tiered pricing calculations in Google Sheets, offering a more straightforward approach than using \u003ccode\u003eSUMPRODUCT\u003c/code\u003e.\u003c/p\u003e\n"],["\u003cp\u003eThe function calculates discounts by iterating through pricing tiers, applying the corresponding percentage discount to the portion of the total price falling within each tier.\u003c/p\u003e\n"],["\u003cp\u003eTo use the function, you need to provide the total price and a table specifying the pricing tiers, start and end values, and discount percentages.\u003c/p\u003e\n"],["\u003cp\u003eThe script utilizes the Spreadsheet service to access and process data within the sheet.\u003c/p\u003e\n"],["\u003cp\u003eYou can manually refresh the custom function's results by adding a checkbox and including its cell reference as an additional parameter in the function call.\u003c/p\u003e\n"]]],[],null,["# Calculate a tiered pricing discount\n\n**Coding level** : Beginner \n\n**Duration** : 10 minutes \n\n**Project type** : [Custom function](/apps-script/guides/sheets/functions)\n\nObjectives\n----------\n\n- Understand what the solution does.\n- Understand what the Apps Script services do within the solution.\n- Set up the script.\n- Run the script.\n\nAbout this solution\n-------------------\n\nIf you offer a tiered pricing system for your customers, this custom function\nmakes it easier to calculate the discount amounts for your prices.\n\nThough you could use the built-in function `SUMPRODUCT` to make a tiered pricing\ncalculation, using `SUMPRODUCT` is more complex and less flexible than this\nsolution's custom function.\n\n### How it works\n\nA tiered pricing model means that the cost of goods or services goes down\nbased on the quantity purchased.\n\nFor example, imagine you have two tiers, one that ranges from $0-$500 and is\ndiscounted by 10% and one that ranges from $501-$1,000 and is discounted by 20%.\nIf the total price you need to calculate a discount for is $700, the script\nmultiplies\nthe first $500 by 10% and the remaining $200 by 20%, for a total discount of\n$90.\n\nFor a given total price, the script loops through the specified tiers in the\ntier pricing table. For each portion of the total price that falls\nwithin a tier, that portion is multiplied by the tier's associated percent\nvalue. The result is the sum of each tier's calculation.\n\n### Apps Script services\n\nThis solution uses the following service:\n\n- [Spreadsheet service](/apps-script/reference/spreadsheet)--Takes the given value and calculates what portion of the value to multiply by each tier's percent discount.\n\nPrerequisites\n-------------\n\nTo use this sample, you need the following prerequisites:\n\n- A Google Account (Google Workspace accounts might require administrator approval).\n- A web browser with access to the internet.\n\nSet up the script\n-----------------\n\nClick the button below to make a copy of the **Tier pricing custom function**\nspreadsheet. The Apps Script project for\nthis solution is attached to the spreadsheet.\n\n[Make a copy](https://docs.google.com/spreadsheets/d/13X-3pz8P_sfAyNqUJrGe0HdgzKARIMxC6Y6xZDAF7M0/copy)\n\nRun the script\n--------------\n\n1. In your copied spreadsheet, the table at row 16 shows a sample price calculation for a Software as a Service (SaaS) product.\n2. To calculate the discount amount, in cell `C20`, enter `=tierPrice(C19,$B$3:$D$6)`. The final price updates in cell `C21`. If you're in a location that uses decimal commas, you might need to enter `=tierPrice(C19;$B$3:$D$6)` instead.\n\nReview the code\n---------------\n\nTo review the Apps Script code for this solution, click **View source code**\nbelow: \n\n#### View source code\n\n### Code.gs\n\n\u003cbr /\u003e\n\nsolutions/custom-functions/tier-pricing/Code.js \n[View on GitHub](https://github.com/googleworkspace/apps-script-samples/blob/main/solutions/custom-functions/tier-pricing/Code.js) \n\n```javascript\n// To learn how to use this script, refer to the documentation:\n// https://developers.google.com/apps-script/samples/custom-functions/tier-pricing\n\n/*\nCopyright 2022 Google LLC\n\nLicensed under the Apache License, Version 2.0 (the \"License\");\nyou may not use this file except in compliance with the License.\nYou may obtain a copy of the License at\n\n https://www.apache.org/licenses/LICENSE-2.0\n\nUnless required by applicable law or agreed to in writing, software\ndistributed under the License is distributed on an \"AS IS\" BASIS,\nWITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.\nSee the License for the specific language governing permissions and\nlimitations under the License.\n*/\n\n/**\n * Calculates the tiered pricing discount. \n * \n * You must provide a value to calculate its discount. The value can be a string or a reference\n * to a cell that contains a string.\n * You must provide a data table range, for example, $B$4:$D$7, that includes the \n * tier start, end, and percent columns. If your table has headers, don't include\n * the headers in the range.\n * \n * @param {string} value The value to calculate the discount for, which can be a string or a \n * reference to a cell that contains a string.\n * @param {string} table The tier table data range using A1 notation.\n * @return number The total discount amount for the value.\n * @customfunction\n * \n */\nfunction tierPrice(value, table) {\n let total = 0;\n // Creates an array for each row of the table and loops through each array.\n for (let [start, end, percent] of table) {\n // Checks if the value is less than the starting value of the tier. If it is less, the loop stops.\n if (value \u003c start) {\n break;\n }\n // Calculates the portion of the value to be multiplied by the tier's percent value.\n let amount = Math.min(value, end) - start;\n // Multiplies the amount by the tier's percent value and adds the product to the total.\n total += amount * percent;\n }\n return total;\n}\n```\n\n\u003cbr /\u003e\n\n\u003cbr /\u003e\n\nModifications\n-------------\n\nYou can edit the custom function as much as you'd like to fit your needs. Below\nis an optional addition to manually refresh custom function results. \n\n#### Refresh cached results\n\n\nUnlike built-in functions, Google caches custom functions to optimize\nperformance. Therefore, if you change something within your custom\nfunction, such as a value that's being calculated, it might not immediately\nforce an update. To refresh the function result manually, take the following\nsteps:\n\n1. Add a checkbox to an empty cell by clicking **Insert** \\\u003e **Checkbox**.\n2. Add the cell that has the checkbox as an extra parameter of the custom function. For example, if you add a checkbox to cell `D20`, update the `tierPrice()` function in cell `C20` to `=tierPrice(C19,$B$3:$D$6,D20)`.\n3. Check or uncheck the checkbox to refresh the custom function results.\n\nContributors\n------------\n\nThis sample is maintained by Google with the help of Google Developer Experts.\n\nNext steps\n----------\n\n- [Custom functions in Google Sheets](/apps-script/guides/sheets/functions)\n- [Extending Google Sheets](/apps-script/guides/sheets)"]]