Distance control for when the green speed is one you're not used to playing on:
Very Slow: 80%
Slow: 90%
Standard: 100%
Fast: 110%
Very Fast: 120%
Tournament: 130%
Now, what you do is divide the percentage given here for the green speed you're playing by the distance you have to the pin plus or minus the adjustment for elevation, and that's what you have to hit.
Example: Pro's play fast green speed. Say we have a 20 foot putt that's 3 inches uphill. 23 ft of power, but wait! Fast greens mean putts roll 110%, so divide the 23 ft by 1.1. for the less math abled, that's 20.9 feet.