deadlift vs squat max

can u predict ur squat max using ur deadlift max

No. Not to a reasonable degree of accuracy. Short question, short answer.

u should be able to est, bc if someone deadlift 600lbs they should be able to squat at least 450-500.

If you compare bodyweights of high end powerlifters the heavier lifters squat more than DL. With the advent of various suits, it has distorted (maybe not the best word) the numbers. Way to many factors to simply predict.

Well you can estimate, but with a margin of error of 100 pounds or more sometimes, what good is that? There are just to many factors (depth, stance, quad/p chain strength, levers).

I don’t think there is any way you can do it accurately.