Here is the way I would go about it, using simple common sense and some old school math ..
Is the pan 4 quarts or 6 ................ ready for the formula ?
Pour in the proper amount ........ the pans capacity. Go play a video game or watch some TV, and allow all the oil to settle / drain into the pan, heck wait a day to make sure all your oil molecules are present .
After waiting the proper amount of drain time, insert the dip stick . Remove and observe the oil level. Go too the work bench , note the location of the oil now mark the stick, exactly where you see the oil and the clean area meet... will need something other then a sharpie for the marking process ..