100=Top.
99=0.25
98=0.5
97=0.75
96=1.0
95=1.25
94=1.5
93=1.75
92=2.0
91=2.25
90=2.5
89=2.75
88=3.0.

Basically every 4 points from the top down = 1.0 lengths.
That's the scale i have always used with them others may be different.

These are for Skyform ratings i have never used,
100 pointers on Unitab as to many horses are rated,
On the same rating sometimes and way to close together,
For me to make heads or tails of, others may have a formula for them.

Cheers.
Garyf.