What?
A simple calculator is a available inside TAD to do quick calculations. It has a few more subtle features as listed below:

1. You can use variables x1, x2 etc to represent the current value that is displayed on the line number of the Information Pane. Usually x0 and x1 cannot be used as they are not actual values. (Usually the first two items in the information pane would be the name and class of the current object)
2. You can use sqrt(…) and the caret ^ for power