[brianmontgomery2000]

Yes, if the practice green is representative of the greens on the course (if not I will base it off of the first green I putt on).
On a level medium fast green from six feet for example I will use a 3 inch backstroke and 3 inch follow through. This would hold true for all level putts. This becomes a baseline to work from (for example a severe downhill putt of 20' might be struck like the level 6' putt). In other words you would subtract for the downhill and add for the uphill. You could also factor in grain or moisture or grass type. The real key to this working is to have a pace to the stroke that is consistent. As green speeds change from course to course you can adjust your formula.
I have had countless students who had zero distance control and averaged beyond 36 putts per round to averaging 30 putts and below per round, using this system.

The number of inches backstroke technique was troublesome to me several years ago. Completely destroyed my feel. I then ended up with the other extreme where I essentially put zero objective data into the equation. My current pacing off with then a pressure to correlate is my plan to strike the right balance of feel and objective info.