How to Use the LET Function in Excel

Introduction

The “LET” function is a valuable feature in both Excel and Google Sheets that allows users to assign names to calculation results. This capability enables the declaration of variables and the definition of expressions that can be reused within a formula. Utilizing the LET function enhances formula readability, simplifies formula management, and improves computation efficiency.

Basic Syntax

The syntax for the LET function is consistent across both Excel and Google Sheets:

LET(name, value, calculation)

• name: The identifier for the variable.
• value: The value assigned to the variable.
• calculation: The formula in which the declared variable will be used.

Examples of Using LET Function

Example 1: Calculate the Area of a Rectangle

Consider needing to calculate the area of a rectangle given its length and width. Here’s how you can apply the LET function:

The formula using the LET function is given as:

=LET(length, 10, width, 5, LET(area, length * width, area))

Example 2: Calculate Total Salary with Bonus

Imagine you need to calculate the total salary for an employee, accounting for their base salary and a bonus percentage. Here’s the scenario:

The formula applying the LET function would look like this:

=LET(base_salary, 5000, bonus_percentage, 0.1, LET(total_salary, base_salary * (1 + bonus_percentage), total_salary))

Conclusion

The LET function in Excel and Google Sheets serves as an efficient tool for defining variables and streamlining complex formulas. It not only enhances the legibility and manageability of your spreadsheets but also optimizes the calculation processes essential for effective data management.

More information: https://support.microsoft.com/en-us/office/let-function-34842dd8-b92b-4d3f-b325-b8b8f9908999