# Specify Calculation dialog box

This dialog box appears so that you can build a formula for a calculation or calculated field.

- If necessary, for
**Evaluate this calculation from the context of**, choose a table from the list.Setting the context for a calculation is only necessary when you're creating a calculation field in a source table that has two or more occurrences in the relationships graph. The choice you make may affect the calculation results, particularly if your calculation will include fields in related tables.

For more information on the use of context in calculations, see Choosing the evaluation context for a calculation field.

- Build a formula for your calculation using field references, operators, constant values, and functions.
In the calculation pane, click where you want the item to appear, then:

- Begin typing the field's table, choose the table from the list, begin typing the field name, then choose the field name from the list the appears.
- In the fields pane, double-click the field name. To display field names from a different table, choose the table from the tables list.
- Type an operator.
- Click an operator in the list to the right of the calculation pane.
- Begin typing the function name, then choose a function name from the list that appears.
- In the functions pane, double-click the function.
- Specify calculation options for the field.
- To select indexing and storage options for the field, click
**Storage Options**, then choose options in the Storage Options dialog box.See Defining field indexing options and Defining global fields (fields with global storage).

To add |
Do this |

A reference to a field |
Do one of the following: |

An operator or an exponent |
Do one of the following: See Comparison operators, Logical operators, Mathematical operators, and Text operators. |

A constant value |
Type the value. |

A function |
Do one of the following: In the calculation pane, replace the placeholder parameter with a value or expression. |

To |
Do this |

Set the field type of the result |
Choose a data type for Choose the correct type for the result you want. See About choosing a field type. |

Make a calculated field repeating |
For |

Prevent calculation if all referenced fields are empty |
Select When enabled, FileMaker Pro does not evaluate a calculation if all fields used by the calculation are empty. This typically improves performance. |

**Important **To avoid confusion when using dates in FileMaker Pro, always define calculation formulas to enter four-digit years. See Entering dates with two-digit years.

## Notes

- To show or hide the functions pane, click .
- To filter the list of fields or functions in the fields pane or the functions pane, type the field name or function name in the search box.
- To change the way fields or functions are displayed in the fields pane or the functions pane, click .
- To view information about a function, click the function in the functions pane. A description appears below the list. To view more information, click .