You have the ability to perform calculations on certain text field elements on a SeamlessDoc. To do so, first select a text field, after which the Option Menu Toolbar will appear. One of the icons on the toolbar will be a calculator.

Clicking it will bring down the calculations panel and your text field elements will have a corresponding cell letter and number (something along the lines of "F25"). This can be used to reference a specific text field for your calculations, as shown below.

The functions that can be used in your calculations are the same functions you are familiar with when using Microsoft Excel or Google Spreadsheets. For a full list of supported functions, please click here.