# Define Calculations - the Account Definition Tab

Here you define the calculation account formula, which
is then processed from the Calculate Fast Formulas function. Calculation
accounts are defined in Define Account Structures.

## Procedure

- On the Reports menu, select Define Calculations. The Define Calculations window opens.
- On the Account Definition tab, in the Variable column, enter a variable code, for example INV.
- In the Name - Group and Name - Local columns, enter a description of the variable or formula. For example, Equity + Long Term Liability for the variable INV.
- In the Formula column, enter the account or mathematical formula expressed in variables or accounts, where accounts are preceded by a #, for example #290 + #230. You can use +, -, *, / and ( ). You can also click the empty column preceding the Formula column to open a list of available accounts. Select the relevant account and click OK. Place the cursor in the Formula column and press Ctrl+V to paste the copied account. The account is displayed with a # mark in front of it. If you enter accounts manually, all account numbers must be preceded by a # mark. Accounts and variables can only be added or subtracted with each other, not multiplied or divided.
- Click Save and open the Period Definitions tab.