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So now we know that 1lb/in = .017857967322834645669291338582677.
So if we want a spring that's roughly 560lbs; we'd multiply both sides by 560, and come up with roughly a 10k spring rate. Alternatively if you already know the kg/mm rate and want to find out what the lbs/in is, just divide the spring rate by that reaaally long factoral above (the .0178...).
But just in case you all didn't want to go through all that, here's a chart: