From a speaker manufacturer now out of business, I learned to measure the center of the woofer to the floor and multiply that time 1.6. This is the distance to the side or back wall. This then is multiplied by 1.6 and that is the distance to the other. This is NOT likely to be pleasing to others in your life.
Best Speaker Placement Rules you've used?
Thought a thread like this might be interesting. What have you found to be the best rules for speaker placement? Either in your own system and room or one that has worked for you in many.