If I may
Here is a simple way to use a simple piece of crap calculator next to you while playing. No Excel, wind calculators etc. those all take time. On a 30 second clock you have very little time to use the simple stuff I am going to show you.
Every one has had some pertinent info in this thread that helps them, their way.
This is useful for all greens at level or slightly pitched to 3 feet + or -
the flag reads 28 feet out, with a 3 inch up slope
Add 28 + 3 = 31,,, this you do all the time. Starting at champs and going down, the formula is as such
Champ greens with above calculation, 31 x.65 gets you right at the cup
Tournement 12 = x .7
T 11 = x .75
very fast = x .8
fast = .85
standard = .9
slow = .95
very slow = 1.1
that being said, I have a Nike level 71 ball that adds a bit of extra oomph when I hit it.
As the preceding folks have all said, there are variables that you will have to look for playing your equipment. The larger uphills, add a couple feet, the big downhills subtract a couple feet, some times more on evil slopes.
The formula I have given is simple to use from any yardages away, not ten feet etc.
Big breaks require finesse, good judgement, and practice.
good luck