If you’re an Excel power user, you likely have go-to formulas that you use again and again. If only there was a way to turn those formulas into stand-alone functions, or even custom functions! Well, there is! In this post, I’ll teach you how to use the LAMBDA() function in Excel to take your complex formulas and make them available as custom functions you can use anywhere in your workbook.

**Introduction**

Are you struggling with using complex formulas in Excel? Do you find yourself wishing there was an easier way to do things? Well, there is! Using LAMBDA() in Excel, you can create custom functions that make your life a whole lot easier. What does this mean? It means that instead of spending hours figuring out how to use a formula or trying to remember all the different ways it could be used, you can simply create one function and call it up whenever you need it. If you are new to writing Excel functions, here are a few tips for creating LAMBDA() in Excel:

1) Create two columns next to each other on your spreadsheet. In column A enter the letters a through d. In column B enter any text for what the corresponding letter will represent. For example, if column A contains a, then in column B enter x+y. You now have four cells set up for calculation purposes: x+y (in cell B2), a*b (in cell C2), c/d (in cell D2), and e^f (in cell E2).

2) Click on Insert Function from the Ribbon menu at the top of your screen.

3) Type =LAMBDA(A1;B1;C1;D1;E1) and press Enter.

4) To see the results of the calculation, hover over any cell containing =LAMBDA in Column A and select Show Result from the drop down menu that appears.

5) Your cursor should now be flashing inside a black box where you want to input the variables for which you want to calculate values.

6) Enter whatever numbers correspond with those variables, separated by commas, as follows: =a+x+y (the first argument is letter a, so input number six in Cell C6), =AVERAGE(c5:c8)=d5:d8=e5:e8 (last argument is letter e, so input number eight in Cell F8).

7) Finally, click OK to complete the process.

8) Congratulations! You just created your very own custom function using LAMBDA() in Excel.

**What Is A Function?**

A function is a set of instructions that takes one or more input values and produces an output value. Functions can be written in any programming language, but they are commonly used in spreadsheet applications like Microsoft Excel. There are many different types of functions you can use with Excel, from built-in ones like SUM(), to more complicated functions such as IF(), OR(), and LAMBDA().

The IF() function is very useful when there is a need for conditional logic.

The IF() statement includes three arguments: the condition being tested (A), the desired result if the condition tests true (B), and the desired result if the condition tests false (C). If you wanted your formula to return B if x=1, C if x=2, D if x=3, then your formula would look like this: =IF(x=1,B,C,D)

This returns D because x=3 evaluates to false in this case. Similarly, the OR() function allows you to test multiple conditions simultaneously by using four arguments: first two arguments representing conditions which should both be true for it to evaluate as true; last two represent conditions which should both be false for it to evaluate as false.

For example, if we want our formula to return B if x=1 or 2, and C if x=3 or 4, then our equation looks like this: =OR(x=1 AND x<>2;x=3 AND x<>4;B;C) This will return C because 3 OR 4 evaluates to TRUE, meaning both 3 and 4 have been evaluated as true. In contrast, evaluating FALSE means that none of the expressions were true. LAMBDA() can help us do just that! It allows us to define a simple expression that gets executed whenever an argument changes in our original formula—similar to how we’ve used IF() and OR().

In fact, you might notice that LAMBDA() also uses three arguments: first argument represents the variable which has changed; second argument is the new value given to that variable; third argument specifies what needs to happen based on whether the variable’s old and new values are equal or not.

Let’s see how it works by taking a look at this hypothetical problem of saving money for retirement. We want $100 dollars per month deposited into an account starting today, with compounding interest so that after ten years, our total savings equals $10,000 dollars. We could solve this problem manually, but it’s much easier if we let Excel do all the heavy lifting!

**Why Use Functions?**

Functions are written in VBA and can be used to automate repetitive tasks, perform calculations, and return information that would otherwise be difficult or impossible to obtain. In addition, functions can be stored in worksheets and called from macros, making them an essential tool for streamlining workflows. By using LAMBDA(), you can create custom functions that are tailored to your specific needs. The syntax of the function is as follows: =LAMBDA( argument_list ).

The argument list includes a variable number of arguments which are separated by commas. The first argument is always the name of the function; any subsequent arguments depend on what type of function it is.

**The Syntax of Functions**

You can use the LAMBDA function in Excel to create custom functions. The syntax of the LAMBDA function is as follows: =LAMBDA(input1, input2, … , output). The inputs and outputs can be any data type. The LAMBDA function can have multiple inputs and outputs.

To use the LAMBDA function, you first need to create a named range. To do this, select a cell, then click the Name box (the box to the left of the formula bar), and type a name for the range.

After you create the named range, you can use it like any other function in Excel.

** ****LAMBDA() Example 1 – Single Statement**

You can use LAMBDA() to create a custom function in Excel that will take one or more arguments. For example, the following formula will take two arguments (A1 and A2) and return the sum of those two values. The argument x is not necessary for this function but it does show how you could pass in any number of arguments depending on your needs. The result of this function would be 12.

To make this easier to read we can change the input cells and output cell so they are consistent with our custom function

If we change A1 = 5 and A2 = 10 then the result would be 25.

Here is what our spreadsheet should look like now . Notice that all of the inputs are connected to the outputs using an arrow.

We still need a way to enter an equation if there is no value in either cell because our current equation only works when both inputs are present. We can do this by adding an if statement as shown below: If there is no value in either input then nothing happens and the other cells don’t change.

When there is a value entered in either input, then it calculates the sum of those two numbers and changes the other cells accordingly. So entering 2 in A1 while leaving A2 blank will cause 5+10=15 to appear in B1; otherwise, if we enter something into both inputs, it’ll calculate 3+8=11 which appears in B1.

This type of formula might be useful for calculating commissions where employees earn different rates based on sales volume during their shift.

** ****LAMBDA() Example 2 – Multiple Statements/Arguments**

If you have a more complex formula that requires multiple statements or arguments, you can use LAMBDA to create a custom function for it. For example, let’s say you want to create a function that multiplies two numbers and then adds 10 to the result. You could use the following LAMBDA statement: =LAMBDA(A1*A2+10) to achieve this goal. In this case, LAMBDA takes two arguments – A1 and A2 – and assigns them values before adding 10 to the result. Since these are both whole numbers, there is no need to convert the results back to an integer. The end result is simply 30 instead of 30.0 as with our previous example.

If you had an argument that required an additional calculation on its own, such as A3=SQRT(100), then you would need to make sure your entire statement was inside of parentheses. Doing so would force Excel to perform all calculations from left-to-right before returning a value back from LAMBDA(). As an example, consider the following formula: =LAMBDA((5*6)+8). First, Excel performs 5*6 which equals 30; then it performs 8+30 (which equals 38). Finally, it returns 38 as the final answer.

**More Information On Functions In Excel**

Custom functions are a great way to streamline complex formulas in Excel. By using the LAMBDA() function, you can create custom functions that can be used over and over again. Plus, LAMBDA() makes it easy to share your custom functions with others. Here’s a step-by-step guide on how to use LAMBDA() to create custom functions in Excel.

1) Select an area of cells or range where you want to store your custom function.

2) Choose Insert > Function > More Functions > Math & Trig > LAMBDA

3) In the Function name field, type in what you want the name of your new function to be (such as SUMIFS).

4) In the Function arguments field, enter what parameters need to be entered for this new function (such as SUMIFS(Range(A1), Range(A2), Range(A3)).

5) Click OK and then press CTRL+SHIFT+ENTER when prompted by Excel if you want to copy the formula down through all rows or columns within the selected range.

6) Congratulations!