Board Thread:The Quarters - Q & A/@comment-2001:708:30:1020:F104:2EB5:6348:426-20190108190615/@comment-25085701-20190108223006

The base damage is based off of the task's effective new value, multiplied by the difficulty of the task (0.1 for Trivial, 1.0 for Easy,  1.5 for Medium, and 2 for Hard), multiplied by 0.5% of your Strength. For exact hard numbers, though, the best way is to use the Data_Display_Tool which shows you exactly how much damage you do on a click.