Google Sheets | LET | Function | Can Calculate Faster | Example | How to | Spreadsheet | Tutorial

With the Google Sheets LET function, you can use a name as an argument and assign it a value expression, formula expression, or both. Some of the advantages of LET function are it can calculate faster because the value expression is calculated only once, even if name is used many times, and the name argument can make it easier to understand the formula.
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Syntax of LET Formula
=LET(name1, value_expression1, [name2, …], [value_expression2, …], formula_expression )
Start the formula with an equal-to symbol
LET is the name of the function.
name1 is a variable to which value_expression is assigned.
value_expression is a formula whose result is assigned to name1.
name2, value_expression2 are optional.
formula_expression is a formula which uses name1.
Examples of LET Function Formula
Example 1
=LET(amount, SUM(A2:A12), tax, 12%, amount+tax)
The result of adding numbers in the range A2 to A12 is assigned to the name amount. The name, tax, is assigned 12%. The formula expression is amount+tax. LET returns the sum of amount and 12%.
Example 2
This example uses the functions IFS and LET to accomplish the same task.
=IFS(sum(B4:E4)[insert greater than symbol]=800,"Target met", SUM(B4:E4)[insert greater than symbol]=700, "Partial", SUM(B4:E4)[insert less than symbol]700, "No")
Note that this formula uses the SUM function three times, which means redundancy.
Further, in a large data range, the calculation may take more time.
=LET(total_sales, SUM(B4:E4), IFS(total_sales[insert greater than symbol]=800,"Target met", total_sales[insert greater than symbol]=700, "Partial", total_sales[insert less than symbol]700, "No"))
Here the result of sum of numbers in the range B4 to E4 is assigned to the name total_sales. Even though total_sales is used three times in the formula, the SUM function is evaluated only once. Also, the name total_sales makes the formula easier to understand.
Take a look at this video tutorial, which gives the steps to use the Google Sheets LET with examples.