3.14 x diameter will give the distance around the tire, but the chain side links and distance that the cross links cover are what's important and this is what people usually measure when the chain set is laid on a flat surface. I've looked for a chart too, and haven't had any luck.
One site that shows what chains will fit what tires sizes is;
But, it doesn't state what un-installed length is.
There's a topic (video) on there on how to determine the size of chain needed if the size you have is not on the charts, however, it only goes as far as having you measure the tire and submit the dimensions to them...doesn't tell you what actual length is needed.
Just guessing with what they are asking, that the length of the chain set is a factor of those dimensions and through some algorithm, they determine the overall length.
They also have a video showing how to install the chains, with steps showing how to shorten the sides.... so, the length they'll provide is more than likely purposely too long as they'd not want to ship you chains that are too short.
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Al
