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The LET formula allows you to create variables in a formula and define their value before using them. This can make complex formulas easier to read and maintain by breaking them into smaller parts. It is most commonly used in combination with other formulas to simplify complex formulas.


Use the LET formula with the syntax shown below, it has 3 required parameters and 2 optional parameters:

=LET(name1, value_expression1, [name2, ...], [value_expression2, ...], formula_expression )
  1. name1 (required):
    The name of the first variable to create.
  2. value_expression1 (required):
    The expression that defines the value of the first variable.
  3. name2 (optional):
    The name of any additional variables to create.
  4. value_expression2 (optional):
    The expression that defines the value of any additional variables.
  5. formula_expression (required):
    The formula expression that uses the previously defined variables.


Here are a few example use cases that explain how to use the LET formula in Google Sheets.

Simplifying complex formulas

By breaking a complex formula into smaller parts using LET, you can make it easier to read and maintain.

Reducing formula errors

Using LET to define variables can reduce the likelihood of formula errors by making it easier to keep track of each part of a complex formula.

Nesting formulas

You can use LET to nest formulas inside each other, creating a hierarchy of variables and formulas that can be easier to understand and debug.

Common Mistakes

LET not working? Here are some common mistakes people make when using the LET Google Sheets Formula:

Not using the correct syntax

Make sure you follow the correct syntax for LET when defining variables and using them in your formula.

Forgetting to close parentheses or quotes

Make sure you close all parentheses and quotes in your formula, as leaving them open can cause errors.

Using the wrong variable name

Double-check that you are using the correct variable name in your formula expression.

The following functions are similar to LET or are often used with it in a formula:

  • IF

    The IF formula is a logical function used to test a condition and return one value if the condition is true and another value if the condition is false. It is commonly used to create conditional statements and perform calculations based on certain conditions.

  • AND

    The AND function in Google Sheets is a logical function that returns TRUE if all of the logical expressions in the argument are TRUE, and FALSE if any of the logical expressions are FALSE. It can be used to test multiple conditions and evaluate whether they are all true or not.

  • OR

    The OR formula is a logical formula that returns TRUE if at least one of the provided logical expressions is TRUE. It returns FALSE if all logical expressions are FALSE. This formula is commonly used in conjunction with other logical formulas, such as AND, to build more complex logical statements.

  • SUM

    The SUM function in Google Sheets adds up a range of numbers. This function is most commonly used to sum the values in a range of cells.


    The AVERAGE function calculates the average (arithmetic mean) of the values passed to it. It is commonly used to find the average of a range of cells containing numerical data.

Learn More

You can learn more about the LET Google Sheets function on Google Support.