1-1/8 & 1-1/4 front sway bar vs factory 7/8?

So im having a hard time understanding, i found a sway bar spring rate calculator and assuming all lengths are the same, a 1-1/8 solid bar will be 1.75 times stiffer than a 7/8 solid bar. And the 1-1/4 tubular bar at .25” wall thickness (guess) will only be 1.5 times stiffer. Is this true? But then i saw a video where a 1-3/8 hollow bar had more stiffness than a 1-1/4 solid bar.

From hotchkis: “a 1’3/8″ hollow bar is equivalent to a 1’1/4″ solid. But the 1’3/8″ hollow bar is 6% stiffer and 43% lighter than the 1’1/4″ solid.” So a 1-1/4 hollow would be equivalent to a 1-1/8 solid but be slightly stiffer and lighter?

Im about to just go the solid 1-1/8 bar route and say screw it lol

Not even sure how accurate the calculator is

I appreciate everyones input and thanks for being patient with my questions.

Also according to summit the hellwig 1-1/8 tubular bar is curently discontinued and the 1-1/4 tubular bar is being discontinued with none in stock, the 1-1/8 bar is available, so are they limiting it down to only one option on the front? Im just concerned about it being too stiff if its even possible with .870 bars

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