You can access a calculator within Toad data grids. To use the calculator, the table must be editable. Understand Editable Resultsets
To access the calculator
Toad enables you to view, add, modify, and get information about database objects. You can work with these objects quickly and without having to use SQL commands.
You can use the Describe Objects feature anywhere in Toad to find objects and display their information in the Describe Objects window. The Describe Objects window displays the same information you would see in the right-hand side of the Schema Browser.
Note: You can describe many objects types through database links. However, the following object types are not supported: policy, policy group, java, refresh group, resource groups/plans, sys privs, and transformations.
To immediately describe the object
Select the object and press F4.
Tip: You can also right-click the object and select Describe.
To specify the object schema and name before describing the object