Excel provides two types of array formulas: Array formulas that perform several calculations to generate a single result and array formulas that calculate multiple results.

Excel formulas that return a set of values, also known as an array, return these values to neighboring cells. This behavior is called spilling. Formulas that can return arrays of variable size are called …

When you enter an array formula, you most often use a range of cells in your worksheet, but you don't have to. You can also use array constants, values you just enter in the formula bar inside braces: {}.

Generally speaking, functions that return multi-cell ranges or arrays will be prefixed with @ if they were authored in an older version of Excel. It's important to note that there is no change to the way your …

Spilled array formulas aren't supported in Excel tables. Try moving your formula out of the table, or converting the table to a range (select Table Design > Tools > Convert to range).

Custom functions that refer to more than 10,000 cells cannot be calculated in Excel for the web, and will produce this #CALC! error instead. To fix, open the file in a desktop version of Excel.

The XLOOKUP function searches a range or an array, and then returns the item corresponding to the first match it finds. If no match exists, then XLOOKUP can return the closest (approximate) match.

To change or edit an array formula, you need to follow some rules, especially if you have multi-cell formulas. This article spells out the rules.

The FREQUENCY function calculates how often values occur within a range of values, and then returns a vertical array of numbers. For example, use FREQUENCY to count the number of test scores that …

If you need to use ranges that are located on different sheets from each other, it is recommended that you use the array form of the INDEX function, and use another function to calculate the range that …