How to convert the result of a test, TRUE or FALSE, by the value 1 and 0
Basic logical test in Excel
In Excel, any logical test returns TRUE or FALSE.
For instance, to compare the contents of 2 columns, you have to write the following test.
=A2=B2

In this second example, we want to know if our customer has 21 years old or more. So we create the following test with an absolute reference to the limit cell.
=B2>=$G$4

How to convert the test to a numeric value?
So when you create a test in Excel, the result is TRUE or FALSE by default.
Tips 💡The result of a logical test is always displayed in the center of the cell, ALWAYS 😉
But, you can convert TRUE or FALSE to 1 or 0 with 2 different method
Method 1: Multiply by 1
The first method is to multiply the logical test by 1
=(logical test)*1

You can see in column D the formula used
Method 2: Write 2 dashes
The other technique is to write 2 dashes before the test like in this example.
=--(logical test)

And the result is the same; the test returns 0 or 1.