How to Delete a Formula
If you no longer need a formula in your calculator, you can delete it by:
- Click any result to open the Calculated Result popup

 - Open the Select a Formula drop-down and select the formula you'd like to delete

 - Click the pencil icon to edit the formula

 - Click the trash can icon to delete the formula

 - Click Delete Formula

 
Warning: Once a formula is deleted, it's impossible to recover. So, you would need to create the formula again from scratch.