In Charles Carroll's book, Speed Handicapping, he set up a table of multipliers to adjust for each different distance. I don't agree with the adjustment values in the book, but I have found that the general principle works reasonably well. If you want to take a deeper dive, you could have tables for each track.
But keep in mind that this methodology is just a means of comparing various distances. It is not predictive of a particular horse's ability to change to a new distance.
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