Sometime back, I calibrated the oil dipstick for my truck:
When you find a suitable dipstick, calibrate it for your application... at oil change time, add 5 quarts with new filter, push the dipstick in all the way and then carefully remove. With a clean hand file, cut a mark [small line] across the back of the dipstick at the highest point of the oil. That mark will indicate being 1 quart low. Next, carefully clean the dipstick and then return it to the engine. Add the 6th quart and run the engine and then shut off. After the oil has drained back to the crankcase, check the oil and once again, use the file to mark "full."