# Enter a formula

Formulas are equations that perform calculations on values in your sheet. All formulas begin with an equal sign (=). You can create a simple formula by using constant (constant: A cell value that doesn't start with an equal sign (=). For example, the date 10/9/96, the number 210, and the text "Quarterly Earnings." A formula or a value that results from a formula is not a constant.) and calculation operator (operator: A sign or symbol that specifies the kind of calculation — such as addition, subtraction, or multiplication — to be performed on the elements of a formula. Operators include mathematical operators; comparison, or logical, operators, which compare two values and produce the value TRUE or FALSE. The text operator & (ampersand), which concatenates two pieces of text into a single combined text value; and reference operators, which produce one reference to a cell or range of cells from two references.). For example, the formula **=5+2*3**, multiplies two numbers and then adds a number to the result.

When you want to refer to variables instead of constants, you can use cell values, for example, **=A1+A2**. If you are working with long columns of data, or data that is located in different parts of a sheet or on another sheet, you can use a range (range: Two or more cells on a sheet. The cells in a range can be adjacent or nonadjacent.) —for example, **=SUM(A1:A100)/SUM(B1:B100)**, which represents the division of the sum of the first hundred numbers in column A by the sum of those numbers in column B. When your formula refers to other cells, any time that you change the data in any of the cells Excel recalculates the results automatically.

You can also create a formula by using a function, a predefined formula that simplifies entering calculations.

**Equal signs** start all formulas.

**Constants**, such as numbers or text values, can be entered directly into a formula.

**Operators** specify the kind of calculation that the formula performs. For example, the ^ (caret) operator raises a number to a power, and the * (asterisk) operator multiplies numbers.

**Functions** are premade formulas that can be used alone, or as part of a longer formula. Each function has a specific argument syntax.

**Cell values** let you to reference an Excel cell, instead of the specific value inside the cell so that the contents of the cell can change without the function that refers to the cell having to change.

Do any of the following:

Enter a formula that refers to values in other cells

- In a sheet that contains columns of numbers, click the cell where you want the formula results to appear.
- Type an equal sign
.**=** - Click the first cell that you want to include in your calculation.

- Type an operator, for example,
.**/** - Click the next cell that you want to include in your calculation.

- Press RETURN .

The result of the calculation appears in the cell.

** Tip ** To quickly apply a formula to the next cells down in the column, double-click the fill handle (fill handle: The lower-right corner of the selection. When you hold the pointer over the fill handle, the pointer changes to indicate that it is selected. You can copy contents to adjacent cells or fill in a series, such as dates, by dragging the fill handle.) on the first cell that contains the formula. Excel calculates the results in each cell of the column automatically.

Enter a formula that contains a function

Functions are predefined formulas that simplify manual entry and help you perform complex operations. For example, you can use a function such as SUM to total all the values in a column or MIN to find the smallest number in a range of cells.

- In a sheet that contains a range of numbers, click the empty cell where you want the formula results to appear.
- Type an equal sign and a function, for example
**=MIN**. - Type an opening parenthesis, select the range of cells that you want to include in the formula, and then type a closing parenthesis.

- Press RETURN .

In our example, the MIN function returns **11**, the smallest number in cells A1 through C5.

### See also

Add a list of numbers in a column

Calculation operators and order of operations