Very easy. See Set Variable to Calculation action.
Getting Started with Keyboard Maestro
- Read the Quick Start.
- This is essential to become familiar with KM terminology
- Do the tutorial (Help ➤ Tutorial) in the KM Editor.
- Gives you a live walkthrough of creating a macro in the KM Editor
- Review/Browse the Available Macro Actions
- For Help with an Action in your Macro, click on the gear icon
at the top right of the Action, and select "Help" - Search the Keyboard Maestro Wiki for detailed help.
- Start small, and grow your macros organically.
- Be prepared for some trial and error in the beginning.
- Make good use of this Keyboard Maestro Forum
- Checkout these Great Resources
- Search for existing macros
- Post your questions/issues if you get stuck
- Be sure to first read: Tip: How Do I Get The Best Answer in the Shortest Time?
For more help, see Getting Started with Keyboard Maestro and the Forum .